纳米银-环氧树脂复合电介质的介电特性

Dielectric Property of Nano Silver/Epoxy Resin Composite

研究了纳米银–环氧树脂复合电介质的介电特性,讨论了银粒子的大小和添加量对复合材料介电常数和介质损耗因数的影响,并分析了复合材料的介电温谱。结果表明,复合材料的介电常数和介质损耗因数比纯环氧树脂有所降低;复合材料在损耗温谱中比纯环氧树脂多出一个高温峰,且高温峰的松弛活化能与纳米银粒子在介质中形成的库仑阻塞势垒有较好对应,实验结果表明了在一定尺寸和分布的纳米金属粒子与聚合物形成的复合介质中存在着库仑阻塞效应限制电荷运动的现象。

Dielectric property of nano-Ag/Epoxy resin composite was studied in this paper. The influence of dimension and filling content of Ag particles on permittivity and dielectric power factor （tanδ） of composite was discussed, and the thermal spectrum of composite was analyzed. The results show that after nano Ag particle filling, permittivity and tanδ of composite decrease; there is one more tanδ peak in thermal spectrum of composite, and the relaxation activation energy corresponding with the tanδ peak is related to the Coulomb blockade barrier formed by nano Ag particles in polymer, which certify that it is the Coulomb blockade effect to restrict charge transmission in the nano Ag/Epoxy resin composites.