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以绝缘性BaTiO3、半导性SiC和具有导电性的纳米石墨片(GNP)为填料,采用溶液法制备了聚偏氟乙烯(PVDF)基复合材料,着重研究了具有不同性质的填料对PVDF基复合材料介电行为的影响。结果表明:随着不同纳米填料用量的增加,PVDF基复合材料的介电常数都有增大的趋势,尤其是添加半导性SiC和导电性GNP对PVDF基复合材料介电性能改善的效果最明显,其影响程度可由ε′-ε″曲线获知;当SiC和GNP含量高于渗流阈值后,其高频松弛峰趋于平直;采用介电模量的形式可以很好地描述材料在频率依赖下的松弛行为,其松弛激活能随着填料用量的增大而降低,表明填料的加入促进了PVDF基复合材料的极化。
Polyvinylidene fluoride (PVDF) -based composites were prepared by the solution method using insulating BaTiO3, semiconductive SiC and GNP as filler. The effects of filler with different properties on the properties of PVDF-based Effect of Dielectric Properties on Composite Materials. The results show that the dielectric constant of PVDF-based composites increases with the increase of the amount of filler, especially the effect of adding SiC and conductive GNPs on the dielectric properties of PVDF-based composites Obviously, the degree of influence can be obtained by ε’-ε curve. When the content of SiC and GNP is higher than the percolation threshold, the peak of high frequency relaxation tends to be flat. The dielectric modulus can be used to describe the effect of material on frequency Dependence on the relaxation behavior, the relaxation activation energy with the increase in the amount of filler decreased, indicating that the filler to promote the polarization of PVDF-based composites.