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The aim of this work is to study the influence of thermal annealing on pyroelectric properties of PVDF and P(VDF-TrFE) 75–25 copolymer. A strong dependence of pyroelectricity decay upon ageing temperature and time is observed. There is no decay for ageing temperatures lower than +50°C for both polymers. A slower decay of P(VDF-TrFE) 75–25 copolymer pyroelectric properties are is observed for ageing temeperatures T a ≤ +110°C, i.e. lower than the Curie transition point (+128°C). The strong decay of the pyroelectric coefficient observed in PVDF is mainly due to shrinkage effects occuring at the α c -transition. The TSC study performed highlighted that changes of crystallinity occur only for high ageing temperatures (> 110°C).
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Ibos et al. (2005) studied this question.
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