Internal charge generation in polyvinylidene fluoride films during poling observed by Raman spectroscopy

Author

Eisenmenger, W. ; Schmidt, H.

Author_Institution

1. Phys. Inst., Stuttgart Univ., Germany

fYear

1998

fDate

27-30 Sep 1998

Firstpage

399

Lastpage

401

Abstract

The electrical degradation and charge generation in PVDF during poling has been investigated using Raman spectroscopy. Two new peaks at 1118 cm^-1 and 1515 cm^-1 corresponding to conjugated polyene sequences arise in the Raman spectrum after poling. In conjunction with our observation that HF gas is formed during poling at the negative electrode, a HF-unzipping chain reaction initiated by F ^--ions is proposed. The large amount of HF which can be generated by this mechanism might be a source for additional ionic charges if the HF molecules dissociate into H⁺- and F^--ions. Thus these additional charges could lead to a complete internal polarization neutralization even if the amount of injected charges is too small for this

Keywords

Raman spectra; dielectric polarisation; polymer films; polymers; HF-unzipping chain reaction; Raman spectroscopy; conjugated polyene sequences; electrical degradation; internal charge generation; internal polarization neutralization; poling; polyvinylidene fluoride films; Degradation; Electrodes; Hafnium; Infrared spectra; Optical polarization; Phase detection; Polymer films; Raman scattering; Signal generators; Spectroscopy;

fLanguage

English

Publisher

ieee

Conference_Titel

Electrical Insulating Materials, 1998. Proceedings of 1998 International Symposium on

Conference_Location

Toyohashi

Print_ISBN

4-88686-050-8

Type

conf

DOI

10.1109/ISEIM.1998.741767

Filename

741767