CNTs表面包覆PPy对PVC复合材料电导率的影响

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。

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

In order to explore practical application of carbon nanotubes (CNTs) as novel conductive fillers in the field of composite materials. CNTs coated with polypyrrole (PPy) (CNT-PPy) using the method of in-site polymerization. The composition was tested by FTIR,and the weight fraction of PPy on the CNTs surface was calculated according to the TG. Then CNT-PPy were introduced into polyvinyl chloride (PVC) composites as a conductive additive. Determinations of electrical conductivity indicate that the CNT-PPy decreases the electrical conductive percolation threshold of the PVC composite. Moreover,when the content of PPy in the CNT-PPy is about 51.1% and the content of CNT-PPy in the composite is 3wt%,the volume conductivity reached 10–7 S/cm. Therefore,controllable PPy modification on CNTs surface can improve the anti-static performance of PVC/CNTs composite obviously,which indicates the CNTs exhibits great potential to be used as high-performance conductive materials in many fields.