不同比表面积CCB对EVA/CCB半导电复合材料性能的影响  

Influence of CCB with Different Specific Surface Areas on the EVA/CCB Semi-conductive Composites

作　　者：刘奇伟[1] 李锦春[1] 李钧[1] 

机构地区：[1]常州大学材料科学与工程学院,江苏常州213164

出　　处：《塑料工业》2014年第12期93-97,共5页China Plastics Industry

基　　金：江苏省产学研联合创新研究项目(BY2013024-09)

摘　　要：采用熔融共混法制备了乙烯-醋酸乙烯酯共聚物(EVA)/导电炭黑(CCB)二元复合材料。研究了三种CCB的比表面积、粒径及含量对复合材料的体积电阻率、微观形貌、流变性能和拉伸强度的影响。结果表明,随着CCB含量的增加,EVA/CCB复合材料的体积电阻率下降;其中具有双峰粒径分布且分布范围最宽的CCB填充的EVA复合材料导电性能最佳,CCB(比表面积65 m2/g)质量分数仅为20%时,其体积电阻率为1.2×104Ω·cm,材料由绝缘体转变为半导体。微观形貌结果表明,CCB在EVA基体中的含量越高,CCB粒子之间的间距越小。在EVA中添加CCB会使体系复数黏度和储能模量增大。力学性能测试结果表明,CCB填充EVA树脂使EVA/CCB复合材料的拉伸强度略有下降,断裂伸长率呈下降趋势。Ethylene vinyl acetate （EVA）/conductive carbon black （CCB） composite were prepared by melt blending.The effects of three CCB with different specific surface areas and particle size,CCB content on the properties of composites （volume resistivity,microstructure,rheological properties and mechanical properties） were investigated.The test results of volume resistivity indicated that the volume resistivity of EVA/CCB composites would drop with the increase of CCB content; And the CCB with a bimodal particle size distribution and widest distribution filled EVA composites had the best conductive properties,the volume resistivity value reached 1.2 × 10^4 Ω · cm when the mass fraction of CCB was 20 wt%,the composites transformed into semiconductor.The results of microstructure indicated that by increasing the CCB content in EVA,the space between the CCB particles was reduced.The results indicated that CCB filled EVA would make composites complex viscosity and storage modulus increase.The test results of mechanical properties indicated that the tensile strength of EVA/CCB composites decreased slightly,and its elongation at break showed a downward trend.

关 键 词：导电炭黑 乙烯-醋酸乙烯酯共聚物 比表面积 粒径 复合材料 导电性能 

分 类 号：O631.23[理学—高分子化学]