文献类型：期刊文献

英文题名：Preparation of thermostable PBO/graphene nanocomposites with high dielectric constant

作者：Chen, Yi[1];Zhuang, Qixin[1];Liu, Xiaoyun[1];Liu, Jun[1];Lin, Shaoliang[1];Han, Zhewen[1]

机构：[1]E China Univ Sci & Technol, Minist Educ, Key Lab Ultrafine Mat, Shanghai 200237, Peoples R China

年份：2013

卷号：24

期号：24

外文期刊名：NANOTECHNOLOGY

收录：;EI(收录号：20132316393295);WOS:【SCI-EXPANDED(收录号:WOS:000319384300020)】；

基金：The authors express their gratitude to the National Natural Science Foundation of China (NSFC) for their financial support; the contract grant number is 50973028. This project is also supported by the Shanghai Natural Science Foundation (12ZR1407900), Innovation Program of Shanghai Municipal Education Commission (12ZZ049) and the Fundamental Research Funds for the Central Universities.

语种：英文

外文关键词：Solvents - Nanocomposites - Thermogravimetric analysis - Chemical bonds - Chlorine compounds

摘要：In this study, poly(p-phenylene benzobisoxazole) (PBO)/graphene composites were prepared using PBO and poly(4,6-dihydroxymetaphenylenediamine terephthalamide) (PHA)-modified graphene oxide (GO-PHA). PHA is the precursor of PBO. GO-PHA was obtained via chemical coupling reaction of amino-terminated PHA and acyl-chloride-functionalized GO. Partially reduced graphene nanosheets and benzoxazole rings were formed after heating. GO-PHA could be stably dispersed in methane sulfonic acid (MSA), which facilitated its uniform distribution in the PBO matrix. The PBO/graphene nanocomposites were obtained by the dissolution of GO-PHA and PBO in MSA. The thermogravimetric analysis results showed that the PBO/graphene composites had good thermal stability below 400 degrees C. The dielectric constant of the composites increased as the amount of GO-PHA increased, and the percolation threshold was f(c) = 0.037. The nanocomposite had a dielectric constant of 15.8, which was approximately five times larger than that of pure PBO polymer.