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采用超声波分散溶液混合法,制备出导电性能优良的多壁碳纳米管(MWNTs)/高密度聚乙烯(HDPE)导电复合材料。研究了不同含量及长径比的MWNTs对HDPE导电性能的影响。结果表明:MWNTs可以显著提高复合材料的导电性,其体积电阻率由1017Ω.m降至107Ω.m;长径比较小的MWNTs分散性较好,并能显著提高材料的PTC(正温度系数效应)强度,当w(MWNTs-60100)=7%(相对于材料总质量而言)时,材料的PTC强度达到2.8。采用差示扫描量热(DSC)法分析了复合材料的结晶行为,证明MWNTs可以成为HDPE的成核剂,并能提高HDPE的成核速率,使晶粒尺寸分布变窄。
The multi-walled carbon nanotubes (MWNTs) / high density polyethylene (HDPE) conductive composites with excellent electrical conductivity were prepared by the ultrasonic dispersing solution mixing method. The effects of MWNTs with different content and aspect ratio on the electrical conductivity of HDPE were investigated. The results show that the MWNTs can significantly improve the conductivity of the composites, and the volume resistivity of the composites decreases from 1017Ω.m to 107Ω.m. MWNTs with smaller aspect ratios have better dispersion and can significantly improve the PTC (positive temperature coefficient effect ) Strength, the material has a PTC strength of 2.8 when w (MWNTs-60100) = 7% (relative to the total mass of the material). The crystallization behavior of the composites was analyzed by differential scanning calorimetry (DSC). It was proved that MWNTs could be used as nucleating agent for HDPE and could increase the nucleation rate of HDPE and narrow the grain size distribution.