以经处理过的多壁碳纳米管(MW-CNTs)为导热导电填料、三元乙丙橡胶(EPDM)为基体,采用机械共混法制备了MW-CNTs/EPDM复合材料。研究了碳纳米管填料在低填充量(6%)下对复合材料体积电阻率、热导率、热稳定性及力学性能的影响,并通过扫描电镜观察分析MW-CNTs在复合材料中的分布。结果表明:处理后的MW-CNTs在EPDM基质中能形成良好的聚合物填料界面,分散均匀,形成有效的导电导热网链。复合材料的体积电阻率随着MW-CNTs填充量的增加而呈数量级的递减,导热系数随之增加,热稳定性提高,填充后的复合材料具有较好的物理机械性能。

By mechanical blending,thermo-electricity conductive fillers,treated multi-walled carbon nanotubes were added into EPDM base rubber and then MW-CNTs/EPDM composite was prepared.The effect of carbon nanotube fillers with low filling content on the volume resistivity,thermal conductivity,thermal stability and mechanical properties of MW-CNTs/EPDM were investigated,and the distribution of MW-CNTs in the composite was observed by SEM.The results showed that it formed a better interfacial bond between the treated CNTs and EPDM,dispersed uniformly,and formed effective thermo-electricity conductive net chain.The volume resistivity of composite showed a decreasing order of magnitude with increasing the carbon nanotube filler content,the thermal conductivity increased.Improving its thermal stability,the physical and mechanical properties of composites were effectively improved.