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多壁碳纳米管/聚苯乙烯-聚氯乙烯复合材料的导电特性

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Keywords: 多壁碳纳米管,聚苯乙烯,聚氯乙烯,电导率,载流子浓度,导电机制

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Abstract:

用溶液共混法制得了MWNTs/PS-PVC复合材料,进行了电导率的测试分析。通过对载流子浓度、迁移率的测量以及电导活化能的计算等分析研究了影响MWNTs/PS-PVC复合材料电导率的因素和导电机制。结果表明:当PS与PVC的质量比为1:1时,MWNTs/PS-PVC复合材料的导电阈值最低;当MWNTs的质量分数为1.5%,PS在PS-PVC基体中的质量分数为50%时,MWNTs/PS-PVC复合材料的电导率比MWNTs/PVC单一聚合物复合材料的提高了4个数量级。在导电网络的形成过程中,MWNTs/PS-PVC复合材料中形成的与无机化合物超晶格结构类似的n-i-p-i结构,降低了MWNTs/PS-PVC复合材料的电导活化能,增加了载流子浓度,使MWNTs/PS-PVC复合材料电导率显著提高。

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