微层共挤出PP/PPCB导电复合材料的结构与导电性能  

Structure and Conductivity of PP/PPCB Conductive Composite Prepared by Microlayer Coextrusion

作　　者：李长金[1] 焦志伟[1] 钟雁[1] 杨卫民[1] 

机构地区：[1]北京化工大学机电工程学院,北京100029

出　　处：《塑料工业》2014年第3期98-102,共5页China Plastics Industry

基　　金：国家自然科学基金资助项目(21174015)

摘　　要：利用实验室自行设计制造的微纳叠层共挤出成型设备制备了具有交替层状结构的聚丙烯(PP)/炭黑填充聚丙烯(PPCB)导电复合材料。通过扫描电子显微镜(SEM)和绝缘电阻测试仪研究了微层共挤出复合材料的形态结构及其对复合材料导电性能的影响。研究结果表明,通过微层共挤出技术,PP层与PPCB层沿挤出方向呈现连续交替层状分布,且层与层平行排列;PP/PPCB复合材料的逾渗阀值约为7%,比传统共混方法制备的导电复合材料降低了约5%。对于PP/PPCB结构多层试样,导电效果的好坏由CB含量更高的PPCB体系决定。此外,微层结构复合材料的导电性能与复合材料的层数相关。Polypropylene （PP）/carbon black filled polypropylene （PPCB） conductive composite with alternating layer structure was prepared by microlayer coextrusion. The morphology structure of PP/PPCB microlayer composite and its effect on conductivity were characterized by SEM and insulation resistance test. The results suggested that, through microlayer coextrusion, PP layers and PPCB layers were combined as an ahernatingly multilayered structure along the extrusion direction. The percolation threshold of PP/PPCB conductive composites was about 7%, lower than that of the conductive composites prepared via traditional blending method, and conductive property was related to the number of layers. Furthermore, the conductive property of composite was determined by PPCB system with high CB content for PP/PPCB composite.

关 键 词：聚丙烯 炭黑 导电复合材料 微层共挤出 逾渗阀值 

分 类 号：TQ320.1[化学工程—合成树脂塑料工业]