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The ferroelectric properties of vinylidene fluoride-trifluoroethylene copolymer were studied. The infrared absorption spectra and x-ray diffraction patterns of the melt-crystallized film suggested the similar crystalline form to the polar form I of polyvinylidene fluoride. It was found that the ferroelectric-to-paraelectric phase transition occurred at 70 °C and was the first order in the melt-crystallized copolymer film by studying the dielectric constant, piezoelectric constant, D-E hysteresis loop, and DSC measurement. The Curie constant was 2200 K. The phase transition was accompanied by the expansion of the crystal lattice.
Yamada et al. (Sun,) studied this question.