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Piezoelectric Materials

Patent Abstracts

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

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Patents with Abstracts

8,241,653 
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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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
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Copyright 2012 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 8/17/2012.