【摘要】 本文研究了聚偏氟乙烯（PVDF）的介电、动态力学,热刺激电流和压电性能。在—150℃—120℃范围均观察到四个松弛转变过程,并阐述了它们的机制。 在室温以上,观察到二个松弛峰,与大部分报道不同,而与Kakutani的结果一致,本文还观察到d′₃₁与ε′₃成线性关系,高温下的斜率大于低温的斜率,可能是二种极化机构所致,压电效应的起源与偶极子取向有关。更多还原

【Abstract】 Molecular motions in PVDF were investigated by dielectric measurement, dynamic mechanical measurement, TSC and piezoelectricity. In the temperature range of -150-120℃, four relaxations were observed and their mechanisms were explained.Our experimental results showed that there are 2 peaks above room temperature and are quite different from those reported in literatures but same as the results of Kakutani.The relation between dielectric polarization and piezoelectric polarization was compared. The results indicated thet d’31 increases linearly with ε3’.The slop at high temperature is greater than that at low temperature. It indicates that the piezoelectricity may be originated from orientation of dipoles.更多还原