Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/19759
Title: Thermally Stimulated Depolarization Current in Electron-Irradiated Poly(vinylidene fluoride-trifluoroethylene) (56/44 mol %) Copolymers
Authors: Guo, SS
Li, WP
Zhao, XZ
Peng, Z
Lau, ST
Chan, HLW 
Choy, CL 
Keywords: Dielectric relaxation
Differential scanning calorimetry (DSC)
Irradiation
Phase transition
Poly(vinylidene fluoride-trifluoroethylene) [P(VDF-TrFE)]
Structural changes
Thermally stimulated depolarization current (TSDC)
Issue Date: 2004
Publisher: John Wiley & Sons
Source: Journal of polymer science. Part B, Polymer physics, 2004, v. 42, no. 6, p. 1099-1105 How to cite?
Journal: Journal of polymer science. Part B, Polymer physics 
Abstract: The effect of electron irradiation on poly(vinylidene fluoride-trifluoroethylene) (56/44 mol %) copolymers was studied with dielectric constant measurements, differential scanning calorimetry (DSC), X-ray diffraction, thermally stimulated depolarization current (TSDC) spectroscopy, and polarization hysteresis loops. The dielectric relaxation peaks, obeying the Vogel-Fulcher law, indicated that the copolymers were transformed from a normal ferroelectric to a relaxor ferroelectric. The X-ray and DSC results showed that both the crystalline and polar ordering decreased after irradiation, indicating a partial recovery from trans-gauche bonds to local trans bonds (polar ordering). Moreover, the peak temperature decreased with the irradiation dose in the TSDC spectra; this demonstrated fewer dipoles and crystalline regions in the irradiated copolymer films during the ferroelectric-paraelectric transition and was consistent with polarization hysteresis loop measurements.
URI: http://hdl.handle.net/10397/19759
ISSN: 0887-6266
EISSN: 1099-0488
DOI: 10.1002/polb.10784
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