Abstract: The changes of poly(vinylidene fluoride-trifluoroethylene) [P(VDF-TrFE)] copolymer induced by irradiation and recrystallization have been studied using FT-IR spectrometry, which help to make clear the irradiation modification mechanism. It is found that the fraction of TTTT conformation drops rapidly with absorbed doses, while both TG and T3G conformations increase. The content of every conformation is a fixed value above a proper absorbed dose implying that the reincrease of polarity in copolymer at high dose is independent of the content increase of all trans TTTT conformation. It might be related to boundary effect of highly cross-linking. On the other hand, the conformational changes in recrystallization treatment are just contrary to those in irradiation effect, and the copolymers are in a more stable state due to the conjugate C=C bonds.

Key words: P(VDF-TrFE), FT-IR spectrum, Irradiation, Recrystallization