Title :
Paraelectric to ferroelectric phase transitions in VDF/HFP copolymers under low electric stress
Author :
Latour, M. ; Anis, K.
Author_Institution :
Lab. de Phys. Moleculaire et Cristalline, Univ. des Sci. et Tech. du Languedoc, Montpellier, France
fDate :
2/1/1993 12:00:00 AM
Abstract :
Paraelectric to ferroelectric phase transition is observed under low electrical fields 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 show the structural evolution of the copolymer from the a nonpolar to the δ polar configuration, under low electrical fields of 0.5 MV/cm
Keywords :
X-ray diffraction examination of materials; ferroelectric materials; ferroelectric transitions; permittivity; polymer blends; thermal analysis; thermally stimulated currents; DSC; TSC; VDF/HFP copolymers; X-ray diffraction spectra; dielectric measurements; differential scanning calorimetry techniques; electrical fields; low electric stress; paraelectric-ferroelectric phase transition; permittivity; structural evolution; thermodepolarization processes; vinylidenefluoride-hexafluoropropylene copolymers; Annealing; Dielectric measurements; Ferroelectric materials; Phase detection; Polarization; Reflection; Resins; Temperature; Thermal stresses; X-ray diffraction;
Journal_Title :
Electrical Insulation, IEEE Transactions on
