Electric conduction in bending electrostriction of polyurethanes
Electric conduction in bending electrostriction of polyurethanes
复制标题
聚氨酯弯曲电致伸缩中的导电
DOI：
10.1063/1.123947
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发表时间：
1999
影响因子：
4
通讯作者：
Y. Amaike
中科院分区：
文献类型：
--
作者：
Masashi Watanabe;T. Hirai;Makoto Suzuki;Y. Amaike
涂有薄金电极的聚氨酯薄膜，通过施加电场而弯曲。由于弯曲变形的程度与施加电场的平方成正比，因此这种现象被认为是弯曲电致伸缩。还通过使用“阻挡电极”和“接触电极”研究了弯曲电致伸缩的机理。作为阻挡电极，在聚氨酯和金电极之间插入聚乙烯绝缘薄膜。结果，聚氨酯膜仅在两个电极接触电极时弯曲。这表明弯曲电致伸缩不是由介电极化引起的，而是与通过聚氨酯的导电有关。因此，弯曲变形被认为是由空间电荷限制电流形成的空间电荷的不对称分布引起的。
Polyurethane films coated with thin gold electrodes bent by the application of an electric field. Because the degree of the bending deformation was proportional to the square of the applied electric field, this phenomenon was considered to be bending electrostriction. The mechanism of the bending electrostriction was also investigated by use of “blocking electrode” and “contacting electrode.” As the blocking electrode, and insulating thin film of polyethylene was inserted between the polyurethane and the gold electrode. As a result, the polyurethane film bent only when both electrodes were contacting electrodes. This shows that the bending electrostriction is not caused by dielectric polarization but is related to electric conduction through the polyurethane. The bending deformation is, thus, suggested to result from an asymmetric distribution of space charge formed by a space-charge-limited current.