The effect of uniaxial orientation on the dielectric relaxation behavior of alpha-PVDF

ÖZKAZANÇ E., GÜNEY H. Y., OSKAY T., TARCAN E.

JOURNAL OF APPLIED POLYMER SCIENCE, vol.109, no.6, pp.3878-3886, 2008 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 109 Issue: 6
  • Publication Date: 2008
  • Doi Number: 10.1002/app.28617
  • Journal Name: JOURNAL OF APPLIED POLYMER SCIENCE
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.3878-3886
  • Kocaeli University Affiliated: Yes

Abstract

alpha-crystalline phase poly(vinylidene fluoride) (PVDF) film was oriented uniaxially at different draw ratios. Morphological effects of orientation were investigated by X-ray diffraction and differential scanning calorimetry (DSC) measurements on the oriented samples. The dielectric loss factor was measured from 100 Hz to 1 MHz range between 80 and 400 K as a function of frequency and temperature. While the activation energy of the alpha-relaxation transition was not affected by the orientation, it was observed that there is a linear increase in the activation energy of the beta-relaxation transition with draw ratio. The relaxation time of the beta-relaxation transition was more affected by the orientation process at lower temperatures. (C) 2008 Wiley Periodicals, Inc.