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Thermally stimulated depolarisation measurements have been carried out on P(VDF/HFP) copolymers and alpha -form PVDF homopolymer. Samples were polarised for 30 min under an electric field of 0.5 MV cm -1 . The poling temperature was varied between 10 and 100 degrees C. Three peaks were observed: two between room temperature and 130 degrees C, and a third always present at the poling temperature. Calorimetric measurements have shown an endothermic peak at this temperature. The origin of these three peaks are discussed.
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Latour et al. (1989) studied this question.
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