Anomalous discharge process in copolymers of vinylidene fluoride

Author

Murata, Yukinobu ; Koizumi, Naokazu

Author_Institution

Osaka Prefectural Tech. Coll., Neyagawa, Japan

fYear

1991

fDate

25-27 Sep 1991

Firstpage

129

Lastpage

134

Abstract

Anomalous discharge behavior involving the occurrence of a current peak in the isothermal discharge process has been observed for vinylidene fluoride-trifluoroethylene (VDF/TFE) copolymers in the paraelectric phase. The current peak was found for VDF/TFE copolymer with high TFE content in the paraelectric and also for VDF/HFP (hexafluoropropylene) copolymer with 2 mol.% HFP taking structure of the form 11 PVDF (polyvinylidene fluoride). The anomalous behavior is connected with retarded migration or diffusion of ionic charge bound with molecular dipoles in crystalline regions. The VDF group or the VDF sequence in the copolymer possibly plays an important role in trapping or restraining ions

Keywords

dielectric properties of solids; electrets; electric breakdown of solids; ionic conduction in solids; polymer blends; TFE; VDF; copolymers; crystalline regions; electrets; ion trapping; ionic charge diffusion; isothermal discharge process; molecular dipoles; paraelectric phase; retarded migration; vinylidene fluoride-trifluoroethylene; Conductivity; Crystallization; Current measurement; Dielectric measurements; Dielectrics and electrical insulation; Ferroelectric materials; Isothermal processes; Plastic insulation; Polymers; Temperature dependence;

fLanguage

English

Publisher

ieee

Conference_Titel

Electrets, 1991. (ISE 7) Proceedings., 7th International Symposium on (Cat. No.91CH3029-6)

Conference_Location

Berlin

Print_ISBN

0-7803-0112-9

Type

conf

DOI

10.1109/ISE.1991.167195

Filename

167195