Enhanced electromechanical properties in all-polymer percolative composites
Enhanced electromechanical properties in all-polymer percolative composites
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DOI：
10.1063/1.1702127
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发表时间：
2004-04
影响因子：
4
通讯作者：
Jiangyu Li;Cheng Huang;Qiming Zhang
中科院分区：
文献类型：
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作者：
Jiangyu Li;Cheng Huang;Qiming Zhang
本文讨论了由聚偏氟乙烯-三氟氯乙烯[P（VDF-TrFE-CTFE）]嵌段共聚物和聚苯胺（PANI）导电颗粒组成的全聚合物导电复合材料的电致伸缩和介电常数的增强。采用自洽方法计算了复合材料的介电常数和介电损耗角正切，与实验结果非常一致，并证明电致伸缩增强是由于P（VDF-TrFE-CTFE）基体中的电场波动引起的，当第二相的介电常数远大于基体的介电常数时，电场波动成为主导因素。利用基体中的不均匀场分布估算了复合材料的击穿场强，与实验测量结果吻合较好。该研究可用于设计和优化具有最佳机电性能的电致伸缩复合材料。
In this letter, we discuss the enhanced electrostriction and dielectric constant in an all-polymer percolative composite consisting of poly(vinylidene fluoride-trifluoroethylenechlorotrifluoroethylene) [P(VDF–TrFE–CTFE)] terpolymer matrix and polyaniline (PANI) conductive particles. Using a self-consistent approach, we calculate the dielectric constant and dielectric loss tangent of the composite in excellent agreement with experiments, and demonstrate that the electrostriction enhancement is due to the electric field fluctuation in P(VDF–TrFE–CTFE) matrix, which becomes dominant when the dielectric constant of the second phase is much larger than that of the matrix. The inhomogeneous field distribution in the matrix has also been used to estimate the breakdown field of the composite, which agrees well with experimental measurement. The study could be used to design and optimize electrostrictive composites with optimal electromechanical properties.