Abstract

The structure of ferroelectric copolymers of vinylidene fluoride with hexafluoropropylene is investigated using wide-angle x-ray diffraction. It is shown that the crystallization of extruded films of vinylidene fluoride-hexafluoropropylene copolymers brings about the formation of the nonpolar α modification and, possibly, the polar αp modification. An increase in the hexafluoropropylene content in the copolymer leads to a decrease in the degree of perfection of the α (αp) phase, on the one hand, and a reduction of its volume fraction, on the other hand.

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