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Title: Detrapping behavior of trapped space charges in ferroelectric copolymers of vinylidene fluoride with trifluoroethylene
Authors: Zhang, X
Peng, Z
Chan, HLW 
Choy, CL
Keywords: Cooling
Electric space charge
Electric variables measurement
Electromagnetic wave polarization
Electron traps
Ferroelectric materials
Phase transitions
Plastics casting
Issue Date: 1999
Publisher: IEEE
Source: ISE 10 : 10th International Symposium on Electrets : 22-24 September 1999, European Cultural Centre of Delphi, Greece : proceedings, p. 581-584 How to cite?
Abstract: Three kinds of slowly-cooled ferroelectric VDF/TrFE copolymer samples with different VDF contents (56, 70, 77 mole %) were prepared by casting from methyl ethyl ketone solution and followed by cooling slowly from melting state to room temperature. The thermally stimulated depolarization current (TSDC) of the copolymer has been measured at various polarization temperatures (60-130°C). In the TSDC spectra, three peaks of detrapping charges for VDF(70)/TrFE(30) and VDF(77)/TrFE(23), two peaks for VDF(56)/TrFE(44) are observed. According to the peaks appeared at different cooling temperature during polarization and the analysis of phase transition, the structural origin of the TSDC peaks is proposed. The detrapping density of trapped charges shows that the ability of charge storage for VDF(70)/TrFE(30) is higher than that for other two copolymers.
ISBN: 0-7803-5025-1
Rights: © 1999 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.
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