炭黑/碳纤维/ABS电磁屏蔽复合材料的制备及其性能研究  

Research on preparation and properties of carbon black/carbon fiber/ABS electromagnetic shielding composites

作　　者：陈晓燕[1,2] 董发勤[1] 杨玉山[1,3] 郑凯[1,2] 

机构地区：[1]固体废物处理与资源化省部共建教育部重点实验室,四川绵阳621010 [2]西南科技大学材料科学与工程学院,四川绵阳621010 [3]西南科技大学国防科技学院,四川绵阳621010

出　　处：《功能材料》2010年第4期570-573,共4页Journal of Functional Materials

基　　金：四川省科技支撑计划基金资助项目(2008GZ0183)

摘　　要：采用硅烷偶联剂KH550改性炭黑(CB),浓硝酸氧化碳纤维(CF),将表面处理前后的炭黑和碳纤维与丙烯腈-丁二烯-苯乙烯(ABS)树脂通过混炼挤出制备了电磁屏蔽复合材料,考察了炭黑、碳纤维含量及表面处理对复合材料体积电阻率和屏蔽效能的影响。实验结果表明,采用KH550改性炭黑可以达到改性目的,浓硝酸氧化碳纤维后,其表面接上了羰基和羧基。随着炭黑含量增加,复合材料的体积电阻率逐渐下降,且变化规律符合"渗滤效应",在100～1800MHz频率范围内,屏蔽效能逐渐增加,采用1%KH550改性炭黑后,导电性能和屏蔽效能均得到提高。加入碳纤维后,复合材料的导电性能和屏蔽效能均有较大提高,且含量为2%时,分别达到最大值,采用浓硝酸氧化碳纤维后,导电性能得到进一步提高,屏蔽效能提高了1dB左右。In this research,silane coupling agent KH550 modified carbon black（CB）,concentrated nitric acid oxidized carbon fiber（CF）,electromagnetic shielding composites was prepared using modified carbon black and carbon fiber,acrylonitrile-butadiene-styrene （ABS） resin by melt extrusion,affect of content and modification of carbon black and carbon fiber on electric volume resistivity and shielding effectiveness of composites was studied.The experimental results showed that modifying carbon black using KH550 could achieve modification,carbonyl and carboxyl were bonded on the surface of carbon fiber which was oxidized by concentrated nitric acid.electric volume resistivity of composites gradually declined with the increase of carbon black＇s content,and the law accorded with ＂percolation effect＂,shielding effectiveness gradually increased in the frequency range of 100-1800MHz,conductive properties and shielding effectiveness increased after carbon black was modified using 1% KH550.After adding carbon fiber,conductive properties and shielding effectiveness of composites was improved greatly and reached maximum respectively when carbon fiber＇s content was 2%,after carbon fiber was oxidized using concentrated nitric acid,conductive properties was improved further,shielding effectiveness increased by 1dB.

关 键 词：电磁屏蔽 复合材料 体积电阻率 屏蔽效能 

分 类 号：TB34[一般工业技术—材料科学与工程]