Maro Publications

Nanostructures

Patent Abstracts

*8/2/2013  
from 8/1/2013

Maro Topics

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Patent Abstracts

2. Controlled Nanostructures

U.S. Patent 8,481,164 (July 9, 2013), “Materials having Predefined Morphologies and Methods of Formation thereof,” Jennifer Nam Cha, James Lupton Hedrick, Ho-Cheol Kim, Robert Dennis Miller, and Willi Volksen (International Business Machines Corporation, Armonk, New York, USA).

Materials with specific nanostructures could be useful but they are difficult to produce economically, precisely and in large quantities.  Cha et al controlled nanostructures using self-assembling block copolymers containing a crosslinkable polymer.  An example is polystyrene-block-poly(ethylene oxide) material containing a crosslinkable polymer, poly(methylsilsesquioxane), miscible with the oxide block.  Solutions of the material are spin casted to form a film.  The film is annealed with a solvent vapor at room temperature for 10 to 15 hours.  Specific morphologies were produced which including 1 to 500 nm  nanopores and nanolamellae.  The nanostructures are determined by copolymer composition and curing agent content.

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1. U.S. Patent 8,491,965 (July 23, 2013), “Method of Controlling Orientation of Domains in Block Copolymer films,” Joy Cheng, Ho-Cheol Kim, Daniel P. Sanders, and Linda Sundberg (International Business Machines Corporation, Armonk, New York, USA).

Block copolymers films can be used in which phase separation forms nanoscale structures by phase separating microdomains.  One problem is controlling the orientation of the assembled microdomains which tend to organize into randomly oriented nanostructures.  Cheng et al oriented microphase-separated domains with a control agent. This control agent typically coats the surface and controls microphase orientation by interaction with the solidifying block copolymer.  For example, a control agent for the poly(styrene-b-methyl methacrylate) diblock copolymer is a random copolymer of styrene and methylmethacrylate.   A melt of the two polymers are put in contact with a surface and cooled.  The random copolymer preferentially coats the surface and induced oriented phase separation in the block copolymer. 

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Interested!!
Bookmark this page to follow future developments!.
(RDC 6/5/2012)

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Roger D. Corneliussen
Editor
www.maropolymeronline.com

Maro Polymer Links
Tel: 610 363 9920
Fax: 610 363 9921
E-Mail: cornelrd@bee.net  

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Copyright 2013 by Roger D. Corneliussen.
No part of this transmission is to be duplicated in any manner or forwarded by electronic mail without the express written permission of Roger D. Corneliussen
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** Date of latest addition; date of first entry is 8/1/2013.