Maro Publications

2011 Polyethylene Journal Articles

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11/23/2011**

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Polyethylene Journal Articles Updates

 

Week 46 11/14 through 11/18

Week 45 11/8 through 11/12

Week 44 10/31 through 11/4

Week 43 10/24 through 10/28

Week 42 10/17 through 10/21

Week 41 10/10 through 10/14

Week 40 10/3 through 10/7

September 2011

August

July

June

May

April

March

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Week 46 11/14 - 11/18

Friday 11/18/2011

Easily accessible oxygen-containing derivatives of niobium pentachloride as catalytic precursors for ethylene polymerization
(1722–1727)
Polymer International 60 #12 (2011)

Preparation and flame retardancy of a novel flame-retardant poly(ethylene-co-vinyl acetate)/aluminum hydroxide composites containing phosphorus
(1970–1978)
Polymer Composites 32 #12 (2011)

Properties of carbon nanotube reinforced linear low density polyethylene nanocomposites fabricated by cryogenic ball-milling
(2101–2109)
Polymer Composites 32 #12 (2011)

Thursday 11/17/2011

Ferrous and cobaltous chloride complexes bearing 2-(1-(arylimino)methyl)-8-(1H-benzimidazol-2-yl)quinolines: Synthesis, characterization and catalytic behavior in ethylene polymerization
(5803-5810) Polymer 52 #25 (2011)

Molecular weight scaling of the spherulite growth rate in isothermally melt crystallized polyethylene nanocomposites
(5851-5857) Polymer 52 #25 (2011)

Solid-State Structure and Crystallization in Double-Crystalline Diblock Copolymers of Linear Polyethylene and Hydrogenated Polynorbornene
(8835–8844)
Macromolecules 44 #22 (2011)

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Week 45 11/7 - 11/11

Friday 11/11/2011

Oxygen Barrier Properties of New Thermoplastic Natural Rubber Nanocomposites
(1564-1569)
Polymer - Plastics Technology and Engineering 50 #15 (2011)
Abstract

Study on Immobilized Metallocene and Single-Site Catalysts for the Preparation of Ultra-High Molecular Weight Polyethylene at Various Polymerization Conditions
(1557-1563)
Polymer - Plastics Technology and Engineering 50 #15 (2011)
Abstract

Aging of HDPE Pipes Exposed to Diesel Lubricant
(1594-1599)
Polymer - Plastics Technology and Engineering 50 #15 (2011)
Abstract

Thursday 11/10/2011

Elongation properties of polyethylene melts
(2490–2494)
Polymer  Engineering &  Science 51 #12 (2011)

Ultradrawing properties of ultrahigh-molecular weight polyethylene/functionalized carbon nanotube fibers and transmittance properties of their gel solutions
(2552–2563)
Polymer  Engineering &  Science 51 #12 (2011)

Effects of organic–inorganic hybrid coatings on durability of cross-linked polyethylene
(2080-2087) Polymer Degradation and Stability 96 #12 (2011)

Analysis of photo-chemical degradation behaviour of polyethylene mulching film with pro-oxidants
(2237-2252) Polymer Degradation and Stability 96 #12 (2011)

Protein adsorption of radiation functionalized LDPE sheets
(1837-1848)
Polymer Bulletin 67 #9 (2011)

Study on properties of nanocomposites based on HDPE, LDPE, PP, PVC, wood and clay
(1875-1892)
Polymer Bulletin 67 #9 (2011)

Correlation between entry pressure losses and elongation viscosity of polyethylene melts
(1935-1944)
Polymer Bulletin 67 #9 (2011)

Viscoelastic, thermal, and morphological analysis of HDPE/EVA/CaCO3 ternary blends
(1961-1978)
Polymer Bulletin 67 #9 (2011)

Effects of Ti oxidation state on ethylene, 1-hexene comonomer polymerization by MgCl2-supported Ziegler–Natta catalysts
(1979-1989)
Polymer Bulletin 67 #9 (2011)

Flammability and Thermal Characteristics of Alkaline Aqueous Solution Treated Groundnut Shell–HDPE Composites
(875-888)
Journal of Thermoplastic Composite Materials 24 #6 (2011)
Abstract

Wednesday 11/9/2011

The Influence of Injection Molding and Injection Compression Molding on Ultra-high Molecular Weight Polyethylene Polymer Microfabrication
(508-516)  
International Polymer Processing #5 (2011

The Influence of Melt and Process Parameters on the Quality and Occurrence of Part Defects in Water-assisted Injection Molded Tubes
(551-559)  
International Polymer Processing #5 (2011)

Effects of Nonsolvent Molecular Structure and Its Content on the Formation of the Macroporous Polyarylate Layer Coated onto the Polyethylene Separator
(12596–12605)
Industrial & Engineering Chemistry Research 50 #22 (2011)

Morphology and mechanical property of high-density polyethylene parts prepared by gas-assisted injection molding
(1661-1671)
Colloid and Polymer Science 289 #15-16 (2011)

Tuesday 11/8/2011

Flow accelerates adhesion between functional polyethylene and polyurethane
(3496–3506)
AIChE Journal 57 #12 (2011)

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Week 44 10/31 through 11/4

Thursday, 11/3/2011

Enhancement of strain-hardening by thermo-oxidative degradation of low-density polyethylene
(519-535)
Rheologica Acta 50  #5-6 (2011)

Thermorheological behavior of polyethylene: a sensitive probe to molecular structure
(559-575)
Rheologica Acta 50  #5-6 (2011)

Wednesday, 11/2/2011 

Dielectric behavior of alternating ethylene, propylene, and carbon monoxide co- and terpolymers via impedance spectroscopy
(2020–2026)
Journal of Applied Polymer  Science 123 #4 (2012)

Glass fiber/wood flour modified high density polyethylene composites
(2084–2089)
Journal of Applied Polymer  Science 123 #4 (2012)

Effect of bark flour on melt rheological behavior of high density polyethylene
(2122–2130)
Journal of Applied Polymer  Science 123 #4 (2012)

Positive temperature coefficient effect and interaction based on low-density polyethylene/graphite powder composites
(2338–2343)
Journal of Applied Polymer  Science 123 #4 (2012)

Lamellar arrangements of linear polyethylene in ultrathin films
(2558–2565)
Journal of Applied Polymer  Science 123 #4 (2012)

Tuesday, 11/1/2011 

Effect of surface treatment on the physicomechanical and thermal properties of high-density polyethylene/olive husk flour composites
(1310–1319)
Journal of Applied Polymer  Science 123 #3 (2012)

Synthesis and characterization of linear low-density polyethylene/sepiolite nanocomposites
(1718–1723)
Journal of Applied Polymer  Science 123 #3 (2012)

Morphology and properties of nylon 6 and high density polyethylene blends in presence of nanoclay and PE-g-MA
(1801–1811)
Journal of Applied Polymer  Science 123 #3 (2012)

A supported titanium postmetallocene catalyst: Effect of selected conditions on ethylene polymerization
(1848–1852)
Journal of Applied Polymer  Science 123 #3 (2012)

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Monday, 10/31/2011 

DENSITY GRADED LINEAR MEDIUM DENSITY POLYETHYLENE FOAMS PRODUCED UNDER A TEMPERATURE GRADIENT WITH EXPANCEL MICROBEADS
(157-186)
Cellular Polymers 30  #4 (2011)

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Week 43 10/24 through 10/28

Thursday, 10/27/2011 

Tea mill waste fibers filled thermoplastic composites: the effects of plastic type and fiber loading
(833-844)
Journal of Reinforced Plastics and Composites 30 #10 (2011)
Abstract

Stress-relaxation behavior of lignocellulosic high-density polyethylene composites
(875-881)
Journal of Reinforced Plastics and Composites 30 #10 (2011)
Abstract

Wednesday, 10/26/2011 

Radical-Mediated Graft Modification of Polyethylene Models with Vinyltrimethoxysilane: A Fundamental Study
(12246–12253)
Industrial & Engineering Chemistry Research 50 #21 (2011)

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Week 42 10/17 through 10/21

Wednesday, 10/19/2011 

Effects of thermo-oxidative aging on chain mobility, phase composition, and mechanical behavior of high-density polyethylene
(2171–2177)
Polymer  Engineering &  Science 51 #11 (2011)

Rheology/morphology relationship of plasticized and nonplasticized thermoplastic elastomers based on ethylene–propylene–diene–terpolymer and polypropylene
(2314–2327)
Polymer  Engineering &  Science 51 #11 (2011)

Microcellular foaming of low-density polyethylene using nano-CaCo3 as a nucleating agent
(1718–1725)
Polymer Composites 32 #11 (2011)

Tuesday, 10/18/2011 

Production of Ethylene/α-Olefin/1,9-Decadiene Copolymers with Complex Microstructures Using a Two-Stage Polymerization Process
(7926–7939)
Macromolecules 44 #20 (2011)

Monday, 10/17/2011 

Effect of nanofillers on the flame retardant properties of a polyethylene–calcium carbonate–silicone elastomer system
(443–452)
Fire and Materials 35 #7 (2011)

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Week 41 10/10 through 10/14

Friday, 10/14/2011 

EFFECT OF INTERFACIAL MODIFIERS ON PHYSICAL PROPERTIES AND FLAMMABILITY PROPERTIES OF PE/WOOD COMPOSITES
(639-646)
 Polymers and Polymer Composites 19 #8 (2011)

EFFECT OF SURFACE MODIFICATION OF MWCNTS ON CRYSTALLIZATION BEHAVIOUR AND MECHANICAL PROPERTIES OF LDPE/POE/MWCNTS COMPOSITES
(661-668)
 Polymers and Polymer Composites 19 #8 (2011)

THE THERMAL AND MECHANICAL PROPERTIES OF ULTRA-HIGH MOLECULAR POLYETHYLENE/MONTMORILLONITE CLAY (UHMWPE/MMT) NANOCOMPOSITES USING GEL AND PRESSURE-INDUCED FLOW PROCESS (PIF)
(685-696)
 Polymers and Polymer Composites 19 #8 (2011)

Thursday, 10/13/2011 

Synthesis and characterization of low- and medium-molecular-weight hyperbranched polyethylenes by chain walking ethylene polymerization with Pd–diimine catalysts
(5027-5039) Polymer 52 #22 (2011)

The effect of carbon nanotubes on the rheology and electrical resistivity of polyamide 12/high density polyethylene blends
(5085-5091) Polymer 52 #22 (2011)

Investigation of Adhesion Between Metal and Plasma-Modified Polyethylene
(983–988)
 
Plasma Processes and Polymers 8 #10  (2011)

Wednesday, 10/12/2011 

The morphology and property of HDPE in the presence of oscillation pressure and poly(ethylene terephthalate)
(682–690)
Journal of Applied Polymer  Science 123 #2 (2012)

Impact of organoclay and maleated polyethylene on the rheology and instabilities in the extrusion of high density polyethylene
(866–878)
Journal of Applied Polymer  Science 123 #2 (2012)

Structural characterization of LDPE/EVA blends containing nanoclay-flame retardant combinations
(1125–1136)
Journal of Applied Polymer  Science 123 #2 (2012)

Nano-sized silica supported Me2Si(Ind)2ZrCl2/MAO catalyst for ethylene polymerization
(1169–1175)
Journal of Applied Polymer  Science 123 #2 (2012)

Effect of dimethyl formamide in the synthesis of Linear Low Density Polyethylene on branched and molecular structure
(1267–1272)
Journal of Applied Polymer  Science 123 #2 (2012)

Elongational and shear flow behavior of calcium carbonate filled low density polyethylene: Effect of filler particle size, content, and surface treatment
(257–266)
Journal of Applied Polymer  Science 123 #1 (2012)

Effects of an intercalating agent on the morphology and thermal and flame-retardant properties of low-density polyethylene/layered double hydroxide nanocomposites prepared by melt intercalation
(316–323)
Journal of Applied Polymer  Science 123 #1 (2012)

Compatibilizer in waste tire powder and low-density polyethylene blends and the blends modified asphalt
(485–492)
Journal of Applied Polymer  Science 123 #1 (2012)

Covulcanization of LLDPE/EMA blends using dicumyl peroxide
(502–509)
Journal of Applied Polymer  Science 123 #1 (2012)

Tuesday, 10/11/2011 

Mechanical Properties of Chemically Treated Sawdust-Reinforced Recycled Polyethylene Composites
(11124–11129)
Industrial & Engineering Chemistry Research 50 #19 (2011)

Correlation between molecular structure parameters and network properties of silane-grafted and moisture cross-linked polyethylenes
(286–300)
Advances in Polymer Technology 30 #4 (2011)

Microstructure and fracture behavior of maleated high-density polyethylene/ silicon carbide nanocomposites toughened with poly(styrene-ethylene-butylene-styrene) triblock copolymer
(322–333)
Advances in Polymer Technology 30 #4 (2011)

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Week 40 10/3 through 10/7

Friday 10/7/2011

Thermodynamics of inelastic deformation of amorphous and crystalline phases in linear polyethylene
(775-786)  
Polymer Science: Series A 53 #9 (2011)

Thursday 10/6/2011

Curing Characteristics, Morphological, Tensile and Thermal Properties of Bentonite-Filled Ethylene-Propylene-Diene Monomer (EPDM) Composites
(1421-1428)
Polymer - Plastics Technology and Engineering 50 #14 (2011)
Abstract

Rheology, Crystallization Kinetics and Mechanical Properties of HDPE/Vinyl-POSS Nanocomposites
(1429-1437)
Polymer - Plastics Technology and Engineering 50 #14 (2011)
Abstract

Kinetics Modeling and Mechanism of Organic Matter Absorption in Functional Fiber Based on Butyl Methacrylate-Hydroxyethyl Methacrylate Copolymer and Low Density Polyethylene
(1496-1505)
Polymer - Plastics Technology and Engineering 50 #14 (2011)
Abstract

Photodegradation of ethylene–octene copolymers with different octene contents
(1961-1972) Polymer Degradation and Stability 96 #11 (2011)

A comparative study on the mechanical and degradation properties of plant fibers reinforced polyethylene composites
(1552–1560)
Polymer Composites 32 #10 (2011)

Gas barrier and morphology characteristics of linear low-density polyethylene and two different polypropylene films
(1293-1309)  
Polymer Bulletin 67 #7 (2011)

Crystalline structure of polyethylene containing vinylene units in the main chain
(4857-4866) Polymer 52 #21 (2011)

Wednesday 10/5/2011

The influence of surfactants and ionic liquids on the mechanical and magnetic properties of ethylene-propylene copolymers filled with micrometer and nanometer magnetite (English abstract Polish article)
Polimery #10 (2011)

Melting and van der Waals Stabilization of PE Single Crystals Grown from Ultrathin Films
(7752–7757)
Macromolecules 44 #19 (2011)

Controlling Cavitation of Semicrystalline Polymers during Tensile Drawing
(7273–7287)
Macromolecules 44 #18 (2011)

ROMP-CT/NMP Synthesis of Multiblock Copolymers Containing Linear Poly(ethylene) Segments
(7141–7148)
Macromolecules 44 #18 (2011)

Tuesday 10/4/2011

Comprehensive Investigation of Catalyst Structure and Polymerization Conditions for Chain Branching in Ethylene Polymerization with Phillips-Type Catalysts
(332–339)
Macromolecular Reaction Engineering 5 #9-10 (2011)

A Polymerization Kinetics Comparison between a Metallocene Catalyst Activated by Tetrakis(pentafluorophenyl) Borate and MAO for the Polymerization of Ethylene in a Semi-batch Solution Reactor
(418–430)
Macromolecular Reaction Engineering 5 #9-10 (2011)

Living regioselective copolymerization of ethylene with nonconjugated bicyclic dienes using (salicylaldiminato)(β-enaminoketonato) titanium catalysts
(4626–4638)
Journal of Polymer Science Part A: Polymer  Chemistry 49 #21 (2011)

EFFECTIVENESS OF POLAR MODIFYING ADDITIVES FOR POLYETHYLENE
(T/1-T/5)
International Polymer Science and Technology 38, #7 (2011)

Monday 10/3/2011

Mechanical Properties of Chemically Treated Sawdust-Reinforced Recycled Polyethylene Composites
(11124–11129)  
Industrial & Engineering Chemistry Research 50 #18 (2011)

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September 2011

Tuesday 9/20/2011

Synthesis of functional polyethylene via copolymerization of ethylene and substituted allene using bis(β-enaminoketonato)titanium catalysts
(692-698)
Chinese Journal of Polymer Science 29, #6 (2011)

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Tuesday 9/20/2011

Synthesis and structural characterization of ethylene–norbornene copolymer with high norbornene content catalyzed by β-diketiminato nickel/methylaluminoxane
(1964-1969) European Polymer Journal 47  #10 (2011)

Cross-linking kinetics study and high temperature mechanical properties of ethylene–octene copolymer (EOC)/dicumylperoxide(DCP) system
(1949-1955) European Polymer Journal 47  #10 (2011)

Semi-empirical model of toluene transport in polyethylene membranes based on the data using a new type of apparatus for determining gas permeability, diffusivity and solubility
(5566-5574) Chemical Engineering Science 66  #22 (2011)

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Friday 9/16/2011

New Strategies for Predicting Parison Dimensions in Extrusion Blow Molding
(1329-1337)
Melt Flow Properties and Melt Density of POM/EVA/HDPE Nanocomposites
(1338-1343)
Polymer - Plastics Technology and Engineering 50 #13 (2011)
Abstract

Study on Effect of Incorporation of Gelatin Fiber in Jute Fabrics-Reinforced Linear Low Density Polyethylene Composite
(1344-1350)
Polymer - Plastics Technology and Engineering 50 #13 (2011)
Abstract

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Thursday 9/15/2011

Polymerization of ethylene using amido functional half-sandwich complexes of group 4 metals
(2102–2107)
Polymer  Engineering &  Science 51 #10 (2011)

Surface Modification of Nanoclays by Plasma Polymerization of Ethylene
(842–849)
Plasma Processes and Polymers 8 #9  (2011)

SAXS/DSC Analysis of the Lamellar Thickness Distribution on a SSA Thermally Fractionated Model Polyethylene
(2009–2016)
Macromolecular Chemistry and Physics 212 #18 (2011)

An Efficient In Situ Polymerization Method for the Production of Polyethylene/Clay Nanocomposites: Effect of Polymerization Conditions on Particle Morphology
(2017–2028)
Macromolecular Chemistry and Physics 212 #18 (2011)

On the origin of the “core-free” morphology in microinjection-molded HDPE
(1470–1478)
Journal of Polymer Science B: Polymer Physics 49, #20 (2011)

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Wednesday 9/14/2011

Characterization of poly(ethylene-co-vinyl acetate-co-carbon monoxide)/layered silicate clay hybrids obtained by melt mixing
(7423-7430)
Journal of Materials Science 46 #23 (2011)

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Tuesday 9/13/2011

Storing Effects on Electrical Properties of High Energy Electron Beam Irradiated LDPE and HDPE
(939-946)
 International Journal of Polymeric Materials 60 #12 (2011)

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Friday 9/9/2011

Features of the amorphous-crystalline structure of UHMWPE
(75-88)
Polymer Science: Series C 53 #1 (2010) 

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Wednesday 9/7/2011

The extractability of phenolic antioxidants into water and organic solvents from polyethylene pipe materials – Part I
(1751-1760)
Polymer Degradation and Stability 96 #10 (2011)

Melt stabilisation of Phillips type polyethylene, Part III: Correlation of film strength with the rheological characteristics of the polymer
(1771-1779)
Polymer Degradation and Stability 96 #10 (2011)

Monitoring the influence of different weathering conditions on polyethylene pipes by IR-microscopy
(1901-1910)
Polymer Degradation and Stability 96 #10 (2011)

Structure, dynamics and interactions of complex sol–gel hybrid materials through SSNMR and DSC: Part I, binary systems based on PE-PEG block copolymer, PHS and silica
(4536-4544)
Polymer 52 #20 (2011)

Structure, dynamics and interactions of complex sol–gel hybrid materials through SSNMR and DSC: Part II, ternary systems based on PE–PEG block copolymer, PHS and silica
(4545-4552)
Polymer 52 #20 (2011)

Mechanisms of nucleation and crystal growth in a nascent isotactic polypropylene/poly (ethylene-co-octene) in-reactor alloy investigated by temperature-resolved synchrotron SAXS and DSC methods
(4590-4599)
Polymer 52 #20 (2011)

An in-situ X-ray scattering study during uniaxial stretching of ionic liquid/ultra-high molecular weight polyethylene blends
(4610-4618)
Polymer 52 #20 (2011)

Ethylene Copolymers with Crystallizable Side Chains
(6759–6766)
Macromolecules 44 #17 (2011)

Morphology Development in Model Polyethylene via Two-Dimensional Correlation Analysis
(6836–6848)
Macromolecules 44 #17 (2011)

Local Polarity and Microviscosity of the Interior of Dendritic Polyethylene Amphiphiles
(6885–6890)
Macromolecules 44 #17 (2011)

The Effects of Loading History and Manufacturing Methods on the Mechanical Behavior of High-Density Polyethylene
(451-468)
Journal of Elastomers and Plastics 43 #5 (2011)
Abstract

Design feature sensitivity analysis in a numerical model of an extrusion spider die
(3537–3543)
 Journal of Applied Polymer  Science 122 #6 (2011)

Mechanical properties of injection-molded binary blends of polyethylene with small additions of a liquid-crystalline polymer
(3564–3568)
 Journal of Applied Polymer  Science 122 #6 (2011)

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Tuesday 9/6/2011

Evaluation and modeling of the mechanical behavior of carbon nanoparticle/rubber-modified polyethylene nanocomposites
(3023–3029)
Journal of Applied Polymer  Science 122 #5 (2011)

Ethylene polymerization over supported titanium-magnesium catalysts: Effect of polymerization parameters on the molecular weight distribution of polyethylene
(3092–3101)
Journal of Applied Polymer  Science 122 #5 (2011)

Influence of carbon black on decompression failure and hydrogen permeation properties of filled ethylene-propylene–diene–methylene rubbers exposed to high-pressure hydrogen gas
(3172–3187)
Journal of Applied Polymer  Science 122 #5 (2011)

Characterization of ethylene-propylene copolymers with high-temperature gradient adsorption liquid chromatography and CRYSTAF
(3211–3217)
Journal of Applied Polymer  Science 122 #5 (2011)

Effect of different metallic hydroxides on flame-retardant properties of low density polyethylene/melamine polyphosphate/starch composites
(3263–3269)
Journal of Applied Polymer  Science 122 #5 (2011)

Toughness of HDPE/CaCO3 microcomposites prepared from masterbatch by melt blend method
(3303–3315)
Journal of Applied Polymer  Science 122 #5 (2011)

089[2011]  Preparation of polyethylene-g-(polyacrylic acid) and its sodium salt ionomer by in-situ chlorinating graft copolymerization
e-Polymers (9/6/2011) (89)
[Abstract]

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Friday 9/2/2011

Application of the Low Frequency Raman Spectroscopy for Studying Ultra-High Molecular Weight Polyethylenes
(63–72)
Macromolecular Symposia 305 #1 (2011)

Mechanical and Antibacterial Properties of Treated and Untreated Zinc Oxide filled UHMWPE Composites
(653-667)
Journal of Thermoplastic Composite Materials 24 #5 (2011)
Abstract

Study and Production of Silicone Rubber and Polyethylene Alloy
(669-677)
Journal of Thermoplastic Composite Materials 24 #5 (2011)
Abstract

Effect of Incorporation of Polypropylene on the Physico-Mechanical and Thermo-Mechanical Properties of Gelatin Fiber Based Linear Low Density Polyethylene Bio-foamed Composite
(679-694)
Journal of Thermoplastic Composite Materials 24 #5 (2011)
Abstract

Annealing of melt-crystallized polyethylene and its influence on microstructure and mechanical properties: A comparative study on branched and linear polyethylenes
(1347–1359)
Journal of Polymer Science B: Polymer Physics 49, #19 (2011)

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August 2011

Thursday 8/25/2011

Preparation of natural rubber (NR) latex/low density polyethylene (LDPE) blown film and its properties
(716-725) Polymer Testing 30 #7 (2011)

Conducting films of poly(aniline-co-1-amino- 2-naphthol-4-sulfonic acid) blended with LDPE for its application as antistatic encapsulation material
(1319–1328)
Polymers for Advanced Technologies 22 #9 (2011)

Metallocene ethylene-co-(5,7-dimethylocta-1, 6-diene) copolymers crosslinked using electron beam irradiation: a tunable alternative
(1309–1317)
Polymer International 60 #9 (2011)

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Wednesday 8/24/2011

Studies on quick functionalization of polyethylene through ultraviolet irradiation and its composites
(951-960)
Polymer Bulletin 67 #6 (2011)

Different factors affecting the mechanical and thermo-mechanical properties of HDPE reinforced with micro-CaCO3
(769-780)
Journal of Reinforced Plastics and Composites 30 #9 (2011)
Abstract

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Monday 8/22/2011

On the Effect of Nanosilver Reinforcement on the Mechanical, Physical, and Antimicrobial Properties of Polyethylene Blown Films
(1873-1881)
Journal of Macromolecular Science, Part B - Physics 50  #10 (2011)

Experimental investigation of flow induced molecular weight fractionation during extrusion of HDPE polymer melts
( 4814-4823) Chemical Engineering Science 66  #20 (2011)

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Tuesday 8/16/2011

Development of Intermolecular Structure and Beta-phase of Random Poly[9,9-bis(2-ethylhexyl)fluorene]-co-(9,9-dioctylfluorene) in Methylcyclohexane
(6453–6460)
Macromolecules 44 #16 (2011)

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Monday 8/15/2011

Mechanical strengths of molten and solidified LLDPE/LDPE blends and wood/LDPE composites under tensile deformation
(164–176)
Journal of Vinyl and Additive Technology 17, #3 (2011)

DIFFERENCES IN THE OZONE-PROTECTION ACTION OF CHLORINATED TERNARY COPOLYMERS OF ETHYLENE AND PROPYLENE IN COVULCANISATES WITH BUTADIENE-ACRYLONITRILE RUBBERS
(T/19-T/20)
International Polymer Science and Technology 38, #5 (2011)

Influence of Processing Conditions on Productivity, Thermal and Rheological Properties of Reprocessed Low Density Polyethylene
(383-387)
International Polymer Processing #4 (2011)

Polymerization of 1-octene and determination of markhouwink constants of poly(1-octene)
(560-565)
Chinese Journal of Polymer Science 29, #5 (2011)

Ethylene/1-hexene copolymerization by salicylaldiminato vanadium(III) complexes activated with diethylaluminum chloride
(627-633)
Chinese Journal of Polymer Science 29, #5 (2011)

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Friday 8/12/2011

Synthesis of polyethene–graft–polystyrene copolymers from linear polyethene-containing cyclopropane rings 
(714-717)
Polymer Journal 43 #8 (2011)
Abstract

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Thursday 8/11/2011

Control of the migration behavior of slip agents in polyolefin-based films
(1763–1769)
Polymer  Engineering &  Science 51 #9 (2011)

The effect of thermoplastic starch on the properties of HDPE/TPS blends during UV-accelerated aging
(903-914)
Polymer Bulletin 67 #5 (2011)

Elmendorf Tear Test of Polyethylene Films: Mechanical Interpretation and Model
(729–743)
Macromolecular Materials and Engineering 296 #8 (2011)

A study on the flow, failure, and rupture mechanisms of low-density polyethylene in controlled-stress uniaxial extensional flow
(# 3596210) Journal of Rheology 55 #5 (2011)

Influence of annealing on linear viscoelasticity of carbon black filled polystyrene and low-density polyethylene
(# 3604816 ) Journal of Rheology 55 #5 (2011)

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Wednesday 8/10/2011

Surface oxidation of low-density polyethylene films to improve their susceptibility toward environmental degradation
(2765–2773)
Journal of Applied Polymer  Science 122 #4 (2011)

Correlation of Arrhenius parameters for UHMWPE synthesis with ethylene solubility characteristics in different polymerization media
(2646–2652)
Journal of Applied Polymer  Science 122 #4 (2011)

Thermostimulative shape memory effect of linear low-density polyethylene/polypropylene (LLDPE/PP) blends compatibilized by crosslinked LLDPE/PP blend (LLDPE–PP)
(2512–2519)
Journal of Applied Polymer  Science 122 #4 (2011)

Crystallization kinetics of ultra high-molecular weight polyethylene in liquid paraffin during solid–liquid thermally induced phase separation process
(2442–2448)
Journal of Applied Polymer  Science 122 #4 (2011)

Effect of chemical modification of oil fly ash and compatibilization on the rheological and morphological properties of low-density polyethylene composites
(2486–2496)
Journal of Applied Polymer  Science 122 #4 (2011)

Melt functionalization of LDPE with thio ester, amino ester, and hydroxy ester by thermolysis method—An FTIR study
(2252–2261)
Journal of Applied Polymer  Science 122 #4 (2011)

Effect of propylation of starch with different degrees of substitution on the properties and characteristics of starch-low density polyethylene blend films
(2197–2208)
Journal of Applied Polymer  Science 122 #4 (2011)

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8/3/2011

Synthesis and characterization of trichlorotitanium 2-(2-pyridinyliminomethyl)phenolates and their ethylene (co-)polymerization behavior
(3732-3737)  Polymer 52 #17 (2011)

Cylindritic structures of high-density polyethylene molded by multi-melt multi-injection molding
(3871-3878)  Polymer 52 #17 (2011)

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8/2/2011

New Polyethylene Based Anion Exchange Membranes (PE–AEMs) with High Ionic Conductivity
(5937–5946)
Macromolecules 44 #15 (2011)

Temporary shape development in shape memory nanocomposites using magnetic force
(1709-1719) European Polymer Journal 47  #8 (2011)

Optical properties of a polyethylene dispersion with a luminescent silica prepared by surface grafting of a perylene derivative
(1589-1600) European Polymer Journal 47  #8 (2011)

Effect of the presence of silica nanoparticles in the coefficient of thermal expansion of LDPE
(1495-1502) European Polymer Journal 47  #8 (2011)

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July

7/29/2011

Non-isothermal thermogravimetry, differential scanning calorimetry and chemiluminescence in degradation of polyethylene, polypropylene, polystyrene and poly(methyl methacrylate)
( 1573-1581)
Polymer Degradation and Stability 96 #9 (2011)

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7/27/2011

Ethylene/1-Hexene Copolymers Produced with MAO/(nBuCp)2ZrCl2 Supported on SBA-15 Materials with Different Pore Sizes
( 1590–1599)
Macromolecular Chemistry and Physics 212 #15 (2011)

Dynamic rheological, morphology and mechanical properties of compatibilized LLDPE/EMA blends
(907-916)
Journal of Polymer Research 18  #5 (2011)

Thermal behaviour of nanocomposites based on linear-low-density poly(ethylene) and carbon nanotubes prepared by high energy ball milling
(949-956)
Journal of Polymer Research 18  #5 (2011)

Effectiveness of a maleated compatibilizer on the tensile and tear properties of peroxide-cured metallocene polyethylene/clay nanocomposites
(1033-1042)
Journal of Polymer Research 18  #5 (2011)

FI Zr-type catalysts for ethylene polymerization
(1059-1065)
Journal of Polymer Research 18  #5 (2011)

The effects of blend ratio, compatibilization and dynamic vulcanization on permeation of gases through HDPE/EVA blends
(1101-1109)
Journal of Polymer Research 18  #5 (2011)

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7/26/2011

The effect of process parameters on physical and mechanical properties of commercial low density polyethylene/ORG-MMT nanocomposites
(6642-6647)  
Journal of Materials Science 46 #20 (2011)

Effects of Blend Ratio on Rheology, Morphology, Mechanical and Oil-Resistant Properties in Chlorinated Polyethylene Rubber and Copolyamide Blends
(1659-1672)
Journal of Macromolecular Science, Part B - Physics 50  #9 (2011)

HIGH-TEMPERATURE AGEING OF VULCANISED RUBBER PRODUCTS BASED ON ETHYLENE-PROPYLENE RUBBER MODIFIED USING VARIABLE-VALENCY METAL PARTICLES
(T/13-T/14)
International Polymer Science and Technology 38, #4 (2011)

METALLOCENE CATALYSTS FOR SYNTHESIS OF ETHYLENE-PROPYLENE RUBBER
(T/23-T/28)
International Polymer Science and Technology 38, #4 (2011)

Late Transition Metal Catalyst Based on Cobalt for Polymerization of Ethylene
(776-786) International Journal of Polymeric Materials 60 #10 (2011)

Effect of melt viscosity on the crystallization kinetics of pre-sheared metallocene polyethylene melts
(1347-1359)
Colloid and Polymer Science 289 #12 (2011)

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7/21/2011

Analysis of temperature and aging effects on biomedical ultra-high molecular weight polyethylene’s grades using a viscoelastic model
(641-650)  Polymer Testing 30 #6 (2011)

Experimental and numerical analysis of a LLDPE/HDPE liner for a composite pressure vessel
(693-700)  Polymer Testing 30 #6 (2011)

Effect of Vibration Extrusion on Mechanical Properties and Structure of HDPE/OMMT Nanocomposites
(1091-1095)
Polymer - Plastics Technology and Engineering 50 #11 (2011)
Abstract

The Influence of Polyethylene-Polyamine Surface Treatment of Carbon Nanotube on the TPB and Friction and Wear Behavior of Thermoplastic Polyimide Composite
(996-999)
Polymer - Plastics Technology and Engineering 50 #10 (2011)

Effect of Molecular Weight of Natural Rubber on the Compatibility and Crystallization Behavior of LLDPE/NR Blends
(1019-1026)
Polymer - Plastics Technology and Engineering 50 #10 (2011)

Rheological Responses and Morphology of Polylactide/Linear Low Density Polyethylene Blends Produced by Different Mixing Type
(1035-1039)
Polymer - Plastics Technology and Engineering 50 #10 (2011)

Peroxide cured natural rubber/fluoroelastomer/high-density polyethylene via dynamic vulcanization
(1484–1488)
Polymer  Engineering &  Science 51 #8 (2011)

Stabilizer thickness profiles in polyethylene pipes transporting drinking water disinfected by bleach
(1541–1549)
Polymer  Engineering &  Science 51 #8 (2011)

Effect of processing and density on morphology and creep behavior of linear low-density polyethylene
(1642–1649)
Polymer  Engineering &  Science 51 #8 (2011)

Structure and properties of phase-change materials based on high-density polyethylene, hard Fischer–Tropsch paraffin wax, and wood flour
(1155–1163)
 
Polymer Composites 32 #8 (2011)

Flow-induced epitaxial growth of high density polyethylene in its blends with low crystallizable polypropylene copolymer
(3655-3660) Polymer 52 #16 (2011)

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7/20/2011

Influence of flavanone on the stabilization of ethylene-propylene elastomer (in English)
Polimery #7-8 (2011)

Unprecedented High-Modulus High-Strength Tapes and Films of Ultrahigh Molecular Weight Polyethylene via Solvent-Free Route
(5558–5568)
Macromolecules 44 #14 (2011)

Facile Functionalization of Polyethylene via Click Chemistry
(5659–5665)
Macromolecules 44 #14 (2011)

A new conduction phenomenon observed in polyethylene and epoxy resin: Ultra-fast soliton conduction
(1173–1182)
Journal of Polymer Science B: Polymer Physics 49, #16 (2011)

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7/19/2011

Properties of ultra high molecular weight polyethylene fibers after ion beam treatment
(1628–1633)
 
Journal of Applied Polymer  Science 122 #3 (2011)

Comparative study of maleated polypropylene as a coupling agent for recycled low-density polyethylene/wood flour composites
(1731–1741)
 
Journal of Applied Polymer  Science 122 #3 (2011)

Comparative study of copolymerization and terpolymerization of ethylene/propylene/diene monomers using metallocene catalyst
(1838–1846)
 
Journal of Applied Polymer  Science 122 #3 (2011)

Effects of SiO2 and Al2O3 nanofillers on polyethylene properties
(1921–1935)
 
Journal of Applied Polymer  Science 122 #3 (2011)

Structure characterization of cold drawn high density polyethylene thin film
(2026–2032)
 
Journal of Applied Polymer  Science 122 #3 (2011)

Preparation of thermoplastic vulcanizates based on waste crosslinked polyethylene and ground tire rubber through dynamic vulcanization
(2110–2120)
 
Journal of Applied Polymer  Science 122 #3 (2011)

Polyethylene-montmorillonite nanocomposites obtained by in situ polymerization of ethylene with nickel-diimine catalysts
(2159–2165)
 
Journal of Applied Polymer  Science 122 #3 (2011)

IMPROVING THE STRUCTURE AND PHYSICAL PROPERTIES OF LDPE FOAMS USING SILICA NANOPARTICLES AS AN ADDITIVE
(63-78)
Cellular Polymers 30  #2 (2011)

POLYETHYLENE FOAMS PRODUCED UNDER A TEMPERATURE GRADIENT WITH EXPANCEL AND BLENDS THEREOF
(259-282)
Cellular Polymers 29  #5 (2010)

Optimal process operation for the production of linear polyethylene resins with tailored molecular weight distribution
(2149–2163)
 
AIChE Journal 57 #8 (2011)

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7/15/2011

Crazing of isotactic polypropylene in the medium of supercritical carbon dioxide
(546-557)
Polymer Science: Series A 53 #7 (2011)

Effect of Molecular Weight of Natural Rubber on the Compatibility and Crystallization Behavior of LLDPE/NR Blends
(1019-1026) Polymer - Plastics Technology and Engineering 50 #10 (2011)

 Rheological Responses and Morphology of Polylactide/Linear Low Density Polyethylene Blends Produced by Different Mixing Type
(1035-1039) Polymer - Plastics Technology and Engineering 50 #10 (2011)

Peroxide cured natural rubber/fluoroelastomer/high-density polyethylene via dynamic vulcanization
(1484–1488)
Polymer  Engineering &  Science 51 #8 (2011)

Stabilizer thickness profiles in polyethylene pipes transporting drinking water disinfected by bleach
(1541–1549)
Polymer  Engineering &  Science 51 #8 (2011)

Effect of processing and density on morphology and creep behavior of linear low-density polyethylene
(1642–1649)
Polymer  Engineering &  Science 51 #8 (2011)

sStructure and properties of phase-change materials based on high-density polyethylene, hard Fischer–Tropsch paraffin wax, and wood flour
(1155–1163)
Polymer Composites 32 #8 (2011)

Poly[ethylene-co-(acrylic acid)]-based nanocomposites: Thermal and mechanical properties and their structural characteristics studied by Raman spectroscopy
(1181–1189)
Polymer Composites 32 #8 (2011)

Flow-induced epitaxial growth of high density polyethylene in its blends with low crystallizable polypropylene copolymer
(3655-3660) Polymer 52 #16 (2011)

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7/14/2011

Physical and Mechanical Properties of Rapeseed Waste-filled LLDPE Composites
(447-458)
Journal of Thermoplastic Composite Materials 24 #4 (2011)
Abstract

Effect of Electron Beam Irradiation on the Mechanical, Thermal, and Dynamic Mechanical Behavior of Waste Polyethylene - Short Glass Fiber Composites
(459-476)
Journal of Thermoplastic Composite Materials 24 #4 (2011)
Abstract

Tensile Creep Behavior of Medium-Density Polyethylene
(555-566)
Journal of Thermoplastic Composite Materials 24 #4 (2011)
Abstract

Modification of ultra-high-molecular weight polyethylene by various fluorinating routes
(3559–3573)
 Journal of Polymer Science Part A: Polymer  Chemistry 49 #16 (2011)xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx  

7/13/2011

Effects of reprocessing on the hygroscopic behavior of natural fiber high-density polyethylene composites
(1258–1267)
Journal of Applied Polymer  Science 122 #2 (2011)

Morphological and structural development of recycled crosslinked polyethylene during solid-state mechanochemical milling
(257–264)
Journal of Applied Polymer  Science 122 #1 (2011)

Modeling of a multizone gas-phase polyethylene reactor with a cluster-based approach
(393–405)
Journal of Applied Polymer  Science 122 #1 (2011)

Effect of molecular weight of polyethylene on its flammability
(436–443)
Journal of Applied Polymer  Science 122 #1 (2011)

Crystallization behavior and mechanical properties of polypropylene random copolymer/poly(ethylene-octene) blends
(461–468)
Journal of Applied Polymer  Science 122 #1 (2011)

Oxidative degradations of oxodegradable LDPE enhanced with thermoplastic pea starch: Thermo-mechanical properties, morphology, and UV-ageing studies
(489–496)
Journal of Applied Polymer  Science 122 #1 (2011)

Modification of linear low-density polyethylene film using oxygen scavengers for its application in storage of bun and bread
(55–63)
Journal of Applied Polymer  Science 122 #1 (2011)

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7/7/2011

Structural explanation on natural draw ratio of metallocene-catalyzed high density polyethylene
(3469-3477) Polymer 52 #15 (2011)

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7/6/2011

Correlations between the Characteristic Rheological Quantities and Molecular Structure of Long-Chain Branched Metallocene Catalyzed Polyethylenes
(5401–5413)
Macromolecules 44 #13 (2011)

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7/5/2011

Tensile Creep Behavior of Medium-Density Polyethylene
(555-566)
Journal of Thermoplastic Composite Materials 24 #3 (2011)
Abstract

Physical and Mechanical Properties of Rapeseed Waste-filled LLDPE Composites
(447-458)
Journal of Thermoplastic Composite Materials 24 #3 (2011)
Abstract

Effect of Electron Beam Irradiation on the Mechanical, Thermal, and Dynamic Mechanical Behavior of Waste Polyethylene - Short Glass Fiber Composites
(459-476)
Journal of Thermoplastic Composite Materials 24 #3 (2011)
Abstract

Kinetic Study of the Thermal Processing and Pyrolysis of Crosslinked Ethylene Vinyl Acetate–Polyethylene Mixtures
(7964–7976)
Industrial & Engineering Chemistry Research 50 #13 (2011)

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June 2011

6/27/2011

The Influence of Blend Morphology (Co-Continuous or Sub-Micrometer Droplets Dispersions) on the Nucleation and Crystallization Kinetics of Double Crystalline Polyethylene/Polyamide Blends Prepared by Reactive Extrusion
(1335–1350)
Macromolecular Chemistry and Physics 212 #13 (2011)

1H-NMR study of maleic anhydride modified ethylene-diene copolymers
(527-532)
Journal of Polymer Research 18  #4 (2011)

Enhancement of processability and foamability of ground tire rubber powder and LDPE blends through solid state shear milling
(533-539)
Journal of Polymer Research 18  #4 (2011)

Dynamic mechanical, thermal, physico-mechanical and morphological properties of LLDPE/EMA blends
(569-578)
Journal of Polymer Research 18  #4 (2011)

Molecular dynamics simulation of bubble nucleation in Carbon Dioxide/Hexadecane Solution as an analog to foaming of polyethylene by Super Critical Carbon Dioxide
(117-126)
Journal of Plastic Film and Sheeting 27  #1-2 (2011)
Abstract

057[2011]  Study on electrical property relaxations of 10 MeV electron beam irradiated HDPE
e-Polymers (6/27/2011) (68)
[Abstract]

062[2011]  Tribological behavior of GUR 1020 UHMWPE Polymer in lubricated environment
e-Polymers (6/27/2011) (68)
[Abstract]

067[2011]  Effect of aspect ratio, surface modification and compatibilizer on the mechanical and thermal properties of LDPE-MWCNT nanocomposites
e-Polymers (6/27/2011) (68)
[Abstract]

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6/24/2011

Effect of trimethylaluminum on the polymerization of ethylene with the catalytic system Bis[N-(3,5-di-tert-butylsalicylidene)-2,3,5,6-tetrafluoroanilinato]titanium(IV) dichloride-methylaluminoxane
(629-636)
Polymer Science: Series B 53 5-6 (2011)

Effect of fullerene C60 on the structure and mechanical characteristics of polyethylene: Technological aspect
(488-501)
Polymer Science: Series A 53 #6 (2011)

An alternative approach to estimating parameters in creep models of high-density polyethylene
(1227–1235)
 
Polymer  Engineering &  Science 51 #7 (2011)

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6/23/2011

Surface degradation of poly(ethylene-co-propylene-co-5-ethylidene-2-norbornene) terpolymer by ozone in water
(1503-1507) Polymer Degradation and Stability 96 #8 (2011)

Effects of thermal aging on morphology, resistivity, and thermal properties of extruded high-density polyethylene/carbon black heating elements
(1049–1061)
 
Polymer Composites 32 #7 (2011)

Effect of clay dispersion on the cell structure of LDPE/clay nanocomposite foams
(1095–1105)
 
Polymer Composites 32 #7 (2011)

Acrylamide–formaldehyde–urea copolymer as a novel compatibilizer for high density polyethylene/plant fiber composite
(375-382)
Polymer Bulletin 67 #3 (2011)

Polymerization of ethylene to branched poly(ethylene)s using ansa5-monofluorenyl cyclohexanolato zirconium(IV) complex/methylaluminoxane
(383-399)
Polymer Bulletin 67 #3 (2011)

Interfacial adhesion study on UHMWPE fiber-reinforced composites
(527-540)
Polymer Bulletin 67 #3 (2011)

Assessing the effect of molecular weight on the kinetics of backbone scission reactions in polyethylene using Reactive Molecular Dynamics
(3104-3111)  Polymer 52 #14 (2011)

The influence of carbon-based nanofillers on the melt flow singularity of linear polyethylene
(3163-3174)  Polymer 52 #14 (2011)

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6/22/2011

Annealing of Single Lamella Nanoparticles of Polyethylene
(4845–4851)
Macromolecules 44 #12 (2011)

Heterogeneity in the Distribution of Entanglement Density during Polymerization in Disentangled Ultrahigh Molecular Weight Polyethylene
(4952–4960)
Macromolecules 44 #12 (2011)

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6/21/2011

Unusual Crystallization Behavior of Polyethylene Having Precisely Spaced Branches
(4030–4034)
Macromolecules 44 #11 (2011)

Synthesis and Structure–Property Relationships of Polypropylene-g-poly(ethylene-co-1-butene) Graft Copolymers with Well-Defined Long Chain Branched Molecular Structures
(4167–4179)
Macromolecules 44 #11 (2011)

Copolymerization of Ethylene with Norbornene by Neutral Aryl Phosphine Sulfonate Palladium Catalyst
(4180–4186)
Macromolecules 44 #11 (2011)

Catalytic Ring-Opening Polymerization of Renewable Macrolactones to High Molecular Weight Polyethylene-like Polymers
(4301–4305)
Macromolecules 44 #11 (2011)

Review
Bimodality Criterion for the Chemical Composition Distribution of Ethylene/1-Olefin Copolymers: Theoretical Development and Experimental Validation
(198–210)
Macromolecular Reaction Engineering 5 #5-6 (2011)

Synthesis of Heterobifunctional Hyperbranched Polyethylenes Tethered with Dual Acryloyl and 2-Bromoisobutyryl Functionalities via One-Pot Chain-Walking Terpolymerization
(1255–1262)
Macromolecular Chemistry and Physics 212 #12 (2011)

Biodegradation of Thermoplastic Starch and its Blends with Poly(lactic acid) and Polyethylene: Influence of Morphology
(1147–1154)
Macromolecular Chemistry and Physics 212 #11 (2011)

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6/17/2011

Eliminating sharkskin distortion in polyethylene extrusion via a molecular route
(#3589798)
 Journal of Rheology 55 #4 (2011)

Molecular Modification and Compatibilization of Collected Polyethylene
(335-340)
Journal of Polymers and the Environment 19 #2 (2011)

Sjöqvist and Boldizar of Chalmers University of Technology, Sweden, used EPDM as a compatibilizer for recycled PE/PP blends.  (RDC 6/17/2011)

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6/16/2011

Preparation of expandable graphite using a hydrothermal method and flame-retardant properties of its halogen-free flame-retardant HDPE composites
(483-488)
Journal of Polymer Research 18  #3 (2011)

Dynamic mechanical, thermal, physico-mechanical and morphological properties of LLDPE/EMA blends
(569-578)
Journal of Polymer Research 18  #3 (2011)

Effect of UHMWPE concentration on the extracting, drawing, and crystallizing properties of gel fibers
(5690-5697)
 Journal of Materials Science 46 #17 (2011)

Dynamic Rheological Behavior of HDPE/UHMWPE Blends
(1249 – 1259)
Journal of Macromolecular Science, Part B - Physics 50  #7 (2011)

Preparation and Mechanical and Tribological Properties of High-Density Polyethylene/Hydroxyapatite Nanocomposites
(1325 – 1337)
Journal of Macromolecular Science, Part B - Physics 50  #7 (2011)

Study of Temperature and UV Wavelength Range Effects on Degradation of Photo-Irradiated Polyethylene Films Using DMA
(1338 – 1349)
Journal of Macromolecular Science, Part B - Physics 50  #7 (2011)

Preparation and comparative study of a new porous polyethylene ocular implant using powder printing technology
(317-331)
Journal of Bioactive and Compatible Polymers 26 #3 (2011)
Abstract

Influence of morphology effects on electrical properties in XLPE
(3483–3494)
Journal of Applied Polymer  Science 121 #6 (2011)

Effects of the structural components on slow crack growth process in polyethylene blends. Composition intervals prediction for pipe applications
(3269–3276)
Journal of Applied Polymer  Science 121 #6 (2011)

Attaining optimal dyeability and tensile properties of polypropylene/poly(ethylene terephthalate) blends with a special cubic mixture experimental design
(3201–3210)
Journal of Applied Polymer  Science 121 #6 (2011)

Rheological and mechanical properties of poly (ethylene acrylic acid) and low density polyethylene blends
(3070–3077)
Journal of Applied Polymer  Science 121 #5 (2011)

Ethylene/α-olefin copolymerization by nonbridged (cyclopentadienyl)(aryloxy)titanium(IV) dichloride/AliBu3/Ph3CB(C6F5)4 catalyst systems
(3085–3092)
Journal of Applied Polymer  Science 121 #5 (2011)

Modulation of barrier properties of monolayer films from blends of polyethylene with ethylene-co-norbornene
(3020–3027)
Journal of Applied Polymer  Science 121 #5 (2011)

Dynamic mechanical properties of polystyrene-block-poly[ethylene-co-(ethylene-propylene)]-block-polystyrene triblock copolymer/hydrocarbon oil blends
(3001–3006)
Journal of Applied Polymer  Science 121 #5 (2011)

Modeling the tensile behavior of ultra-high-molecular-weight polyethylene with a novel flow rule
(2936–2944)
Journal of Applied Polymer  Science 121 #5 (2011)

Sweeney, Naz and Coates of the University of Bradford, United Kingdom, found that strain rate sensitivity is a function of the strain.  This was related to a flow rule developed for this material in a previous study on compressive behavior. This flow rule is an adaptation of that of Hill, in which the anisotropy coefficients are power-law functions of the extension ratios.  It is used in conjunction with an Eyring process.  The observed rate dependence of the tensile behavior conformed with that obtained with the power-law flow rule and could be used to derive a value of the power-law coefficient.  A constitutive model was developed that incorporates the new flow rule and was implemented in a finite element analysis.  When this analysis was used to model the inhomogeneous tensile specimens, it gave predictions of the axial and transverse strain that were consistent with the experiment when the power-law coefficient was the same value as that derived from the study of the rate dependence.  (RDC 6/16/2011)

Effects of rice straw fiber morphology and content on the mechanical and thermal properties of rice straw fiber-high density polyethylene composites
(2900–2907)
Journal of Applied Polymer  Science 121 #5 (2011)

Influence of the die configuration on the gross melt fracture of linear polyethylene
(2812–2817)
Journal of Applied Polymer  Science 121 #5 (2011)

Flame-retardant synergism of sepiolite and magnesium hydroxide in a linear low-density polyethylene composite
(2772–2777)
Journal of Applied Polymer  Science 121 #5 (2011)

Processing, tensile, and fracture properties of injection molded Hdpe-Al2O3-HAp hybrid composites
(2500–2511)
Journal of Applied Polymer  Science 121 #5 (2011)

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6/14/2011

Product Yields and Compositions in the Continuous Pyrolysis of High-Density Polyethylene in a Conical Spouted Bed Reactor
(6650–6659)
Industrial & Engineering Chemistry Research 50 #11 (2011)

Elordi et al of the University of the Basque Country, Spain, studied the pyrolysis of high-density polyethylene (HDPE) between 500 and 700 °C in continuous mode in a pilot-plant unit equipped with a conical spouted bed reactor.  The products have been grouped into the lumps of gas (C4–), gasoline (C5–C11), diesel (C12–C20), and waxes (C21+). The results confirm the optimal performance of the conical spouted bed reactor (CSBR) in obtaining high yields of waxes and fuels with low aromatic content, which is explained by the appropriate conditions of the CSBR needed to enhance heat and mass transfer between phases (capacity for coating the sand with plastic) and minimize secondary reactions (short residence time of the volatiles). (RDC 6/14/2011)

High speed injection molding of high density polyethylene — Effects of injection speed on structure and properties
(456-464) Chinese Journal of Polymer Science 29, #4 (2011)

Copolymerization of ethylene and propylene catalyzed by magnesium chloride supported vanadium/titanium bimetallic Ziegler-Natta catalysts
(475-482) Chinese Journal of Polymer Science 29, #4 (2011)

Study on high weld strength of impact propylene copolymer/high density polyethylene laminates
(497-505) Chinese Journal of Polymer Science 29, #4 (2011)

Crystallization behavior of polylactide on highly oriented polyethylene thin films
(513-519) Chinese Journal of Polymer Science 29, #4 (2011)

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6/10/2011

Interparticle interaction and gel characterization of PE microgels using small- and large-strain viscoelastic response
(243-255)
Rheologica Acta 50  #3 (2011)

The combined effects of carbon black and carbon fiber on the electrical properties of composites based on polyethylene or polyethylene/polypropylene blend
(442-448)
Polymer Testing 30 #4 (2011)

Photoinitiated grafting polymerization of acrylic acid onto the surface of polyethylene under pulsed laser radiation
(171-175)
Polymer Science: Series B 53 3-4 (2011)

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6/9/2011

Study of the compositional heterogeneity of ethylene-1-hexene copolymers via thermal fractionation with the use of differential scanning calorimetry
(296-302)
Polymer Science: Series A 53 #4 (2011)

Studies on preparation of HDPE/CB composites including a novel oriented structure by the microwave heating and their characterization
(811–816)
Polymers for Advanced Technologies 22 #6 (2011)

Zhang et al of Sichuan University, China, studied the effects of microwave heating on the properties of high-density polyethylene/carbon black (HDPE/CB) composites.  The results show that the HDPE/CB composites can be heated via microwave irradiation, and composites with different CB concentration exhibit different microwave heatability.  The 20wt% CB composites have the most rapid heating rate, and its temperature reaches 78°C after 10sec, and 159°C after 150sec, respectively. Meanwhile, microwave heating improves the mechanical properties of HDPE/CB composites.  Scanning Electron Microscopy (SEM) analysis shows a better combination between CB particles and HDPE after microwave irradiation. Furthermore, selective heating of microwave was used to prepare a novel oriented structure, which the core layer has preferential orientation and the surface layer has little orientation.  (RDC 6/9/2011)

Binary and ternary blends of high-density polyethylene with poly(ethylene terephthalate) and polystyrene based on recycled materials
(690–702)
Polymers for Advanced Technologies 22 #5 (2011)

Mechanical properties, surface chemistry, and barrier characteristics of electron beam irradiated-annealed LDPE/PA6/LDPE multi-layer films at N2
(724–731)
Polymers for Advanced Technologies 22 #5 (2011)

Effect of Poly(methyl Methacrylate) Modified Water Hyacinth Fiber on Properties of Low Density Polyethylene/Natural Rubber/Water Hyacinth Fiber Composites
(898 – 906) )
Polymer - Plastics Technology and Engineering 50 #9 (2011)

Supri et al  of the Universiti Malaysia Perlis and the Universiti Sains Malaysia, Malaysia, studied the effect of poly(methyl methacrylate) modified water hyacinth fiber on properties of low density polyethylene (LDPE)/natural rubber (NR)/water hyacinth fiber (WHF) composites.  The poly(methyl methacrylate) modified water hyacinth fibers in LDPE/NR composites (LDPE/NR/WHF-PMMA) gave a greater value of tensile strength, Young's modulus, glass transition temperature (Tg), melting temperature (Tm), and % crystallinity compared to unmodified water hyacinth fibers in LDPE/NR composites (LDPE/NR/WHF).   (RDC 6/9/2011)

Analysis of Effect of Pressure and Heat on Mechanical Characteristics of Butt Fusion Welding of Polyethylene Pipes
(907 – 915)
Polymer - Plastics Technology and Engineering 50 #9 (2011)

Riahi,  Kooshayan and Ghanati of the Iran University of Science and Technology, Iran, conducted 9 different experiments with different heat and pressure conditions and equal timing for each heating stage.  Numerical modeling of Finite Element Method (FEM) of the heating process was carried out in the computer software considering governing physical conditions in the weld to determine heat distribution as well as primary bead geometry.  From mechanical strength perspective, the weld formed in 210°C and 0.18 MPa pressure demonstrated higher values. However, impact strength in the weld formed in 180°C was higher.  By reducing pressure in a specified heating process, value of impact energy required to break the piece was reduced. Mechanical strength in heating condition 240°C was lower than all other cases.  As for geometry of the formed bead; its size in 180°C and 0.03 MPa pressure in the first stage of the heating process was smaller than other cases.  (RDC 6/9/2011)

Effect of Cobalt Stearate on Natural Weathering of LLDPE/Soya Powder Blends
(957 - 968)
Polymer - Plastics Technology and Engineering 50 #9 (2011)

Sam, Ismail and Ahmad of Pulau Pinang, Malaysia, blended a protein-based natural polymer, soya powder, with linear-low density polyethylene (LLDPE). Cobalt stearate (CS) was used as a pro-oxidant.  The blends were exposed to natural weathering for 6 months. The susceptibility of the LLDPE/soya powder, based on its tensile properties, morphology, thermal behaviour and chemical and physical changes was measured every three months. The tensile strength and elongation at break (Eb) of the blends with CS were more susceptible compared to the blends without CS. During weathering, the crystallinity and weight loss increased with the addition of CS in the blends, however molecular weight was reduced.

Thermal, Mechanical and Electrical Properties of Linear Low-Density Polyethylene Composites Filled with Different Dimensional SiC Particles
(791 – 796)
 Polymer - Plastics Technology and Engineering 50 #8 (2011)

Morphological Study of Linear Low-Density Polyethylene Molded by Gas-Assisted Injection Molding
(804 – 809)
 Polymer - Plastics Technology and Engineering 50 #8 (2011)

Sun et al of Sichuan University, China, studied the position dependence for the supermolecular morphology of linear low density polyethylene (LLDPE) prepared by gas-assisted injection molding (GAIM) using scanning electron microscopy (SEM). Combined morphological feature of both spherulites and those with ring-bands was observed, which differs from our previous studies on the HDPE counterparts.. The difference in hierarchical crystalline structures between LLDPE and HDPE can be due to their different chain branches as well as the resultant different response to the local shear fields during the GAIM process.  (6/9/2011)

Soil Burial of Polyethylene-g-(Maleic Anhydride) Compatibilised LLDPE/Soya Powder Blends
(851 – 861)
 Polymer - Plastics Technology and Engineering 50 #8 (2011)

Sam, Ismail and Ahmad of the Universiti Sains Malaysia, Malaysia compared the composting of linear low density polyethylene (LLDPE)/soya powder blends to be used as alternatives to cellulosic material/polyolefin blends.  LLDPE was blended with soya powder in a Haake internal mixer by melt mixing.  Composition of the soya powder was varied from 5 wt% to 40 wt%.  Polyethylene grafted maleic anhydride (PE-g-MA) was used as a compatibiliser.  Environmental degradation was evaluated by composting the blends sample into the soil. It was found that for a higher soya powder composition, the degradation rate increased.  Blends with compatibiliser degraded at lower rates than the uncompatibilised blends.  The carbonyl indices of uncompatibilised blends subjected to the soil burial test were found to be higher than compatibilised blends. The weight loss changes in time data was collected and used to estimate the further changes by curve-fitting method. The complete degradation of the blends can be estimated from the kinetic curve. DSC results indicate that the crystallinity of the blends increased with increasing soya powder content added after composting.  (RDC 6/9/2011)

Characterization of Citric Acid-Modified Tapioca Starch and its Influence on Thermal Behavior and Water Absorption of High Density Polyethylene /Natural Rubber/Thermoplastic Tapioca Starch Blends
(748 – 753)
Polymer - Plastics Technology and Engineering 50 #7 (2011)

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6/8/2011

Dry Sliding Wear Properties of Ultra-high Molecular Weight Polyethylene Parts Made by the Injection Molding Process
(604 – 612)
Polymer - Plastics Technology and Engineering 50 #6 (2011)

Kuo and Jeng of the National Central University, Taiwan, studied the effects of various sliding wear test conditions on the tribological properties of UHMWPE.  The results indicated that the wear resistance of UHMWPE in the sliding direction perpendicular to the melt flow direction was stronger than that in the sliding direction parallel with the melt flow direction.  It was found that the X-Z plane obtains more serious incomplete molecular bondings and cracks than the Y-Z plane.  The main wear mechanisms were plastic deformations and wrinkled formations. The UHMWPE hardness increases or decreases as the applied load and sliding frequency increases or decreases.  (RDC 6/8/2011)

Significant increase in the melting temperature of poly(ε-caprolactone) blocks confined in the crystallized lamellar morphology of poly(ε-caprolactone)-block-polyethylene copolymers
(370-377)
Polymer Journal 43 #4 (2011
Abstract

Mechanical and surface properties of low-density polyethylene film modified by photo-oxidation
(398-406)
Polymer Journal 43 #4 (2011
Abstract

Evaluation of heat treatment regimes and their influences on the properties of powder-printed high-density polyethylene bone implant
(758–764)
Polymer International 60 #5 (2011)

Fracture behaviour of controlled-rheology ethylene–propylene block copolymers
(765–771)
Polymer International 60 #5 (2011)

6/7/2011

Analysis of natural degradation of high-density polyethylene lining using time-dependent properties
(1198–1205)
Polymer  Engineering &  Science 51 #6 (2011)

Effect of molecular structure and rheology on the compression foam molding of ethylene-α-olefin copolymers
(1145–1154)
Polymer  Engineering &  Science 51 #6 (2011)

Modelling of thermal oxidation of phosphite stabilized polyethylene
(1349-1360) Polymer Degradation and Stability 96 #7 (2011)

Kinetics of chlorine-induced polyethylene degradation in water pipes
(1361-1368) Polymer Degradation and Stability 96 #7 (2011)

Study of the degradation mechanisms of polyethylene during reprocessing
(1125-1133) Polymer Degradation and Stability 96 #6 (2011)

6/3/2011

Classification and identification of damage mechanisms in polyethylene self-reinforced laminates by acoustic emission technique
(945–959)
Polymer Composites 32 #6 (2011)

Effect of filler content and temperature on steady-state shear flow of wood/high density polyethylene composites
(796–809)
Polymer Composites 32 #5 (2011)

LDPE/EVA/PCR/MWNT nanocomposites: Radiation crosslinking and physicomechanical characteristics
(737–746)
Polymer Composites 32 #5 (2011)

Creep analysis of bamboo high-density polyethylene composites: Effect of interfacial treatment and fiber loading level
(692–699)
Polymer Composites 32 #5 (2011)

Effect of Ga modification on different pore size silicas in synthesis of LLDPE by copolymerization of ethylene and 1-hexene with [t-BuNSiMe2Flu]TiMe2/MMAO catalyst
(1301-1312)
Polymer Bulletin 66 #9 (2011)

Ethylene polymerization using fluorinated FI Zr-based catalyst
(1051-1062)
Polymer Bulletin 66 #8 (2011)

6/2/2011

The use of an interleaved film for optimising the properties of hot compacted polyethylene single polymer composites
(2891-2898) Polymer 52 #13 (2011)

Hine, Unwin, and Ward of the University of Leeds, and the University of Bradford, United Kingdom, showed that the incorporation of interleaved films has major advantages for the production of polyethylene single polymer composites by the process of selective melting (termed hot compaction).  The key issue is to choose a compaction temperature which melts the minimum amount of the original oriented elements whilst achieving acceptable bonding within the compacted structure.  Utilising an interleaved film, excellent interlayer peel strengths can be achieved at lower compaction temperatures giving greater retention of the oriented fraction of the original fibres or tapes and a wider processing window.  For example, using a very high modulus, ultra-high molecular weight, polyethylene tape, together with an interleaved film, resulted in an in-plane modulus of 25 GPa, an in-plane strength of 500 MPa, and an interlayer strength of >10 N/10 mm. These are amongst the highest values reported for a single polymer composite.   (RDC 6/2/2011)

Branch length distribution in TREF fractionated polyethylene
(2661-2666) Polymer 52 #12 (2011)

Effect of nano inclusions on the structural and physical properties of polyethylene polymer matrix
(2310-2318) Polymer 52 #10 (2011)

6/1/2011

Development of novel chromium oxide/metallocene hybrid catalysts for bimodal polyethylene
(1891-1899) Polymer 52 #9 (2011)

Effect of wood particle size on mechanical properties of industrial wood particle-polyethylene composites (in English)
Polimery #5 (2011)

Gozdecki et al, Poland, used industrial wood particles for particleboards to prepare wood/PE-LD composites by an injection molding process.  The effect of particle size (sieve analysis 0.25—0.5, 0.5—1, 1—2, and 2—4 mm) and of specimen cross-section size (40, 90 and 160 mm2) on the mechanical properties was studied. Both these factors significantly influenced studied properties. The tensile, flexural and impact strengths properties in general increased with increasing particle size while with increasing of specimen cross-section the tensile and flexural moduli increased, and the tensile, flexural and impact strengths decreased. (RDC 6/1/2011)

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May 2011

5/27/2011

FT-IR Image Processing Algorithms for In-Plane Orientation Function and Azimuth Angle of Uniaxially Drawn Polyethylene Composite Film
(3950–3957)
Macromolecules 44 #10 (2011)

Analytical Rheology of Metallocene-Catalyzed Polyethylenes
(3656–3665)
Macromolecules 44 #9 (2011)

5/26/2011

Self-Nucleation of Polymers with Flow: The Case of Bimodal Polyethylene
(2926–2933)
Macromolecules 44 #8 (2011)

Disklike Micelles in Water from Polyethylene-Containing Diblock Copolymers
(3021–3028)
Macromolecules 44 #8 (2011)

Plastic Deformation of Semicrystalline Polyethylene by Molecular Simulation
(3096–3108)
Macromolecules 44 #8 (2011)

Chain Dynamics of Unentangled Poly(ethylene-alt-propylene) Melts by Means of Neutron Scattering and Fully Atomistic Molecular Dynamics Simulations
(3129–3139)
Macromolecules 44 #8 (2011)

Electroconductive Polyamide 6/MWNT Nanocomposites: Effect of Nanotube Surface-Coating by in situ Catalyzed Polymerization
(408–413)
Macromolecular Materials and Engineering 296 #5 (2011)

Gorrasi  et al Italy, Belgium and France, analyzed morphologic and electrical properties of high-performance multiwalled carbon nanotube/polyamide 6 nanocomposites.  The MWNTs were surface-coated by in situ polymerization of ethylene as catalyzed directly from the nanotube surface previously treated by a highly active metallocene-based complex.  The so-produced polyethylene-coated MWNTs were melt-mixed with the PA6 matrix.  Pristine MWNTs were also dispersed in PA6. The in situ ethylene polymerization/coating reaction allowed the destructuring of the native bundle-like aggregates leading to the preparation of nanocomposites with improved properties even at very low nanofiller content.  (RDC 5/26/2011)

Shape Recovery Versus Breakup of Deformed Droplets in a Polymer Blend after Uniaxial Extension
(414–422)
Macromolecular Materials and Engineering 296 #5 (2011)

Starý, Musialek and Münstedt of the Friedrich-Alexander-University Erlangen-Nuremberg, Germany, investigated the morphology development in a PS/LLDPE 95/5 blend after uniaxial elongation at constant stress is investigated with a special attention on the influence of the temperature on the competition between shape recovery and droplet breakup.  The lower the recovery temperature, the finer the morphology obtained, i.e. fibril breakup was preferred against shape recovery.  This is due to a stronger retraction of matrix molecules at higher temperatures in early stages of recovery which forces the fibrils to shrink back to less deformed states and thus suppresses the droplet breakup.  The elasticity of the blend was found to increase with temperature although the elasticity of pure PS is temperature independent. This is explained as a consequence of the temperature dependence of the morphology development.  (RDC 5/26/2011)

Silver Nanoparticles in Blends of Polyethylene and a Superabsorbent Polymer: Morphology and Silver Ion Release
(423–427)
Macromolecular Materials and Engineering 296 #5 (2011)

Stará, Starý and Münstedt of the Friedrich-Alexander-Universitä, Germany, and the Institute of Macromolecular Chemistry, Czech Republic, studied the morphology of polyethylene/superabsorbent polymer blends (PE/SAP) containing silver nanoparticles formed in situ.  The silver nanoparticles are preferentially located on the surface of SAP particles.  Contrary to the expectations, the silver ion release is markedly suppressed by the addition of SAP, which is explained by the preferential sorption of silver ions by the SAP particles.   (RDC 5/26/2011)

Characterisation of the Chemical Composition Distribution of LLDPE Using Interactive Liquid Chromatography
(959–970)
Macromolecular Chemistry and Physics 212 #9 (2011)

Dolle et al of LyondellBasell and the German Institute for Polymers, Germany, showed that copolymers of ethylene with higher 1-olefins can be separated using bare silica gel as the stationary phase and a gradient of ethylene glycol monobutyl ether and 1,2,4-trichlorobenzene as the mobile phase at 160°C.  The separation of ethylene 1-hexene copolymers according to their composition is confirmed by linking the chromatographic separation to infrared spectroscopy. Using well-characterised model fractions from temperature rising elution fractionation or solvent/non-solvent fractionation (“Holtrup”), it can be shown that both the content and type of the comonomer mainly govern the elution in two peaks which differ in their comonomer content. The molar mass only plays a subordinate rule.  (RDC 5/26/2011)

5/25/2011

Novel Dinuclear Half-Titanocene-Producing Styrene/Ethylene Copolymers Containing Syndiotactic Styrene/Styrene Sequences
(785–789)
Macromolecular Chemistry and Physics 212 #8 (2011)

Yoon et al, South Korea, synthesized a titanium complex, {[C5(CH3)5]ClTi}2O2C2(CH3)4(µ-O) (2), which has two titanium metal centers linked by heteroleptic bridges, oxo and pinacolato, is described.  The compound shows good stability under air. The 2/modified methylalumoxane (MMAO) catalytic system produces ethylene/styrene interpolymers (ESIs) containing syndiotactic styrene/styrene sequences (syndiotactic polystyrene blocks) with a high styrene content.  (RDC 5/25/2011)

Estimation of Elongation Viscosity of Polyethylene Melts
(367-376) Journal of Thermoplastic Composite Materials 24 #3 (2011)
Abstract

Liang and Zhong of South China University of Technology,, China, introduced temperature T into H function which represents the destruction rate of network junctions and a new viscosity equation was derived based on Phan-Thien—Tanner model for extensional flow. The elongation viscosities of a high-density polyethylene (HDPE) and a low-density polyethylene (LDPE) melts were estimated using this equation at 150°C, and the calculations were compared with the measured data from the extension experiments of the HDPE and LDPE melts reported in reference. Good agreement was showed between the predictions and the measured data. Furthermore, the parameters in this equation were easy to be determined.  (RDC 5/25/2011)

Studying the effect of fiber size and fiber loading on the mechanical properties of hybridized kenaf/PALF-reinforced HDPE composites
(546-553) Journal of Reinforced Plastics and Composites 30 #6 (2011)
Abstract

Zainudin et al of the Universiti Putra Malaysia and the Malaysian Nuclear Agency, Malaysia, studied the tensile, flexural, and impact properties of hybridized kenaf/PALF-reinforced HDPE composite. All specimens were prepared at a fiber ratio of 1:1 kenaf:PALF and fiber lengths of 0.25, 0.5, 0.75, and 2 mm; fiber loadings of between 10% and 70% were utilized for the study.. Moduli results of all the composites formulated generally obeyed the Rule of Mixtures. Tensile and impact strengths result showed inverse proportionality while flexural strength of the composite generally adhered to the Rule of Mixtures.  However, a positive effect was observed in the case of composite’s impact strength in respect of increasing fiber length.  Thus, reduction in some mechanical properties of the composite with respect to increasing fiber length is attributed more to fiber entanglement rather than attrition.   (RDC 5/25/2011)

5/24/2011

Effects of Roller Speed, Die Temperature, Volumetric Flow Rate, and Multiple Extrusions on Mechanical Strength of Molten and Solidified LDPE under Tensile Deformation
(1074 – 1086) Journal of Macromolecular Science, Part B - Physics 50  #6 (2011)

Harnnarongchai; Intawong and Sombatsompop, Thailand, developed an experimental rig coupled with a high speed data-logging and recording system and a personal computer for the real-time measurement of mechanical strength (in terms of drawdown force) as a function of volumetric flow rate and roller speed for virgin low-density polyethylene (LDPE) and reprocessed LDPE during a filament stretching process.  The effect of the number of extrusion passes for the reprocessed LDPE was our main interest.  The experimental rig was connected to the end of a single-screw extruder, which was used to melt and extrude the polymers.  The LDPE filaments were then solidified and collected for studying the mechanical properties.  The mechanical strength of the virgin LDPE and reprocessed LDPE were investigated in both molten and solidified states. The mechanical strengths of the virgin and reprocessed LDPEs under these two states are discussed and compared in terms of change in magnitude under a wide range of processing conditions (volumetric flow rate, die temperature, and roller speed). The results suggested that in the molten state the drawdown force for LDPE melts was dependent on volumetric flow rate, die temperature, roller speed, and the number of reprocessing passes. The drawdown force being affected by the number of reprocessing passes could be explained by molecular degradation and gelation effects when using high volumetric flow rates. In the solidified state, the tensile properties of the solidified LDPE increased with roller speed. The effect of the number of extrusion passes for the solidified LDPE was similar to that for the molten LDPE. In the case of volumetric flow rates, the mechanical properties of the solidified LDPE decreased with increasing volumetric flow rate, whereas those of the molten LDPE exhibited the opposite effect. Thus, the mechanical strength of the molten LDPE could not always be used to assess the mechanical properties of the solidified LDPE.  (RDC 5/24/2011)

Study on the Rheological Behavior of the Polyethylene/Polypropylene Blend Nanocomposites
(1087 – 1097) Journal of Macromolecular Science, Part B - Physics 50  #6 (2011)

Aalaie; Dashtaki and Hemmati of the Research Institute of Petroleum Industry, Iran, prepared high-density polyethylene (HDPE)/polypropylene (PP)/organically modified montmorillonite (OMMT) nanocomposites via melt mixing in an internal mixer. X-ray studies revealed the presence of intercalated structure for the prepared nanocomposites and good dispersion of clay layers at low levels of loading. From the rheological investigation, it was observed that the prepared nanocomposites and their pristine counterpart have shear-thinning behavior.  At low shear rates, the steady shear viscosity and shear stress of the blend nanocomposites increased with increasing nanoclay content. Flow activation energy for the blend nanocomposites was calculated using an Arrhenius-type equation. The activation energy of flow decreased with increasing nanoclay content. Viscosity of blend nanocomposites exhibited negative deviation from the logarithmic additive rule.  (RDC 5/24/2011)

5/23/2011

Effect of Elastomer on Flame Retardancy, Thermal Degradation, and Mechanical Properties of Intumescent Flame-Retardant Polyethylene
(257-273)
Journal of Elastomers and Plastics 43 #3 (2011)
Abstract

Measurement of the variation of crystal lattice structures of ethylene copolymers with high-resolution cryogenic FTIR spectroscopy
(2072–2077)
Journal of Applied Polymer  Science 121 #4 (2011)o

Mechanical and thermal properties of calcium carbonate-filled PP/LLDPE composite
(2413–2421)
Journal of Applied Polymer  Science 121 #4 (2011)

Ghalia, Hassan and Yussuf, Malaysia and Libya, studied the mechanical properties, melting, glass transition, and crystallization behavoir of 80 phr polypropylene (PP) with varying weights of linear low density polyethylene (LLDPE) at 10, 20/ 20 wt % CaCO3, 30, 40, and 50 phr.  It has been confirmed that increasing the LLDPE content trends to decreases the tensile strength and flexural strength. However, increasing the LLDPE content led to increases in the impact strength of PP/LLDPE blends. It was also found that up to 40 phr the corresponding melting point (Tm) was not effected with increasing LLDPE content. Each compound has more than one Tg, which was informed that there is a brittle-ductile transition in fracture nature of these blends, the amount of material plastically deformed on the failure surface seems to increase with the increasing the LLDPE content. And PP/LLDPE blends at temperature (23°C) showed a ductile fracture mode characterized by the co-existence of a shear yielding process; whereas at lower temperature (−20°C) the fractured surfaces of specimens appear completely.  (RDC 5/23/2011)

Formation and Biodegradation of Polyethylene-based Electret Films
(205-211)  
International Polymer Processing #2 (2011)

Goldade et al, Belarus, showed that the kinetics of biodestruction of polyethylene films, including starch-filled and inorganic saltfilled ones, alters significantly after such film transfer to electret state.  (RDC 5/23/2011)

Periodic Switching of Monomer Additions for Controlling the Compositions and Microstructures of Segmented and Random Ethylene-Propylene Copolymers in Polypropylene in-Reactor Alloys
(5992–5999)
Industrial & Engineering Chemistry Research 50 #10 (2011)

Tian et al, China and France, studied the mechanisms that dictate the composition and microstructure of polypropylene/poly(ethylene-co-propylene) (PP/EPR) in-reactor alloys produced by the multizone circulating reactor (MZCR) technology, a novel one for polyolefin production.  For this purpose, this technology is simulated by a batch process with periodic switching of monomer additions.  An increase in the switch frequency leads to a decrease in the fraction of ethylene/propylene random (amorphous) copolymers denoted as EPR and an increase in the fraction and the length of PP segments of ethylene/propylene segmented (partially crystalline) copolymers denoted as EPS.  Concomitantly, the size of the dispersed phase domains (EPR) decreases, and its size distribution becomes more uniform as a result of the decrease in the fraction of the EPR and the increase in that of the EPS which acts as a compatibilizer for PP/EPR in-reactor blends. Mechanical properties of the PP/EPR in-reactor blends are also discussed.  (RDC 5/23/2011)

Continuous Process for Recycling Silane Cross-Linked Polyethylene Using Supercritical Alcohol and Extruders
(5661–5666)
Industrial & Engineering Chemistry Research 50 #9 (2011)

Goto et al, Japan, developed a continuous process using extruders in a pilot plant for recycling silane cross-linked polyethylene (silane-XLPE) via chemical reaction in supercritical alcohol.  As a first step, an autoclave was employed to reveal the effects of temperature and pressure on the reaction that selectively decomposes the siloxane cross-linking bonds.  Selective decomposition of the siloxane bond was found to occur in the supercritical alcohol.  In the next step, an extruder was used to continuously feed silane-XLPE into a tube reactor containing supercritical alcohol.  Silane-XLPE was then extruded with an injection of supercritical alcohol.  Alcohol remained in the supercritical state inside the cylinders of the extruder and the tube reactor.  The recycled polyethylene (PE) was continuously extruded from the reactor at a rate of 14 kg/h.  The product produced by this continuous process was the same as that from the autoclave. The mechanical properties of the recycled PE satisfied the requirements for use as a wire and cable insulation material.  (RDC 5/23/2011).

5/17/2011

Crystal structure of ethene-/α-olefin copolymers with various long comonomers (C8–C26)  
(
1048-1053) European Polymer Journal 47  #5 (2011)

Stadler, Takahashi and Yonetake of Friedrich-Alexander-University Erlangen-Nürnberg, Germany, Yamagata University, Japan and Chonbuk National University, South Korea, studied ethene-/α-olefin copolymers having a wide range of comonomers between 8 and 26 carbon atoms in length were characterized by wide angle X-ray diffraction (WAXD). It was found that the crystallinities for the shorter comonomers (C8, C12) matched fairly well with the crystallinities from DSC and volumetric measurements, while for the longer comonomers (C18, C26) distinct differences between the three methods were found. This was explained by the presence of an additional crystalline phase of the side chains slightly deforming the amorphous peak. (RDC 5/17/2011)

041[2011]  Polymerization of ethylene using a nickel alpha-diimine complex covalently supported SiO2-MgCl2 bisupport
e-Polymers (5/17/2011) (46)
[Abstract]

Effect of Silicon Carbide Nanoparticle Additions on Microstructure and Mechanical Behavior of Maleic Anhydride Compatibilized High Density Polyethylene Composites
(107-120) Composite Interfaces 18 #2 (2010)

Liao, Bao and Tjong, of City University of Hong Kong, China, prepared maleated high density polyethylene (mPE) loaded with 2, 4, 6 and 8 wt% SiC nanoparticles (SiCnp) by injection molding.  The effect of SiCnp additions on the microstructure and mechanical properties of mPE were studied using X-ray diffraction (XRD), polarizing optical microscopy (POM), heat deflection temperature (HDT), tensile and Izod impact measurements. XRD and POM results showed that the SiCnp additions reduce the crystallite thickness and spherulite size of mPE. HDT measurements revealed that SiCnp additions enhance the thermal stability of mPE considerably. Tensile test showed that the addition of 2 wt% SiCnp improves the Young's modulus and yield strength of mPE at the expenses of elongation at break and impact strength.  The low impact strength of mPE/SiCnp nanocomposites was related to the absence of particle cavitation and matrix fibrillation.  (RDC 5/17/2011)

HDPE solution crystallization induced by electrospun PA66 nanofiber
(843-849) Colloid and Polymer Science 289 #7 (2011)

Han et al fabricated nanohybrid shish–kebab (NHSK), induced by polyamide 66 (PA66) nanofiber, was successfully fabricated in high-density polyethylene (HDPE)/xylene solution via isothermal crystallization.  In the structure of NHSK, PA66 nanofiber serves as shish and HDPE lamellae act as kebabs periodically surrounding the nanofiber. Additionally, it reveals that both HDPE solution concentration and crystallization time have significant effects on the size of HDPE kebab. That is, as the concentration and crystallization time increase, the diameter of the kebab increases. Moreover, when crystallization time further increases, the crystals decorated on PA66 nanofiber exhibit a three-dimensional growth (i.e., aggregate of crystallites) rather than a two-dimensional one (i.e., disk-like lamellae normal to the axis of nanofiber).  (RDC 5/17/2011)

5/16/2011

Effects of matrix molecular weight on structure and reinforcement of high density polyethylene/mica composites
(377-369)  Chinese Journal of Polymer Science 29, #3 (2011)

Chen et al of Sichuan University, China, studied three types of high-density polyethylene (HDPE) with different molecular weights (high, medium and low) to evaluate the influence of matrix molecular weight on the structure-property relation of injection-molded HDPE/mica composites through a combination of SEM, 2d-WAXS, DSC, DMA and tensile testing.  The transcrystallization of HDPE on the mica surface was observed and it exhibited strong matrix molecular weight dependence. Obvious transcrystalline structure was found in the composite with low molecular weight HDPE, whereas it was hard to be detected in the composites with increased HDPE molecular weight.  The best reinforcement effect in the composite with low molecular weight HDPE can be understood as mainly due to substantially improved interfacial adhesion between matrix and mica filler, which arises from the transcrystallization mechanism.  (RDC 5/16/2011)

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April 2011

4/22/1011

Effects of Waste Paper Sludge on the Physico-Mechanical Properties of High Density Polyethylene/Wood Flour Composites
(120-124)

Hamzeh, Ashori and Mirzaei of the University of Tehran and Iranian Research Organization for Science and Technology, Iran, found that the flexural properties of the composites were positively affected by the addition of the sludge. Especially, tensile modulus improved with the increase of paper sludge content. With the addition of the coupling agent , flexural properties improved considerably compared with control specimens (without any coupling agent).  The results showed that the water absorption (WA) and thickness swelling (TS) values of the samples decreased considerably with increasing sludge content in the composite, while they increased with increasing wood flour content.  Overall results suggest that the waste paper sludge materials were capable of serving as feasible reinforcing fillers for thermoplastic polymer composites.  (RDC 4/22/2011)

Effect of Lignocellulosic Type on Long-Term Hygroscopic Behavior of Natural Filler/HDPE Composites
(133-132)
Journal of Polymers and the Environment 19 #1 (2011)

Zabihzadeh of the Sari Agricultural Sciences and Natural Resources University, Iran, prepared natural filler/high density polyethylene (HDPE) injection-molded composites of flour from different lignocellulosic sources and studied their long-term water absorption and thickness swelling.  Filler samples from wheat straw, hybrid Euro-American poplar, and loblolly pine were mixed with the matrix at 35 wt% lignocellulosics content and either zero or 2% maleic anhydride grafted polyethylene (MAPE) as compatibilizer. Results indicated water absorption of all the composites followed the kinetics of a Fickian diffusion process.  The wheat straw composites showed the highest and the pine composites exhibited the lowest water absorption coefficients.  (RDC 4/22/2011)

4/18/2011

Rheological behaviors and molecular weight distribution characteristics of bimodal high-density polyethylene
(1543–1549)
 Journal of Applied Polymer  Science 121 #3 (2011)

Shen et al of Sichuan University, China, prepared a series of bimodal high density polyethylene (PE) with different molecular weight distributions (MWDs) by melt blending.  The results showed that homogeneous bimodal high density PEs could be successfully prepared via melt blending, and the bimodal characteristic could be adjusted as expected.   (RDC 4/18/2011)

4/16/2011

Modeling of solid–liquid equilibria for polyethylene and polypropylene solutions with equations of state
(1832–1849)
 Journal of Applied Polymer  Science 121 #3 (2011)

Costa et al of the Universidade Federal da Bahia and the Universidade Federal do Rio de Janeiro, Brazil, modeled solid–liquid equilibria (SLEs) in polyethylene and polypropylene solutions with a Soave–Redlich–Kwong (SRK) cubic equation of state (EOS) and a perturbed-chain statistical associating fluid theory (PC-SAFT) EOS. Two types of mixing rules were used with SRK EOS: The Wong–Sandler mixing rule and the linear combination of the Vidal and Michelsen mixing rules (LCVM), both of which incorporated the Bogdanic and Vidal activity coefficient model. The performance of these models was evaluated with atmospheric-pressure and high-pressure experimental SLE data obtained from literature. The basic SLE equation was solved for the equilibrium melting temperature instead of for the composition. The binary interaction parameters of SRK and PC-SAFT EOS were estimated to best describe the experimental equilibrium behavior of 20 different polymer–solvent systems at atmospheric pressure and 31 other polymer–solvent systems at high pressure. A comparison with experimental data showed that SRK–LCVM agreed very well with the atmospheric SLE data and that PC-SAFT EOS was more efficient in high-pressure conditions.  (RDC 4/16/2011)

Biodegradable blends based on chitin and chitosan: Production, structure, and properties
(1850–1859)
 Journal of Applied Polymer  Science 121 #3 (2011)

Rogovina, xanyan and Prut of the Russian Academy of Sciences, Russia, prepared blends based on LDPE and chitin or chitosan were prepared under high-temperature shear deformations in a rotor disperser at different initial ratios of the components. Adding poly(ethylene oxide) improves biodegradability.  (RDC 4/16/2011)

4/14/2011

Influence of chain microstructure on ethylene–norbornene copolymer film properties
(707–710)
Journal of Applied Polymer  Science 121 #2 (2011)

Liu et al of Zhejiang University, Canada and McMaster University, Canada, found that the transparency is mainly determined by the copolymer composition distribution. The samples having uniform compositions gave better transparency. However, the copolymer composition distribution had little effect on refractive index. The refractive index increased linearly with increasing norbornene content. Furthermore, the incorporation of polar α-olefin with long carbon chain improved refractive index and hydrophilicity of the films.  (RDC 4/15/2011)

Structure and properties of PP/POE/HDPE blends
(1013–1022)
Journal of Applied Polymer  Science 121 #2 (2011)

Chen and Ye of Sichuan University, China, showed that addition of HDPE resulted in an increasing wide stress plateau and more ductile fracture behavior. With the increase of HDPE content, the elongation at break of the blends increased rapidly without obvious decrease of yield strength and Young's modulus, and the notched izod impact strength of the blends can reach as high as 63 kJ/m2 at 20 wt % HDPE loading. The storage modulus of PP blends increased and the glass transition temperature of each component of the blends shifted close to each other when HDPE was added. The crystallization of HDPE phase led to an increase of the total crystallinity of the blend. With increasing HDPE content, the dispersed POE particle size was obviously decreased, and the interparticle distance was effectively reduced and the blend rearranged into much more and obvious core-shell structure. The fracture surface also changed from irregular striation to the regularly distant striations, displaying much obvious character of tough fracture.  (RDC 4/15/2011)

Synthesis of double silylene-bridged binuclear metallocenes and their cooperation effect during ethylene polymerization and ethylene/1-hexene copolymerization
(21–26)
Journal of Applied Polymer  Science 121 #1 (2011)

(RDC 4/14/2011)

Effects of charge trapping on the electrical conductivity of low-density Polyethylene–Carbon black composites
(138–143)
Journal of Applied Polymer  Science 121 #1 (2011)

Dudić et al of University of Belgrade, Serbia and University of Banja Luka, Bosnia and Herzegovina showed a percolation threshold at about 20 wt % of CB content, whereas AC measurements show two conductivity peaks at about 15% and 23% of CB content. The presence of two percolation thresholds was attributed to different dispersions of CB particles in structural inhomogeneities of LDPE.   (RDC 4/14/2011)

Cross-linking of ethylene-octene copolymer (EOC) by dicumyl peroxide (DCP)
(521–530)
Journal of Applied Polymer  Science 121 #1 (2011)

Svoboda et al of Czech Republic and Japan crosslinked ethylene-octene copolymer (EOC) by dicumyl peroxide (DCP) at various temperatures (150–200°C).  From rubber process analyzer (RPA) data analysis real part modulus s', tan δ, and reaction rate were investigated as a function of peroxide content and temperature. The highest s'max and the lowest tan δ were found for 0.7% of DCP at 150°C.  Less susceptible to chain scission are temperatures in range 150–170°C and peroxide levels 0.2–0.5%. Heat of reaction was analyzed by DSC at various heating rates (5–40°C min−1). It was found to be exothermic. By projection to zero heating rate, the reaction was found to start at 128°C with the maximum at 168°C.  (RDC 4/14/2011)

4/13/2011

In Situ Fabrication of Surface Modified Lead Monoxide Nanopowder and Its HDPE Nanocomposite
(4478–4483)
Industrial & Engineering Chemistry Research 50 #8 (2011)

Uhm et al of the Korea Atomic Energy Research Institute, South Korea, fabricated low density polyethylene (LDPE) coated lead monoxide (PbO) nanopowder by using in situ high energy wet ball milling.  PbO powder could be pulverized to 100 nm for 1 h milling while the surfaces of the powder particles were modified with LDPE simultaneously.  High density polyethylene (HDPE) nanocomposites were also prepared by dispersing micro- and nano-PbO/LDPE powders using a polymer melting mixer. Dispersion and adhesion of PbO/LDPE nanoparticles in or with the polymer matrix were homogeneous and strong respectively according to the SEM images as well as the FTIR spectra, while the HDPE nanocomposites show higher mechanical properties than those for micro-PbO powder dispersed ones.  (RDC 4/13/2007)

Effects of matrix molecular weight on structure and reinforcement of high density polyethylene/mica composites
(377-389)  
Chinese Journal of Polymer Science 29, #2 (2011)

Chen et al of Sichuan University, China, studied high, medium and low molecular weight HDPE resins to evaluate the influence of matrix molecular weight on the structure-property relation of injection-molded HDPE/mica composites.  The transcrystallization of HDPE on the mica surface was observed and it exhibited strong matrix molecular weight dependence.  Obvious transcrystalline structure was found in the composite with low molecular weight HDPE, whereas it was hard to be detected in the composites with increased HDPE molecular weight. The best reinforcement effect in the composite with low molecular weight HDPE can be understood as mainly due to substantially improved interfacial adhesion between matrix and mica filler, which arises from the transcrystallization mechanism.  (RDC 4/13/2011)

4/7/2011

Cold Plasma Surface Treatment of UHMWPE Membranes to Improve Fouling Characteristics
(466 – 473) Polymer - Plastics Technology and Engineering 50 #5 (2011)

Leal et al, Brazil, modified UHMWPE membrane internal surface by methane cold plasma treatment for 60 min.  Fouling was reduced after plasma modification and that the effect was more pronounced for the membranes prepared with the sieved UHMWPE powder.  This behavior was associated to the increased surface tension (after plasma modification) leading to solid particle repulsion by the membrane surfaces and to a better plasma surface modification on the smaller grain sizes displayed by the membranes prepared with the #200 mesh sieved UHMWPE powder. Two sets of sintered tubular UHMWPE membranes were manufactured. One set of membranes was prepared with as-received powdered UHMWPE and another set was prepared with the same powder sieved through #200 mesh. The tubular membranes were obtained by sintering the UHMWPE powders at 180°C for 130 min.  (RDC 4/7/2011)

Stability of model recycled mixed plastic waste compatibilised with a cooperative compatibilisation system  
(
751-755)
Polymer Degradation and Stability 96 #5 (2011)

Luzuriaga and Fortelný of Masaryk University and the Academy of Sciences of the Czech Republic, Czech Republic studied the effect of the degree of degradation of the components of a model municipal plastic waste (a mixture of low-density polyethylene, high-density polyethylene, polypropylene and high-impact polystyrene) on the toughness and stability of recyclates compatibilised with a cooperative compatibilisation system (a mixture of ethylene–propylene statistical and styrene–butadiene block copolymers with a secondary amine-based stabiliser).  It was shown that good impact strength was achieved for recyclates having components with a low or medium degree of degradation. Mechanical properties of recyclates having the components with a high degree of degradation are deteriorated. The addition of the cooperative compatibilisation system leads to a higher thermo-oxidative stability of recyclates irrespective of the degree of degradation of their components. Photo-oxidative stability of the recyclates is low but it can be improved to a satisfactory level by the addition of carbon black or a commercial photo-stabiliser.  (RDC 4/7/2011)

Deterioration of polyethylene pipes exposed to water containing chlorine dioxide  
(
790-797)
Polymer Degradation and Stability 96 #5 (2011)

Azhdar, et al of the Royal Institute of Technology, Exova and Borealis, Sweden, pressure-tested medium-density polyethylene pipes stabilized with hindered phenol and phosphite antioxidants with water containing 4 ppm chlorine dioxide at 90 °C and pH = 6.8 as internal medium.  The stabilizers were rapidly consumed towards the inner pipe wall; the rate of consumption was four times greater than in chlorinated water (4 ppm, pH = 6.8) at the same temperature. The depletion of stabilizer occurred far into the pipe wall.  The subsequent polymer degradation was an immediate surface reaction. In the surface layer which came into contact with the oxidising medium, the amorphous component of the polymer was heavily oxidized leaving a highly crystalline powder with many carboxylic acid chain ends in extended and once-folded chains. Scanning electron microscopy showed that propagation of cracks through the pipe wall was assisted by polymer degradation.  (RDC 4/7/2011)

Kinetics of abiotic and biotic degradability of low-density polyethylene containing prodegradant additives and its effect on the growth of microbial communities  
(
919-928)
Polymer Degradation and Stability 96 #5 (2011)

Jakubowicz, Yarahmadi and Arthurson of the SP Technical Research Institute of Sweden, Sweden, studied the kinetics of abiotic oxidation in the dark and the kinetics of biological mineralization in soil and in a compost environment of thermally oxidized LDPE.  Significantly higher levels of biodegradability have been obtained in a soil environment at 23 °C compared with the compost environment at 58 °C. After two years of mineralization, 91% conversion to carbon dioxide was obtained in the soil test, compared with 43% in the compost test.  It was found that the most dominant bacterial and fungal terminal restriction fragments (TRFs) in the compost containing the test material are significantly different from the TRFs in the other environments.  (RDC 4/7/2011)

4/6/2011

On the action of ozone at high concentration on various grades of polyethylene and certain straight chain paraffins  
(
955-964)
Polymer Degradation and Stability 96 #5 (2011)

Cataldo et al, Italy, functionalized UHMWPE (ultra high molecular weight polyethylene) by ozone action (10% by weight in oxygen) under mild conditions.  The ozone attacks and oxidizes the amorphous phase of UHMWPE preserving the crystalline phase because after the ozone treatment there was an increase in the % of crystallinity.  (RDC 4/6/2011)

High thermal conductivity of polyethylene nanowire arrays fabricated by an improved nanoporous template wetting technique  
(1711-1715) Polymer 52 #8 (2011)

Cao et al , China, show that an improved nanoporous template wetting technique can prepare thermally conductive polymer nanowire arrays.  The thermal conductivities of the fabricated high-density polyethylene (HDPE) nanowire arrays with diameters of 100 nm and 200 nm, measured by a laser flash method, are about 2 orders of magnitude higher than their bulk counterparts. The estimated thermal conductivity of a single HDPE nanowire is as high as 26.5 W/mK at room temperature. The high orientation of chains of the HDPE nanowires may arise from the integrative effects of shear rate, vibrational perturbation, translocation, nanoconfinement and crystallization. Findings in this study provide useful strategies on enhancing the intrinsic thermal properties of polymer nanostructures.  (RDC 4/6/2011)

Graphene/polyethylene nanocomposites: Effect of polyethylene functionalization and blending methods  
(
1837-1846) Polymer 52 #8 (2011)

Kim et al of the University of Minnesota, Minnesota, and The Petroleum Institute, United Arab Emirates, blended thermally reduced graphene oxide (TRG) via melt and solvent blending with linear low density PE (LLDPE) and its functionalized analogs (amine, nitrile and isocyanate) produced using a ring-opening metathesis polymerization (ROMP) strategy.  TRG was well exfoliated in functionalized LLDPE while phase separated morphology was observed in the un-modified LLDPE.  Transmission electron micrographs showed that solvent based blending more effectively dispersed these exfoliated carbon sheets than did melt compounding. Tensile modulus was higher for composites with functionalized polyethylenes when solvent blending was used.  (RDC 4/6/2011)

4/5/2011

Chain Dynamics of Ring and Linear Polyethylene Melts from Molecular Dynamics Simulations
(2311–2315)
Macromolecules 44 #7 (2011)

Hur et al, South Korea, Germany and California, studied the dynamical characteristics of ring and linear polyethylene (PE) molecules in the melt using atomistic molecular dynamics simulations for linear PEs with carbon atom numbers N up to 500 and rings with N up to 1500.  The single-chain dynamic structure factors S(q,t) from entangled linear PE melt chains, which show strong deviations from the Rouse predictions, exhibit quantitative agreement with experimental results.  Ring PE melt chains also show a transition from the Rouse-type to entangled dynamics, as indicated by the characteristics of S(q,t) and mean-square monomer displacements g1(t). For entangled ring PE melts, we observe g1(t) t0.35 and the chain-length dependence of diffusion coefficients DN N−1.9, very similar to entangled linear chains. Moreover, the diffusion coefficients DN remain larger for the entangled rings than the corresponding entangled linear chains, due to about a 3-fold larger chain length for entanglement. Since rings do not reptate, our results point toward other important dynamical modes, based on mutual relaxations of neighboring chains, for entangled polymers in general.  (RDC 4/5/2011)

Effects of Lubricant Content on Extrusion Processing and Mechanical Properties of Wood Flour-High-density Polyethylene Composites
(155-171)
Journal of Thermoplastic Composite Materials 24 #2 (2011)
Abstract

Adhikary et al of the University of Toronto and University of Ontario Institute of Technology, Canada, produced rectangular wood composite profiles with varied high-density polyethylene (HDPE), wood fiber (WF), and lubricant contents under different extrusion conditions in a twin-screw extruder extrusion line. Optimal tensile and flexural properties were obtained with 50 wt% WF at 7 and 3 wt% lubricant and maleated polyethylene (MAPE) contents. The apparent shear viscosity of the WPC melts decreased gradually with increased lubricant content. Hence, for practical applications, a combination of HDPE grade, WF, lubricant, and MAPE contents can provide the benefits of lower shear viscosity while maintaining the mechanical properties and surface smoothness of WPC profiles.  (RDC 4/5/2011)

Wheat-Straw-HDPE Composite Produced by the Hot-pressing Method
(251-261)
Journal of Thermoplastic Composite Materials 24 #2 (2011)
Abstract

Wang et al of Northeast Forestry University, China, produced large size straw— polymer composite panels by hot-pressing method, focusing on the forms of raw materials and heating method.  Wheat straw was reduced to particles and high density polyethylene (HDPE) was processed into fibers or powders. After mixing, preheating, hot-pressing, and cooling, the resulted panels were tested for mechanical and water resistance properties. The data indicated that HDPE in the form of fiber presented better properties than those in powders and preheating treatment before hot-pressing was an effective way to improve the mechanical properties of the straw— PE composite. Coupling agent helped to improve the bonding strength.  (RDC 4/5/2011)

Cocrystallization of ethylene/1-octene copolymer blends during crystallization analysis fractionation and crystallization elution fractionation
(678–684)
Journal of Polymer Science B: Polymer Physics 49, #9 (2011)

Suriya, Anantawaraskul and Soares of Kasetsart University, Thailand and the University of Waterloo, Canada studied the effect of chain crystallizabilities, blend compositions, and cooling rates on cocrystallization using crystallization analysis fractionation (CRYSTAF) or crystallization elution fractionation (CEF). Cocrystallization is more prevalent when the copolymer blend has components with similar crystallizabilities.  (RDC 4/5/2011)

4/4/2011

Study on cell nucleation behavior of HDPE–wood composites/supercritical CO2 solution based on rheological properties
(3777-3784)  Journal of Materials Science 46 #11 (2011)

Zheng et al, China and Canada, measured the shear viscosities of wood–plastic composites (WPC)/supercritical CO2 (sc-CO2) solutions at different die temperatures and sc-CO2 contents  by a slit die attached on a single-screw extrusion system.  A theoretical model based on the Carreau-Yasuda model and Arrhenius equation was then developed to describe the shear-thinning behavior of the WPC/sc-CO2 solution. This model was incorporated into a finite element method software, POLYFLOW, to simulate the pressure and velocity field of WPC/sc-CO2 solution flowing through a foaming die. Based on the simulation results, the pressure drop rate and the location of the supersaturation point were estimated to investigate the cell nucleation.  (RDC 4/4/2011)

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March 2011 Polyethylene Articles  

3/31/2011

MODIFICATION OF RADIATION-CROSSLINKED COMPOSITES BASED ON HIGH-DENSITY POLYETHYLENE AND TERNARY ETHYLENE-PROPYLENE RUBBER WITH AP-U ALKYLRESORCINOL RESIN
(T/15-T/18)
International Polymer Science and Technology 37, #12 (2010)

Chagaev, Musin and Kimel'blat studied the modifying effect of alkyl resorcinol resin on filled radiation-crosslinked composites based on HDPE and ethylene-propylene rubbers.  The limits of action of the modifier and also the optimum radiation doses ensuring the most satisfactory combination of properties were determined. The properties studied included tensile properties, flow temperature, cold resistance and heat resistance. 4 refs. (Article translated from Plast.Massy, No.9, 2009, p.7-11)  (RDC 3/31/2011)

NANOCOMPOSITE MATERIALS BASED ON HIGH-DENSITY POLYETHYLENE WITH INCREASED THERMOMECHANICAL AND PHYSICOMECHANICAL PROPERTIES
(T/19-T/22)
International Polymer Science and Technology 37, #12 (2010)

Turaev et al studied the quantity and nature of organomodifiers on the thermomechanical and physicomechanical properties of HDPE nanocomposites.  The formation of crystalline structures when organoclay was introduced was shown.  High values of mechanical strength and heat resistance depended on each organomodifier of the clays.  The new nanocomposites obtained, by virtue of their good thermomechanical and physicomechanical characteristics, made it possible to reduce the thickness of articles while retaining their strength, which led to a saving of material and to an improvement in quality and appearance, and also broadened the service temperature range of the articles. 6 refs. (Article translated from Plast.Massy, No.9, 2009, p.11-14)  (RDC 3/31/2011)

STUDY OF THE STRUCTURAL ORGANISATION OF ABRASIVE COMPOSITES BASED ON ULTRAHIGH-MOLECULAR-WEIGHT POLYETHYLENE AND NATURAL DIAMOND POWDERS
(T/45-T/48)
International Polymer Science and Technology 37, #12 (2010)

Shits et al studied UHMWPE/diamond abrasive.  It was shown that an increase in the degree of crystallinity and a reduction in the size of the supermolecular formations of the polymer binder led to an improvement in the physicomechanical and service characteristics of the material. 4 refs. (Article translated from Plast.Massy, No.9, 2009, p.30-33)  (RDC 3/31/2011)

EFFECT OF CHLORINATED WATER ON PEROXIDE-CROSSLINKED POLYETHYLENE PEX-A
(T/59-T/65)
International Polymer Science and Technology 37, #12 (2010)
Gorbunova et al studied the effect of hot chlorinated water on peroxide-crosslinked polyethylene PEX-a.  It was shown that, even in the harshest conditions of treatment with disinfectant (the concentration of sodium hypochlorite was increased 10-20-fold by comparison with the accepted standards for potable water supply), direct chlorination (interaction of PE with chlorine) of PEX-a pipes did not occur. The pipes should thus retain their durability for their entire standard service life. 28 refs. (Article translated from Plast.Massy, No.9, 2009, p.40-46)  (RDC 3/31/2011)

3/26/2011

Natural mineral fire retardant fillers for polyethylene
(183–192)
Fire and Materials 35 #3 (2011)

Bellayer et al of the Ecole Nationale Supérieure de Chimie de Lille, France, studied the behaviour of common and low cost mineral fillers into a polyethylene matrix when exposed to mass loss calorimeter conditions.  The different systems are made of linear low-density polyethylene (LLDPE), with 50 wt% of calcium carbonate (CaCO3), magnesium carbonate or talc treated with stearic acid or nontreated. These systems were exposed to an external heat flux of 50kW/m 2 and their burning behaviours were compared. Significant decrease of heat release rate peaks (PkHRR) was obtained with all these mineral fillers; however, even better results were obtained when particles were treated with stearic acid. Indeed, the system with CaCO3-treated stearic acid leads to a surprising intumescent behaviour. A rheological study showed no impact of stearic acid on the viscosity of the system and did not explain the appearance of the intumescent phenomenon. However, scanning electron microscopy (SEM) shows that stearic acid enhances the dispersion of particles into the polymer and acts as a dispersive agent. The results also show that the aspect ratio of the particles, the cation nature of the carbonates and the polarity of the polymer matrix have an effect on the appearance or not on the intumescent phenomenon.   (RDC 3/26/2011)

023[2011]  Flow induced crystallization of LDPE nanocomposites: A rheological and morphological characterization
e-Polymers (3/26/2011) (26)
[Abstract]

Azzuri et al of the Institute for Macromolecular Studies - C.N.R, Italy show that under mild shear flow fields the organoclay exhibits a negligible nucleating effect. Both nucleation density and, as a consequence, crystallization rate, are not appreciably affected by the application of external flow field for both the examined systems, revealing that no evident synergic effects between the organoclay and the shear flow are present. On the other hand, Rheo SALS analysis indicates that the nanocomposite submitted to flow exhibits a higher level of crystal orientation. TEM morphological analyses support this observation suggesting that the orientation of the nanofiller along the flow direction templates the growth of oriented crystals.  (RDC 3/26/2011)

3/25/2011

Effect of chlorinated water on the oxidative resistance and the mechanical strength of polyethylene pipes  
(
277-285) Polymer Testing 30 #3 (2011)

Castagnetti, Mammano and Dragoni of the University. of Modena and Reggio Emilia, Italy, determined the effect of disinfectants was determined on the mechanical and chemical resistance of high-density polyethylene pipes, commonly used in modern urban networks for water conveyance.  A fully monitored test plant was built that was able to simultaneously expose both pipe sections and pre-cut dumbbell specimens to chlorinated and non-chlorinated water.  PE100 polyethylene pipes for alimentary use with a nominal diameter DN 32 were tested in two sets of experiments involving both chlorine dioxide (at a constant concentration of 5 ppm), and sodium hypochlorite (at a constant concentration of 2.5 ppm).  The effects of these disinfectants were assessed using monotonic tensile tests on dumbbell specimens and oxidation induction time tests. Pressure tests at a constant temperature were also performed to assess any damage in the pipe samples after one year of exposure to chlorine dioxide. The results from the tensile and oxidation induction time tests showed that chlorine dioxide was the most aggressive disinfectant. Nevertheless, the pressure tests at a constant temperature did not show any failure of the pipes after 2000 h of exposure.  (RDC 3/25/2011)

A viscoelastic model for a biomedical ultra-high molecular weight polyethylene using the time–temperature superposition principle  
(
294-302) Polymer Testing 30 #3 (2011)

Guede of the Universidade do Porto, Portugal, developed a mathematical model of the viscoelastic functions of a medical grade ultra high molecular weight polyethylene (UHMWPE).  It was verified that both horizontal and vertical shifts were necessary to superimpose the dynamic modulus/frequency curves. A new methodology was used to determine the horizontal and vertical shift factors for the time–temperature superposition. The present approach is based on a viscoelastic model, a fractional Maxwell model which, associated with the proposed methodology, leads to an easy and effective way to calculate these shift factors. The main advantage relies in the fact that the factors are obtained via a viscoelastic model, not empirically, which provides physical significance to both shift factors.  (RDC 3/25/2011)

Polyethylene waxes by metallocenes
(458–462)
Polymers for Advanced Technologies 22 #4 (2011)

Napoli et al of the Università degli Studi di Salerno, Italy, compared the syntheses of low-molecular-weight polyethylene (PE), in the presence of catalysts based on five different metallocene frameworks.  High yields and low molecular masses, typical of industrially relevant PE waxes, can be easily achieved by using overpressure of hydrogen.  Particularly suitable for the production of PE waxes are catalytic systems based on the C2 symmetric rac-dimethyl-silyl-bis-(2-methyl-4-phenyl-1-indenyl)-zirconium dichloride (1) and the C2v symmetric bis-cyclopentadienyl-zirconium dichloride (5). The wax yields can be substantially increased by increasing the MAO/Zr molar ratio. The control of the PE molecular weight allows an easy control of physical properties. In fact, as Mn increases in the range 103–104 g/mol, the degree of crystallinity decreases from nearly 85 to 60% while the melting temperature increases from 125°C up to 135°C.  (RDC 3/25/2011)

3/24/2011

Ultradrawing properties of ultra-high molecular weight polyethylene/functionalized carbon nanotube fibers
(687–696)
Polymer  Engineering &  Science 51 #4 (2011)

Yeh et al, Taiwan and China, studied the effect of the plain and functionalized carbon nanotube (CNT) contents on the ultradrawing properties of ultrahigh molecular weight polyethylene.  In a way similar to those found for the orientation factor values, the achievable draw ratios (Dra) of the FCy and FCfx-y as-prepared fibers approached a maximum value as their CNT and/or functionalized CNT contents reached their corresponding optimum values. The maximum achievable draw ratios of samples with varying maleic anhydride grafted polyethylene (PE-g-MAH)/modified CNTs weight ratios were significantly higher that of the FC0.0015 as-prepared fiber specimen prepared at the optimum plain CNT content.  Tensile property analysis further suggested that excellent orientation and tensile properties of the drawn FCy and FCfx-y fibers can be obtained by ultradrawing the fibers prepared at their optimum plain CNT and/or functionalized CNT contents.  (RDC 3/24/2011)

Influence of short glass fiber reinforcement on the morphology development and mechanical properties of PET/HDPE blends
(586–595)
Polymer Composites 32 #4 (2011)

Ronkay of the Budapest University of Technology and Economics, Hungary, prepared poly(ethylene-terephthalate) (PET)—high density polyethylene (HDPE) blends with varying component ratios and with or without short glass fiber reinforcement (10 gv%).  . In blends that do not contain glass fibers, the co-continuous structure formed in the vicinity of phase inversion increased both the static tensile modulus as well as the impact strength compared to the mechanical properties of polymers.  (RDC 3/24/2011)

Thermal properties and degradation characteristics of polylactide, linear low density polyethylene, and their blends
(939-953)
Polymer Bulletin 66 #7 (2011)

Singh et al, India, melt blended linear low density polyethylene (LLDPE) and polylactide (PLLA) in an extrusion mixer with post extrusion blown film attachment with and without compatibilizer-grafted low density polyethylene maleic anhydride.  The blend compositions were optimized for tensile properties as per ASTM D 882-91. Based on this, LLDPE 80 (80 wt% LLDPE & 20 wt% PLLA) and M-g-L 80/4 (80 wt% LLDPE, 20 wt% PLLA and 4 parts compatibilizer per hundred parts of resin) were found to be an optimum composition.  Compatibilizer enhances the dispersions of PLLA in LLDPE matrix.  The degradation study under different pH of soil compost gives that in alkaline condition and the presence of compatibilizer was favorable for degradation. This blend may be used for packaging application.  (RDC 3/24/2011)

Luminescent polyethylene with side-chain triarylboranes: Synthesis and fluoride sensing properties  
(
1510-1514) Polymer 52 #7 (2011)

Park et al KAIST and the University of Ulsan, South Korea, copolymerized ethylene with an electron-deficient borane monomer (1) using a single-site catalytic system, Me2Si(η5-C5Me4)(η1-N-tBu)TiCl2 (CGC)/methylaluminoxane (MAO) leading  to the novel class of luminescent polyethylene with pendent triarylborane groups.  The catalytic system provides high-molecular-weight copolymers with controlled incorporation of 1.  Particularly, the thin film of the copolymer exhibits the high fluorescence quenching response in the presence of a very low concentration of fluoride ion (4.5 μM) in THF. (RDC 3/24/2011)

3/23/2011

Influence of MWNT on Polypropylene and Polyethylene Photooxidation
(16–22)
Macromolecular Symposia 301 #1 (2011)

Synthesis of Additives from Montmorillonite to Modify High Density Polyethylene Final Properties
(104–113)
Macromolecular Symposia 301 #1 (2011)

Mechanical and tribological behaviors of UHMWPE composites filled with basalt fibers
(347-355)
Journal of Reinforced Plastics and Composites 30 #4 (2011)
Abstract

Cao et al of the China University of Mining and Technology, China, reinforced UHMWPE materials with basalt fibers because of their outstanding mechanical and tribological performances.  The UHMWPE composites with the filler content of 5—20 wt.% were prepared.  The results indicated that the UHMWPE composites’ impact toughness was decreased when filled with the basalt fibers, but the strength, hardness, and anti-indentation creep of the UHMWPE composites were improved. Under the same experimental conditions, the friction coefficient of the UHMWPE composites filled with basalt fibers was decreased to some extent, and the wear loss of the composites was significantly reduced. The analysis showed that the wear type of the UHMWPE composites was changed when filled with the basalt fibers. So, the wear-resistant performance of the UHMWPE composites was effectively enhanced.  (RDC 3/23/2011)

Properties of recycled polyethylene/ chitosan composites: the effect of polyethylene-graft-maleic anhydride
(195-202)
Journal of Reinforced Plastics and Composites 30 #3 (2011)
Abstract

Synthesis and characterization of materials prepared via the copolymerization of ethylene with 1-octadecene and norbornene using a [(π-cyano-nacnac)Cp] zirconium complex
(1535–1542)
Journal of Polymer Science Part A: Polymer  Chemistry 49 #7 (2011)

Conversion of poly(ethylene-alt-tetrafluoroethylene) copolymers into polytetrafluoroethylene by direct fluorination: A convenient approach to access new properties at the ETFE surface
(1517–1527)
Journal of Polymer Science Part A: Polymer  Chemistry 49 #7 (2011)

3/22/2011

Study on crystallization kinetics of LDPE filled with CaCO3 of different size and size distribution
(3490–3500)
Journal of Applied Polymer  Science 120 #6 (2011)

Application of different methods for the thermogravimetric analysis of polyethylene samples
(3511–3518)
Journal of Applied Polymer  Science 120 #6 (2011)

Novel diphenyl thioether-bridged binuclear metallocenes of Ti and Zr for synthesis of polyethylene with broad molecular weight distribution
(3530–3535)
Journal of Applied Polymer  Science 120 #6 (2011)

Effect of pro-oxidants on biodegradation of polyethylene (LDPE) by indigenous fungal isolate, Aspergillus oryzae
(3536–3545)
Journal of Applied Polymer  Science 120 #6 (2011)

Preparation and characterization of low density polyethylene/ethylene methyl acrylate glycidyl methacrylate/organoclay nanocomposites
(3087–3097)
Journal of Applied Polymer  Science 120 #5 (2011)

Novel dynamic vulcanization of polyethylene and ozonolysed natural rubber blends: Effect of curing system and blending ratio
(2606–2614)
Journal of Applied Polymer  Science 120 #5 (2011)

Theoretical and experimental study of the melting process of high-density polyethylene for multidimensional vibration equipment
(2912–2920)
Journal of Applied Polymer  Science 120 #5 (2011)

3/21/2011

Influence of different sterilization procedures on the morphological parameters and mechanical properties of ultra-high-molecular-weight polyethylene
(1875–1884)
 
Journal of Applied Polymer  Science 120 #4 (2011)

Crystallization and the mechanical and rheological properties of decrosslinked–crosslinked-high-density polyethylenes using a supercritical fluid
(2090–2094)
 
Journal of Applied Polymer  Science 120 #4 (2011)

The effects of different silane crosslinking approaches on composites of polyethylene blends and wood flour
(2292–2303)
 
Journal of Applied Polymer  Science 120 #4 (2011)

3/10/2011

A three-phase microstructural model to explain the mechanical relaxations of branched polyethylene: a DSC, WAXD and DMTA combined study
(257-268)
Colloid and Polymer Science 289 #3 (2011)

3/9/2011

Prediction of the molecular and polymer solution properties of LDPE in a high-pressure tubular reactor using a novel Monte Carlo approach 
( 1685-1696) Chemical Engineering Science 66  #8 (2011)

3/8/2011

Effects of PBO fiber and clay on the mechanical, morphological, and dynamic mechanical properties of NR/HDPE blends
(419–425)
Polymer  Engineering &  Science 51 #3 (2011)

Preparation and properties of melt-mixed metallocene polyethylene/silica nanocomposites
(434–444)
Polymer  Engineering &  Science 51 #3 (2011)

Identification of transient responses of a plasticating twin screw extruder due to excitation in feed rate
(482–491)
Polymer  Engineering &  Science 51 #3 (2011)

Iqbal, Sundararaj and Shah of the University of Alberta, Canada, studied a  corotating plasticating twin screw extruder (TSE) by changing feed rate according to predesigned random binary sequence  and stair type excitation using a high density polyethylene.  Empirical models were developed relating two output variables, melt pressure at die (Pm), and melt temperature at die (Tm), with feed rate (F).  Classical linear system identification technique was used to develop models. Models were developed using a data set obtained from RBS excitation. Stair type excitation data were used to validate the developed models. The structure of the obtained models was autoregressive moving average with exogenous input (ARMAX). Models with ARMAX structure and order of 2 were found to be sufficient to capture the dynamic behaviors of Pm and Tm when F was changed. A delay-gain model was proposed for Pm and was found to capture the response quite satisfactorily.  (RDC 3/8/2011)

Visualization of initial expansion behavior of butane-blown low-density polyethylene foam at extrusion die exit
(492–499)
Polymer  Engineering &  Science 51 #3 (2011)

Wnag, Lee and Park of the Industrial Engineering University of Toronto, Canada, used a charge-coupled device (CCD) camera to observe n-butane-blown low-density polyethylene (LDPE) foams at the extrusion die exit. The effects of butane content, nucleating-agent (talc) content, aging modifier (glycerol monostearate), die temperature, and die geometry on the initial expansion behavior of the foam extrudate were studied. A transparent section of the foam extrudate was found at certain die temperatures. (RDC 3/8/2011)

3/11/2011

Influence of carbon black properties on the Joule heating stimulated shape-memory behavior of filled ethylene-1-octene copolymer
(500–508)
Polymer  Engineering &  Science 51 #3 (2011)

Le et al of Martin Luther University, Germany, studied the shape-memory (SM) behavior of ethylene-1-octene copolymer (EOC) reinforced by carbon black (CB) was investigated. Two CB types, N110 and EC600, with different structure and specific surface area were used as conductive fillers. The mechanical tests showed that on addition of CB into EOC, modulus and strength increased significantly for both CB types.  The electrical resistivity decreases drastically with increasing CB content. The thermally stimulated shape memory recovery is deteriorated significantly because of the rigid CB network formed in EOC.  With increasing temperature, the CB network gradually loses its rigidity, as the glassy polymer layers connecting the CB aggregates become softened. As a result, the samples with high CB content could recover nearly 100%. EOC containing 17 wt% CB EC600 reaches a low resistivity of 8 Ω cm and shows good Joule heating stimulated SM recovery of up to 97% at a voltage of 15 V. (RDC 3/8/2011)

Off-line and in-line analysis of phase morphology and evolution during solidification process of PP/PEOc blend in an internal mixer
(609–616)
Polymer  Engineering &  Science 51 #3 (2011)

Zhu, Song and Xu of Tianjin University and Jiangsu University, China studied phase morphology and evolution during solidification process of polypropylene and poly(ethylene-co-octene) (PP/PEOc) blend in an internal mixer by scanning electron microscopy (SEM) and in-line back small-angle laser scattering (BSALS). The average particle diameter (dp) and the average characteristic length (Lm) were calculated by the pattern analysis of SEM micrographs to describe morphological variation with temperature during solidification process under the natural cooling condition. Furthermore, a fractal dimension (Df) based on the probability density of the character length was calculated in this study to describe the distribution of main sizes of the dispersed phase particles. Structure parameters, such as heterogeneity distance (lc) and integral invariant (Q), were also calculated using BSALS to describe solidification process.  (RDC 3/8/2011)

Mathematical modeling of the graft reaction between polystyrene and polyethylene  
(
416-425)
Polymer Degradation and Stability 96 #4 (2011)

Post-irradiation oxidation of different polyethylenes  
(
624-629)
Polymer Degradation and Stability 96 #4 (2011)

Preparation of ultra high molecular weight polyethylene with MgCl2/TiCl4 catalyst: effect of internal and external donor on molecular weight and molecular weight distribution
(627-635)
Polymer Bulletin 66 #5 (2011)

Zhang et al, South Korea prepared ultra high molecular weight polyethylene (UHMWPE) was prepared by using MgCl2-supported TiCl4 catalyst in conjunction with triethylaluminium (TEA) cocatalyst.  The catalyst activity with various kinds of internal donor decreased in the following order: none > succinate > phthalate > diether, while the catalyst activity was less influenced by the structure of external donor. The highest molecular weight and polydispersity index of UHMWPE were obtained by the catalyst of succinate as internal donor. It was also observed that the molecular weight and PDI of UHMWPE were less affected by the introduction of external donor. (RDC 3/7/2011)

Synthesis of LLDPE/TiO2 nanocomposites by in situ polymerization with zirconocene/dMMAO catalyst: effect of [Al]/[Zr] ratios and TiO2 phases
(479-490)
Polymer Bulletin 66 #4 (2011)

3/7/2011

Wear resistant UHMWPE with high toughness by high temperature melting and subsequent radiation cross-linking  
(
1155-1162) Polymer 52 #4 (2011)
Fu et al of Massachusetts General Hospital and the Harvard Medical School, Massachusetts developed wear resistant ultra high molecular weight polyethylene (UHMWPE) with improved strength and toughness.  High temperature melting (HTM) of UHMWPE at 280–320 °C improved its toughness without reducing wear resistance. Crosslinking by radiation after melting generated UHMWPE with improved toughness compared to the crosslinking before melting, partly due to the low cross-link density of irradiated HTM UHMWPE.  Therefore, successive HTM and radiation cross-linking strategy is promising to create UHMWPE materials with low wear and improved mechanical properties for total joint implants.  (RDC 3/4/2011)

Rice hull biocomposites, part 2: Effect of the resin composition on the properties of the composite
(2050–2059)
Journal of Applied Polymer  Science 121 #4 (2011)

Quirino and Larock of Iowa State University, Iowa, reinforced a free radical thermoset resin consisting of a copolymer of conjugated linseed oil (CLO) or conjugated soybean oil (CSO), n-butyl methacrylate (BMA), divinylbenzene (DVB), and maleic anhydride (MA) with rice hulls.  Composites containing 70 wt % of the filler were compression molded, the conjugated oil content in the resin was kept constant at 50 wt %, and the relative amounts of BMA, DVB, and MA were varied to afford composites with different resin compositions.  Overall, the mechanical properties tend to improve when MA is introduced into the resin. Scanning electron microscopy of selected samples showed a better filler–resin interaction for MA-containing composites and samples prepared from CLO exhibit better properties than those prepared from CSO.  (RDC 5/23/2011)

 

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