Abstract
Abstract Ferroelectric properties have been studied for copolymers of vinylidene fluoride (VDF) and tetrafluoroethylene (TeFE) with different TeFE content of 17 to 30 mol%. The Curie transition in the copolymers was considerably influenced by annealing as well as poling in preparation of specimens. The polarization reversal and the ferroelectric hysteresis were observed using 10 mHz high voltage triangular wave. A large remanent polarization above 80 mCm−2 was exhibited by melt crystallized samples of copolymers with 20–25 mol% TeFE, while the coercive field scarcely depended on the comonomer content. Drawn films of the copolymer showed a rather small remanent polarization which contrasted strikingly with the case of the copolymer of trifluoroethylene. The pyroelectric coefficient was highest for 20–25 mol% TeFE copolymer, exhibiting a linear relationship with the remanent polarization. The coercive field and the remanent polarization were slightly increased by hydrostatic pressure in a pressure range of ...
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