凹凸棒粘土对炭黑/环氧复合材料电性能的影响

通过溶液混合法制备了凹凸棒(ATT)/炭黑(CB)/环氧树脂(EP)复合材料。使用紫外可见光光谱仪(UV-Vis)和Zeta电位测试仪对CB和(或)ATT在丙酮溶剂中的分散稳定性进行了研究。使用扫描电子显微镜(SEM)和电阻仪分别研究了不同填料比例以及含量对EP复合材料微观结构和电阻率的影响。结果表明,ATT的加入可以有效增强CB在溶剂中的分散稳定性并促进EP基体中导电网络的形成。当CB与ATT质量比为5∶1时,复合材料的电阻率比不添加ATT时下降了2个数量级;其渗流阈值(1%)(质量分数,下同)小于具有相同填料含量的CB/EP复合材料(1.8%)。最后探讨了ATT对CB/EP复合材料电性能影响的可能机理。

Influence of Attapulgite Clay on Electrical Property of Carbon Black/Epoxy Resin Composites

Attapulgite(ATT)/carbon black(CB)/epoxy(EP) composites were prepared by liquid mixing method.The stability of CB and(or) ATT suspensions in acetone was analyzed by UV-Vis and Zeta potential.The microstructures and volume resistivity of the composites were examined by scanning electron microscope(SEM) and resistance meter.The results indicate that ATT can effectively improve the dispersion of CB in solution and form conductive networks in the matrix.When the mass ratio of CB to ATT is 5∶1,the resistivity of composite is two orders of magnitude lower than that of composites with CB alone.The percolation threshold of ATT/CB/EP composites is 1%,which is lower than that of composites with CB alone(1.8%).The possible mechanism for the influence of ATT on the CB/EP composites was further investigated.