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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。
The MWNTs / PS-PVC composites were prepared by solution blending method, and the conductivity of the composites was tested. The factors which affect the conductivity of MWNTs / PS-PVC composites and the conductive mechanism were analyzed by the calculation of carrier concentration, mobility and the calculation of conductance activation energy. The results show that when the mass ratio of PS to PVC is 1: 1, the conductive threshold of MWNTs / PS-PVC composites is the lowest. When the mass fraction of MWNTs is 1.5% and the mass fraction of PS in PS-PVC matrix is 50% , The conductivity of MWNTs / PS-PVC composites was improved by 4 orders of magnitude compared with MWNTs / PVC single polymer composites. The formation of nipi structures in MWNTs / PS-PVC composites with superlattice structure similar to that of inorganic compounds in the formation of conductive networks reduced the conductance activation energy of MWNTs / PS-PVC composites and increased the carrier concentration , So MWNTs / PS-PVC composite conductivity significantly increased.