聚丙烯混杂碳质填料复合材料的导电性能

Electrical Conductivity of Polypropylene/Carbonaceous Filler Hybrid Composites

石墨烯(GNP)、炭黑(CB)、碳纳米管(CNT)等碳质填料具备高的导电性能,通过在聚合物中混杂碳质填料制备功能性复合材料逐渐成为研究焦点。两种或多种碳质填料能够通过填料之间的协同作用在聚合物内部形成导电填料网络,进而提高复合材料的导电性能。采用熔融共混法制备了聚丙烯(PP)混杂碳质填料复合材料,研究了不同的填料配比以及填料网络对PP混杂碳质填料复合材料的导电率和和微观形态的影响。结果表明,单一填料复合材料中,含有5%CNT的PP复合材料的电导率最高,电导率达到0.793 S/cm;两种碳质填料混杂的复合材料,当CNT∶CB的配比为4∶1时,PP复合材料的电导率最高为0.339 S/cm;三种碳质填料混杂的复合材料,当GNP∶CNT∶CB的配比为2∶2∶1时,PP复合材料的电导率最高为0.317 5 S/cm。固定填料总含量为5%,通过增加其他填料,减少CNT的用量,减小成本的同时,电导率相差无几,具有不同形态的碳质填料在熔融共混的过程中互相缠结,CNT作为连接的桥梁,促进了填料网络形成。研究结果为聚合物复合材料导电性能的研究提供了方向。

Graphene(GNP),carbon black(CB),carbon nanotubes(CNT)and other carbonaceous fillers had high electrical conductivity.The preparation of functional composites by mixing carbonaceous fillers in polymers had gradually become the focus of recent research.Two or more carbonaceous fillers could form a conductive filler network in the polymer through the synergistic effect between fillers,so as to improve the conductivity of the composites.Polypropylene(PP )/carbonaceous filler hybrid composites were prepared by melt blending method.The effects of different filler ratio and filler percolation network structure on electrical conductivity and surface morphology of PP composites were studied.The results show that the conductivity of PP composite containing 5%CNT is the highest,and the conductivity could reach 0.793 S/cm.When the ratio of CNT∶CB is 4∶1,the highest conductivity of PP composite is 0.339 S/cm.When the ratio of GNP∶CNT∶CB is 2∶2∶1,the highest conductivity of PP composite is 0.317 5 S/cm. The total content of fixed filler is 5%.By adding other fillers,the amount of CNT is reduced and the cost is reduced.At the same time,the conductivity is almost the same.Carbonaceous fillers with different forms entangle with each other in the process of melt blending,CNT as a bridge for connection,which promotes the formation of filler network.The results provide a direction for the study of electrical conductivity of polymer composites.