Title :
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
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;
Conference_Titel :
Electrical Insulating Materials, 1998. Proceedings of 1998 International Symposium on
Conference_Location :
Toyohashi
Print_ISBN :
4-88686-050-8
DOI :
10.1109/ISEIM.1998.741767
