文献类型：期刊文献

英文题名：Enhanced conductivity in polybenzoxazoles doped with carboxylated multi-walled carbon nanotubes

作者：Zhou, Chengjun[2];Wang, Shanfeng[1];Zhuang, Qixin[2];Han, Zhewen[2]

机构：[1]Univ Tennessee, Dept Mat Sci & Engn, Knoxville, TN 37996 USA;[2]E China Univ Sci & Technol, Sch Mat Sci & Engn, Minist Educ, Key Lab Ultrafine Mat, Shanghai 200237, Peoples R China

年份：2008

卷号：46

期号：9

起止页码：1232

外文期刊名：CARBON

收录：;EI(收录号：20082711349845);WOS:【SCI-EXPANDED(收录号:WOS:000258057000007)】；

语种：英文

外文关键词：Electric conductivity - Conductive films - Thin films - Yarn - Multiwalled carbon nanotubes (MWCN)

摘要：TWO representative polybenzazoles, poly(p-phenylene benzobisoxazole) (PBO) and poly(2,5-benzoxazole) (ABPBO), have been used as matrix materials for fabricating electrically conducting nanocomposite films. in this strategy, pristine multi-walled carbon nanotubes (MWCNTs) were first treated with nitric acid to form carboxylated multi-walled carbon nanotubes (MWCNTs-COOH). Subsequently, MWCNTs-COOH were dispersed efficiently in the methanesulfonic acid (MSA) solution of polybenzazole, sonicated, and then processed into thin films. MWCNTs-COOH in MSA formed an isotropic regime at the concentration of similar to 0.1 wt%. Nanotubes could form net like structures and conductive channels in the polymer matrix to improve electrical conductivity mechanical properties, and thermal stability. At the MWCNT-COOH composition of 5 wt.%, polybenzazole/MWCNT-COOH composite films exhibited a dramatic enhancement in electrical conductivity by 8 orders of magnitude from similar to 10(-12) to 1.6 x 10(-4) S cm(-1) without significantly sacrificing optical transparency. (C) 2008 Elsevier Ltd. All rights reserved.