炭黑／聚丙烯／聚碳酸酯复合材料导电性能和PTC特性  

Conductivity and PTC Phenomenon of CB/PP/PC Composites

作　　者：唐军辉[1] 王纲[1] 周文强[1] 王庆念[2] 王新[1] 

机构地区：[1]青岛科技大学教育部橡塑工程重点实验室,青岛266042 [2]风神轮胎股份有限公司,焦作454003

出　　处：《中国材料科技与设备》2012年第6期42-46,共5页Chinese Materials Science Technology & Equipment

基　　金：山东省自然科学基金资助项目（ZR2011EL008）

摘　　要：以聚丙烯（PP）／聚碳酸酯（PC）共混物为基体，采用不同种类炭黑（CB）填充制备导电复合材料并对其导电性能和PTC特性进行研究。结果表明：在常温时，PP／PC共混基体中PP含量大于40wt％时，材料的电阻率急剧下降；共混比为50：50（wt％）复合材料的电阻率达到最小值。加热时，两者均未出现明显NTC现象，说明PP／PC的共混可以有效的消除NTC效应。但PTC强度仅为1个数量级，远低于PP／CB二元复合材料。CB是影响PTC效应的重要因素之一，达到逾渗值时随着体系CB含量减少PTC效应会增强；乙炔炭黑与炉法CB填充的CB／PP／PC复合材料相比较，前者的体积电阻率较低，而两者的逾渗阈值相近，均为6．6％；乙炔CB为填料的CB／PP／PC三元复合材料的阿C突变温度在140℃附近，以炉法CB为填料时，PTC效应突变点出现在150℃（PC的Tg）附近。DSC分析结果表明，复合材料中PP的结晶度随着CB含量增加呈上升趋势，CB含量为15％时，PP的结晶度为32．75％，对于整个PP／PC／CB体系而言结晶部分的含量较低，因此该体系的PTC效应强度较低。Using immiscible polymeric pair： polypropylene （PP） and polycarbonate （PC） as the matrix, PP/PC/CB ter- nary composites filled with different kinds of CB were prepared and their percolation behaviors and PTC properties were inves- tigated. The results showed that the composites have lower room--resistivities when filled with acetylene CB than when filled with common CB particles. However, both percolation thresholds are nearly 6. 6%, which is not accordance with CB filled single polymer. The resistivity--temperature test results showed that the composites filled with common CB owned more strong PTC intensity than the counterpart, and the critical temperature of PTC mutant varied with CB amount, while the criti- cal temperature of PTC mutant of the composites filled with acetylene CB kept constant at 140 ℃ （near the Tm of PP）. The PTC behaviors shown above can attribute to the different dispersions of CB particles and different crystallinities resulted from the addition of CB.

关 键 词：不相容共混物 炭黑 导电复合材料 逾渗阈值 正温度系数(PTC) 

分 类 号：TQ325[化学工程—合成树脂塑料工业]