拉伸形变下聚苯乙烯/碳纳米管复合材料的结构-导电性能关系  

Structure-Electrical Conductivity Relation of PS/CNT Nanocomposite upon Stretching Deformation

作　　者：任锟[1] 王柯[1] 张琴[1] 傅强[1] 

机构地区：[1]四川大学高分子材料科学与工程学院高分子材料工程国家重点实验室,四川成都610065

出　　处：《塑料工业》2013年第5期88-91,112,共5页China Plastics Industry

基　　金：国家自然科学基金委(批准号21074075);教育部新世纪人才计划(NCET-11-0348)

摘　　要：研究了聚苯乙烯(PS)/碳纳米管(CNT)复合材料的结构-导电性能关系在拉伸形变下的变化并探索其原因。随着碳管含量的增加,复合材料的电导率逐渐增强,并很好符合逾渗理论,意味着碳管数量到达一定程度时碳管间彼此搭接而形成导电填料网络。而当在PS玻璃化转变温度以上(118℃)施加拉伸形变后,复合材料的导电性随着拉伸应变的增加而呈现递减趋势,且在高拉伸应变下偏离线性关系,这主要归结于拉伸取向破坏导电网络以及界面相互作用的增强阻断了碳管间相互搭接。The structure-electric conductivity relationship of polystyrene （PS）/carbon nanotube （CNT） composites during a stretching deformation process and its underlying mechanism were studied. The electric conductivity of PS/CNT nanocomposite increased gradually with the accumulating of CNT, and it was in accordance with the percolation theory, which indicated that the CNTs had mutually connected to form a conductive network at certain critical filler amount. However, the electric conductivity experienced a continuous descending when the stretching was performed above the Tg of PS, 118 ℃; meanwhile, a deviation from the linear relationship of conductivity vs strain was occurred when the strain was high. This phenomenon was mainly ascribed to orientation of carbon nanotubes and improved interfacial interaction arisen from stretching, which hindered the connection of CNTs.

关 键 词：聚苯乙烯 拉伸形变 电导率 导电填料网络 界面作用 

分 类 号：TQ325.2[化学工程—合成树脂塑料工业]