Effect of high energy electron irradiation on the electromechanical properties of poly (vinylidene fluoride-trifluorethylene) 50/50 and 65/35 copolymers
Effect of high energy electron irradiation on the electromechanical properties of poly (vinylidene fluoride-trifluorethylene) 50/50 and 65/35 copolymers
复制标题
高能电子辐照对聚偏氟乙烯-三氟乙烯50/50和65/35共聚物机电性能的影响
DOI：
10.1109/58.883518
复制
发表时间：
2000
期刊：
影响因子：
--
通讯作者：
R. Ting
中科院分区：
文献类型：
--
作者：
Zhongyang Cheng;Vivek Bharti;T. Mai;T. Xu;Qiming M. Zhang;T. Ramotowski;Kenneth A. Wright;R. Ting
在室温至接近熔体温度的不同温度下，对聚偏氟乙烯三氟乙烯共聚物（65/35 mol%和50/50 mol%）薄膜进行了大剂量高能电子辐照。研究了辐照对薄膜的电场致应变、介电和极化行为以及力学模量等性能的影响。辐照后的薄膜具有较大的电场致应变，纵向应变大于4.5%，横向应变大于3%。拉伸膜的横向应变可与纵向应变相比较；未拉伸薄膜的纵向应变远小于纵向应变。在介电和极化行为方面，我们发现辐照使共聚物从典型的铁电转变为弛豫铁电，其中微区在电场作用下的行为起着关键作用。在研究的两种共聚物之间，我们发现65/35共聚物在纵向和横向应变产生方面都是首选的。提出了电荷电致伸缩系数(Q)振幅随结晶度的降低而增大的模型。
High energy electron irradiation with a broad range dosage was carried out on poly(vinylidene fluoride trifluorethylene) copolymer 65/35 mol% and 50/50 mol% films at different temperatures from room temperature to a temperature close to the melt temperature. The effect of irradiation on the properties of the films, such as electric field-induced strain, dielectric and polarisation behaviors, and mechanical modulus, is presented. The irradiated films can exhibit a very large electric field-induced strain, more than 4.5% longitudinal strain, and 3% transverse strain. The transverse strain of the stretched film can compare with the longitudinal strain; that of the unstretched film is much smaller than the longitudinal strain. With regard to the dielectric and polarization behaviors, we found that irradiation changes the copolymer from a typical ferroelectric to a relaxor ferroelectric in which the behavior of microregions under the electric field plays the key role. Between the two copolymers studied, we found that the 65/35 copolymer is preferred for both longitudinal and transverse strain generation. A model is proposed to explain the experimental results that the amplitude of the charge electrostrictive coefficient (Q) increases with decreasing crystallinity.