Dielectric measurements and X-ray investigations on the phase transitions of poly (vinylidene fluoride-hexafluoropropylene) copolymers

Author

Latour, Mireille

Author_Institution

Lab. de Physique Moleculaire et Cristalline, Univ. des Sci. et Techniques du Langeudoc, Montpellier, France

fYear

1991

fDate

25-27 Sep 1991

Firstpage

489

Lastpage

494

Abstract

Paraelectric-to-ferroelectric phase transition has been observed under low electrical stresses in vinylidenefluoride-hexafluoropropylene (VDF-HFP) copolymers with 15% HFP molar content. This phase transition, detected by thermodepolarization processes and differential scanning calorimetry techniques, is confirmed in the present work by X-ray and dielectric measurements. These results showed the structural evolution of the copolymer from the α nonpolar to the δ polar configuration under electrical stress of 0.5 MV/cm

Keywords

X-ray diffraction examination of materials; dielectric polarisation; electrets; ferroelectric materials; ferroelectric transitions; polymer blends; polymer structure; PVDF-HFP; X-ray; dielectric measurements; differential scanning calorimetry; electret; low electrical stresses; paraelectric to ferroelectric transition; phase transitions; poly (vinylidene fluoride-hexafluoropropylene) copolymers; structural evolution; thermodepolarization processes; Calorimetry; Crystallization; Dielectric measurements; Diffraction; Ferroelectric materials; Phase detection; Piezoelectric polarization; Resins; Temperature; Thermal stresses;

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.1991.167261

Filename

167261