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Phase diagram of poly(VDF-ter-TrFE-ter-CTFE) copolymers: Relationship between crystalline structure and material properties
HADZIIOANNOU, Georges
Laboratoire de Chimie des Polymères Organiques [LCPO]
Team 4 LCPO : Polymer Materials for Electronic, Energy, Information and Communication Technologies
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Laboratoire de Chimie des Polymères Organiques [LCPO]
Team 4 LCPO : Polymer Materials for Electronic, Energy, Information and Communication Technologies
HADZIIOANNOU, Georges
Laboratoire de Chimie des Polymères Organiques [LCPO]
Team 4 LCPO : Polymer Materials for Electronic, Energy, Information and Communication Technologies
Laboratoire de Chimie des Polymères Organiques [LCPO]
Team 4 LCPO : Polymer Materials for Electronic, Energy, Information and Communication Technologies
TENCÉ-GIRAULT, Sylvie
Laboratoire Procédés et Ingénierie en Mécanique et Matériaux [PIMM]
Arkema [Arkema]
< Reduce
Laboratoire Procédés et Ingénierie en Mécanique et Matériaux [PIMM]
Arkema [Arkema]
Language
EN
Article de revue
This item was published in
Polymer. 2020-11-01p. 123203
English Abstract
Depending on their CTFE content (from 0 to 10 mol %), poly(VDF-ter-TrFE-ter-CTFE), poly(vinylidene fluoride-ter-trifluoroethylene-ter-chlorotrifluoroethylene) copolymers, exhibit ferroelectric (FE) or relaxor ferroelectric ...Read more >
Depending on their CTFE content (from 0 to 10 mol %), poly(VDF-ter-TrFE-ter-CTFE), poly(vinylidene fluoride-ter-trifluoroethylene-ter-chlorotrifluoroethylene) copolymers, exhibit ferroelectric (FE) or relaxor ferroelectric (RFE) properties at room temperature. Solvent cast films of these terpolymers can crystallize in three orthorhombic phases: FE, DFE (Defective Ferroelectric) or RFE according to their amount of CTFE. The relative amount of each crystalline phase depends on the amount of CTFE and evolves after annealing. We study the dependence of the electric displacement−electric field (D−E) loop with the amount of CTFE and with annealing step. We observed a closely link between the remnant polarization, PR, and the fraction of (FE + DFE) crystalline phase. Macroscopic properties, studied using thermo-mechanical experiments (DSC and DMA) and dielectric spectroscopy, evolve continuously with the CTFE amount and are well correlated with the structural properties. Finally, a temperature versus mol% CTFE phase diagram is established and discussed in relation-ship with material properties.Read less <
English Keywords
VDF based terpolymer
Phase diagram
Crystal structure
Electroactive material
ANR Project
“Plate-forme de l’Université de Bordeaux pour l’organique électronique imprimable : de la molécule aux dispositifs et systèmes intégrés - valorisation et commercialisation” - ANR-10-EQPX-0028