Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/576
Title: Detrapping behavior of trapped space charges in ferroelectric copolymers of vinylidene fluoride with trifluoroethylene
Authors: Zhang, Xingyuan
Peng, Zhi
Chan, Helen L. W.
Choy, Chung-loong
Subjects: Cooling
Electric space charge
Electric variables measurement
Electromagnetic wave polarization
Electron traps
Ferroelectric materials
Melting
Phase transitions
Plastics casting
Temperature
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.
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.
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Type: Conference Paper
URI: http://hdl.handle.net/10397/576
ISBN: 0780350251
Appears in Collections:MRC Conference Papers & Presentations
AP Conference Papers & Presentations

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