DocumentCode :
3228335
Title :
Advances in relaxor ferroelectric terpolymer: New applications
Author :
Bauer, François ; Capsal, Jean Fabien ; Larcher, Quentin ; Santos, F. Domingues Dos
Author_Institution :
Piezotech SAS, Hésingue, France
fYear :
2011
fDate :
24-27 July 2011
Firstpage :
1
Lastpage :
4
Abstract :
It has been found that by introducing defects into the P(VDF-TrFE) copolymers, it is possible to convert the polymer from a normal ferroelectric to a relaxor ferroelectric. A new class of ferroelectric polymers, i.e., the terpolymers of P(VDF-TrFE-CFE) or of P(VDF-TrFE-CTFE), was developed from the normal ferroelectric PVDF-TrFE polymer by employing proper defect modifications which eliminate detrimental effects associated with a normal first order F-P transition while maintaining high material responses. Relevant studies show that this class of electroactive polymers offers unique properties in comparison with other ferroelectric polymers. The syntheses of these relaxor ferroelectric polymers have been done by a combination of the suspension polymerization process and an oxygen-activated initiator at Piezotech SAS (Patent application). Films from cast solution can be made in different length and thicknesses. Stretching of these films increases the performance as well as the mechanical properties. These relaxor-ferroelectric terpolymers P(VDF-TrFE-CFE), P(VDF-TrFE-CTFE) are multifunctional i.e. electrostrictive material (actuators), dielectric for electric energy storage. The terpolymer exhibits high electrostrictive strain (>;7%) with relatively high modulus (>;0.4GPa) and high permittivity value (ε~60). Examples of device applications (unimorphs, multifocal lens...) are presented and described.
Keywords :
casting; electroactive polymer actuators; ferroelectric thin films; ferroelectric transitions; lenses; mechanical energy storage; permittivity; polymer blends; polymer films; polymerisation; relaxor ferroelectrics; suspensions; thin film devices; actuators; cast solution films; copolymers; defects; dielectric energy storage; electric energy storage; electroactive polymers; electrostrictive strain; first order ferroelectric-paraelectric transition; mechanical properties; multifocal lens; multifunctional electrostrictive material; oxygen-activated initiator; permittivity; relaxor ferroelectric terpolymer; suspension polymerization; unimorphs; Acceleration; Annealing; Atmosphere; Frequency measurement; Lenses; Materials; Actuators; Optical device; P(VDF- TrFE-CTFE); P(VDF-TrFE-CFE); Relaxor-ferroelectric terpolymer; Terpolymer Relaxor properties;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Applications of Ferroelectrics (ISAF/PFM), 2011 International Symposium on and 2011 International Symposium on Piezoresponse Force Microscopy and Nanoscale Phenomena in Polar Materials
Conference_Location :
Vancouver, BC
Print_ISBN :
978-1-4577-1162-6
Electronic_ISBN :
978-1-4577-1161-9
Type :
conf
DOI :
10.1109/ISAF.2011.6014109
Filename :
6014109
Link To Document :
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