Effect of high energy electron irradiation on the electromechanical properties of poly(vinylidene fluoride-trifluorethylene) 50/50 and 65/35 copolymers

被引:35
作者
Cheng, ZY [1 ]
Bharti, V
Mai, T
Xu, TB
Zhang, QM
Ramotowski, T
Wright, KA
Ting, R
机构
[1] Penn State Univ, Mat Res Lab, University Pk, PA 16802 USA
[2] USN, Undersea Warfare Ctr, Newport, RI 02841 USA
[3] MIT, Electromagnet & Elect Syst Lab, Cambridge, MA 02139 USA
[4] Univ Cent Florida, Dept Chem, Orlando, FL 32816 USA
基金
美国国家科学基金会;
关键词
D O I
10.1109/58.883518
中图分类号
O42 [声学];
学科分类号
070206 ; 082403 ;
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 Alms, 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 relaxer ferroelectric in which the behavior of microregions under the electric field plays the key role. Between the two copolymers studied, we found that 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.
引用
收藏
页码:1296 / 1307
页数:12
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