Dielectric Properties of Relaxor-like Vinylidene Fluoride−Trifluoroethylene-Based Electroactive Polymers
Dielectric Properties of Relaxor-like Vinylidene Fluoride−Trifluoroethylene-Based Electroactive Polymers
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DOI：
10.1021/ma034149h
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发表时间：
2003-05
期刊：
影响因子：
5.5
通讯作者：
V. Bobnar;B. Vodopivec;A. Levstik;M. Kosec;B. Hilczer;Qiming Zhang
中科院分区：
文献类型：
--
作者：
V. Bobnar;B. Vodopivec;A. Levstik;M. Kosec;B. Hilczer;Qiming Zhang
通过测量线性介电常数（e1）和三阶非线性介电常数（e3），研究了聚偏氟乙烯-三氟乙烯共聚物（P（VDF-TrFE））、锆钛酸铅镧（PLZT）-P（VDF-TrFE）复合材料、电子辐照P（VDF-TrFE）共聚物和聚偏氟乙烯-三氟乙烯-氯氟乙烯共聚物（P（VDF-TrFE-CFE）的动态过程.而顺电-铁电转变发生在未辐照的共聚物和复合材料的结晶区，电子辐照的P（VDF-TrFE）共聚物和P（VDF-TrFE-CFE）的介电响应明显不同：在E1和E3中的宽频率分散，弛豫谱的非对称温度演化，最长弛豫时间在有限冻结温度下发散，而最短弛豫时间在有限冻结温度下发散，保持活跃的最低温度，和一个顺电玻璃交叉的温度依赖性。
The dynamic processes in poly(vinylidene fluoride−trifluoroethylene) (P(VDF−TrFE)) copolymer, lead lanthanum zirconate titanate (PLZT)−P(VDF−TrFE) composite, electron-irradiated P(VDF−TrFE) copolymer, and poly(vinylidene fluoride−trifluoroethylene−chlorofluoroethylene) (P(VDF−TrFE−CFE)) terpolymer have been studied by measurements of the temperature and frequency-dependent linear (e1) and third-order nonlinear (e3) dielectric constants. While a paraelectric-to-ferroelectric transition takes place in the crystalline region of the nonirradiated copolymer and composite, electron-irradiated P(VDF−TrFE) copolymer and P(VDF−TrFE−CFE) terpolymer show a significantly different dielectric response: a broad frequency dispersion in e1 and e3, asymmetric temperature evolution of the relaxation spectrum as the longest relaxation time diverges at a finite freezing temperature while the shortest relaxation times remain active down to the lowest temperatures, and a paraelectric-to-glass crossover in the temperature depe...