Detrapping behavior of trapped space charges in ferroelectric copolymers of vinylidene fluoride with trifluoroethylene

Author

Zhang, Xingyuan ; Peng, Zhi ; Chan, Helen L.W. ; Choy, Chung-Loong

Author_Institution

Dept. of Polymer Sci. & Eng., Univ. of Sci. & Technol. of China, Hefei, China

fYear

1999

fDate

1999

Firstpage

581

Lastpage

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

Keywords

dielectric polarisation; dielectric relaxation; ferroelectric materials; glass transition; polymer blends; space charge; thermally stimulated currents; 60 to 130 C; detrapping behavior; ferroelectric copolymers; methyl ethyl ketone solution; thermally stimulated depolarization current; trapped space charges; vinylidene fluoride with trifluoroethylene; Cooling; Current measurement; Ferroelectric materials; Heating; Polarization; Polymers; Pyroelectricity; Space charge; Space technology; Temperature;

fLanguage

English

Publisher

ieee

Conference_Titel

Electrets, 1999. ISE 10. Proceedings. 10th International Symposium on

Conference_Location

Athens

Print_ISBN

0-7803-5025-1

Type

conf

DOI

10.1109/ISE.1999.832114

Filename

832114