【作者】 易回阳； 陈芳； 罗四清；

【Author】 YI Hui-yang CHEN Fang LUO Si-qing (Hubei Key Laboratory of Bioanalytical Technique,Hubei Normal University,Huangshi 435002,China)

【机构】 湖北师范学院生化分析技术湖北省重点实验室；

【摘要】 研究了高密度聚乙烯/多壁碳纳米管复合材料的电阻非线性正温度系数现象(PTC)．结果表明,高密度聚乙烯/碳纳米管复合材料的渗滤域值为3%(质量分数,以下同)左右；当 MWNTs 含量为8．5%时复合材料的 PTC 强度最大,且基本没有后 NTC 效应；经过 16次的加热-冷却循环后复合材料有好的电阻率-温度重现性；对样品 SEM 分析表明 MWNTs 在复合材料中的分布均匀．更多还原

【Abstract】 The non-linear positive temperature coefficient phenomenon of high-density polyethylene/multi walled carbon nano tubes composites was studied.The results showed that as the MWNTs concents reach to 3wt% (Percolation Threshold),the electrical conductivity of the composites changes from insulator to semiconductor.While as the MWNTs concents reach to 8.5wt%,the HDPE/MWNTs composites become a good conductor,its resistivity of the composites increases abruptly when the temperature approaches melting point of the matrix,indicating an existence of positive temperature coefficient(PTC) effect and no the negative temperature coefficient(NTC).It should be noted that the MWNTs is average distribute in the composites by the SEM images.更多还原