Maro Publications

Piezoelectric Materials

Patent Abstracts

From 09/18/2014 through 8/17/2012

Maro Encyclopedia




Patent Titles


Patents with Abstracts

Piezoelectricity modulated release rate of drug from a coating
Hossainy et al of Abbott Cardiovascular Systems Inc.  controlled the release rate of a bioactive agent from an implantable medical device by controlling the crystallinity of a piezoelectric  coating. The piezoelectric polymer is a copolymer comprising units derived from fluoro vinyl monomers. The piezoelectric polymer comprises poly(vinylidene fluoride) (PVDF) or poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP). The crystal lamella microstructure of PVDF-HFP and other fluorinated polymers form a class of polymers called ferroelectric polymers that can exhibit piezoelectric and pyroelectric activity, which is especially strong in an aligned crystal lamella. This activity is induced by the application of a strong electric field across the polymer, which causes a rotation of the polymer's molecular structure such that its fluorine atoms are all on one side of the molecule (transition from a non-polar alpha phase to a polar beta phase). This polarization is not retained by the amorphous lamella after the electric field is removed; however, it is retained by the crystal lamella. (RDC 8/17/2012)


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(RDC 6/5/2012)


Roger D. Corneliussen

Maro Polymer Links
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Copyright 2012 by Roger D. Corneliussen.
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** Date of latest addition; date of first entry is 8/17/2012.