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Structural evolution and dielectric relaxation behavior of electron-irradiated poly(vinylidene fluoride–trifluoroethylene) 80/20 mol % copolymers

Authors :
Xingzhong Zhao
Sien Ting Lau
Shishang Guo
Chung-loong Choy
Helen L. W. Chan
Source :
Journal of Applied Physics. 94:5566-5573
Publication Year :
2003
Publisher :
AIP Publishing, 2003.

Abstract

The effect of high-energy electron irradiation on poly(vinylidene fluoride-trifluoroethylene) 80/20 mol % copolymers has been studied in a broad dose ranging from 0 to 120 Mrad. It was found that the copolymers transformed from a normal ferroelectric to a relaxor ferroelectric phase (RFE) at high electron doses. For copolymers irradiated at the dose above 90 Mrad, they exhibited typical dielectric behavior of RFE, e.g., whose dielectric constant peaks show strong frequency dispersion. X-ray diffraction patterns showed that the irradiation induced a coexistence of the polar and nonpolar phase in the crystalline regions, leading to nanosized coherent regions in the irradiated copolymer films. Differential scanning calorimetery and polarization hysteresis loops also revealed the reduction in the crystallinity and stability of the ferroelectric state, reflecting significant changes in the ferroelectric-to-paraelectric phase transition due to the effect of high-energy electron irradiation.

Details

ISSN :
10897550 and 00218979
Volume :
94
Database :
OpenAIRE
Journal :
Journal of Applied Physics
Accession number :
edsair.doi...........5e7bf4195d2be828ead20ba3f6fbd250
Full Text :
https://doi.org/10.1063/1.1606853