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首页> 外文期刊>IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control >Effect of high energy electron irradiation on the electromechanical properties of poly (vinylidene fluoride-trifluorethylene) 50/50 and 65/35 copolymers
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Effect of high energy electron irradiation on the electromechanical properties of poly (vinylidene fluoride-trifluorethylene) 50/50 and 65/35 copolymers

机译：高能电子辐射对聚偏二氟乙烯-三氟乙烯50/50和65/35共聚物的机电性能的影响

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摘要

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.
机译：在从室温到接近熔融温度的不同温度下，对65/35 mol％和50/50 mol％的聚偏二氟乙烯三氟乙烯共聚物薄膜进行了宽剂量的高能电子辐照。提出了辐照对薄膜性能的影响，例如电场引起的应变，介电和极化行为以及机械模量。辐照过的薄膜可表现出非常大的电场感应应变，超过4.5％的纵向应变和3％的横向应变。拉伸膜的横向应变可以与纵向应变相比较。未拉伸膜的应力远小于纵向应变。关于介电和极化行为，我们发现辐照将共聚物从典型的铁电体转变为弛豫铁电体，其中电场下微区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共聚物在产生纵向和横向应变方面均较为理想。提出了一个模型来解释实验结果，即电荷电致伸缩系数（Q）的幅度随结晶度的降低而增加。

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