CNTs表面包覆PPy对PVC复合材料电导率的影响

Effects of Carbon Nanotube Coated with Polypyrrole on Polyvinyl Chloride Composites' Conductivity

为促进碳纳米管(CNTs)更为有效地应用于聚合物抗静电复合材料,采用原位聚合在CNTs表面生成聚吡咯(PPy)包覆层得到CNT-PPy,其组成通过傅立叶变换红外光谱分析和热重分析确认。CNT-PPy作为导电剂添加到聚氯乙烯(PVC)中制备PVC/CNT-PPy复合材料,对比分析PVC/CNT-PPy复合材料电导率的变化规律可得:PPy修饰CNTs可降低PVC/CNT-PPy复合材料中CNTs的逾渗阈值;当PPy包覆层在CNT-PPy中质量分数约为51.1%,CNT-PPy在复合材料中的质量分数为3%时,制得PVC复合材料的电导率可达到10–7 S/cm量级。由此可知,CNTs表面可控的PPy修饰量对PVC/CNTs复合材料抗静电性能起到显著的提升作用,为CNTs作为高性能导电剂应用提供更多的空间。

In order to explore practical application of carbon nanotubes(CNTs)as novel conductive fillers in the field ofcomposite materials.CNTs coated with polypyrrole(PPy)(CNT-PPy)using the method of in-site polymerization.The compositionwas tested by FTIR,and the weight fraction of PPy on the CNTs surface was calculated according to the TG.Then CNT-PPy wereintroduced into polyvinyl chloride(PVC)composites as a conductive additive.Determinations of electrical conductivity indicate thatthe CNT-PPy decreases the electrical conductive percolation threshold of the PVC composite.Moreover,when the content of PPyin the CNT-PPy is about51.1%and the content of CNT-PPy in the composite is3wt%,the volume conductivity reached10–7S/cm.Therefore,controllable PPy modification on CNTs surface can improve the anti-static performance of PVC/CNTs compositeobviously,which indicates the CNTs exhibits great potential to be used as high-performance conductive materials in many fields.