锌/聚偏氟乙烯复合材料介电性能研究
首发时间:2012-12-26
摘要:通过溶液共混法制备了以聚偏氟乙烯(PVDF)为基体,以导电性良好的金属锌(Zn)为填料的聚合物基两相复合材料。研究了复合材料的介电性能随Zn的体积分数及测试频率的变化,并通过场发射扫描电镜(FE-SEM)分析了Zn填料在PVDF基体中的分散性及两相间的界面相容性,又依据渗流理论计算了复合材料的渗流阈值。实验结果表明:Zn/PVDF复合材料的介电常数随Zn体积分数的增加而升高,最高值可达95(100 Hz),而其原因得益于复合材料内部Zn与PVDF所形成的大量微电容。此外,由渗流公式得出上述复合材料的渗流阈值大约为15.6%。
关键词: 复合材料 聚偏氟乙烯 锌 介电性能 微观结构 渗流阈值
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Research on dielectric performance of zinc/polyvinylidene fluoride composites
Abstract:Two-phase polymer composites comprising of conductive metal zinc (Zn) and polyvinylidene fluoride (PVDF) have been prepared through the method of solution blending. Dielectric properties of the Zn/PVDF composites as a function of the volume fraction of Zn (fZn) and frequency were investigated,and the dispersion state of Zn filler in PVDF matrix and their interface compatibility were analyzed by field-emission scanning electron microscopy (FE-SEM). Furthermore, the percolation threshold of above composites was calculated according to the theory of percolation. The results shown that the dielectric constant of Zn/PVDF composites was increased with the fZn significantly, and the maximum value was as high as 95 (100 Hz). The dielectric behavior could be attributed to the contribution of micro-capacitors formed by Zn fillers and PVDF matrix. By use of the percolation formula, the percolation threshold of Zn/PVDF composites was confirmed as 15.6%.
Keywords: composites polyvinylidene fluoride zinc dielectric properties microstrcture percolation threshold
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