Microstructure and crystallization of isotropic films made of vinylidene fluoride-tetrafluoro-ethylene copolymer☆

Abstract It has been demonstrated by X-ray diffraction, spectroscopic and acoustic methods that vinylidene fluoride-tetrafluoroethylene copolymer (94: 6 by mole) contains a ferroelectric phase, which coexists at room temperature with intrusions of a paraelectric phase formed by chain segments in the conformations tgtg − and t 3 gt 3 g − . Defects of the type head-to-head and the conductivity of the crystallizing system are shown to play an important role in the formation of the ferroelectric phase.