MWCNTs改善WS2/三元乙丙橡胶复合材料的非线性电导特性与热导性能

通过在一定量的纳米WS₂中添加极少量的多壁碳纳米管（MWCNTs），形成MWCNTs-WS₂复配填料，采用双辊开炼机将三元乙丙橡胶（EPDM）与不同配比的复配填料混合制备了不同MWCNTs含量的MWCNTs-WS₂/EPDM复合材料。并研究了极少量的MWCNTs添加对MWCNTs-WS₂/EPDM复合材料非线性电导性能、直流击穿性能和导热性能的影响。结果表明，极少量的MWCNTs对MWCNTs-WS₂/EPDM复合材料在25℃时的非线性电导特性起到明显的增强作用，且随着MWCNTs含量的增加，复合材料非线性电导特征有明显的规律性变化；由于MWCNTs自身的高电导率和电导正温度系数效应，MWCNTs-WS₂/EPDM复合材料电导率随电场强度的变化趋势在80℃时不再表现非线性特征。另外，极少量的MWCNTs对MWCNTs-WS₂/EPDM复合材料的热导率有明显地改善。 

Improved nonlinear conductivity and thermal conductivity of WS2/ethylene propylene diene monomer composites with MWCNTs

Small amount of multi-walled carbon nanotubes (MWCNTs) was mixed with certain content of WS₂ to fabricate a composite filler, then mixing which with ethylene propylene diene monomer (EPDM) to get the MWCNTs-WS₂/EPDM composites with different MWCNTs content. The composite samples were prepared by using a mixing process and the nonlinear conductivity, direct current dielectric breakdown strength and thermal conductivity of MWCNTs-WS₂/EPDM composites were investigated. The results show that with the help of WS₂, very small amount of MWCNTs enhances the nonlinear conductivity of MWCNTs-WS₂/EPDM composites obviously at 25℃, and the improvement is regularly by increasing the content of MWCNTs. Because of the excellent conductivity of MWCNTs and the electrical conduction positive temperature coefficient effect of itself, the nonlinear conductivity of MWCNTs-WS₂/EPDM composites decreases with the increasing of temperature. There is no nonlinear change for the conductivity of MWCNTs-WS₂/EPDM composites in increasing electric field at 80℃.The thermal conductivity of MWCNTs-WS₂/EPDM composites is improved obviously with the help of MWCNTs.