The pressure dependence of the melting and crystallization temperatures of poly(vinylidene fluoride) is determined by high-pressure differential thermal analysis (DTA). These results are used in the investigation of the polymorphic crystal form obtained by pressure quenching molten poly(vinylidene fluoride): The resulting crystal form depends on both the initial and final pressures. The pressure-quenching experiments were performed in a high-pressure piston-cylinder system and in a high-pressure DTA system; a comparison is made of the results obtained by both methods.
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Scheinbeim et al. (1979) studied this question.