文献类型：期刊文献

英文题名：Preparation of Solution-Processable Reduced Graphene Oxide/Polybenzoxazole Nanocomposites with Improved Dielectric Properties

作者：Chen, Yi[1];Zhang, Shuo[2];Liu, Xiaoyun[1];Pei, Qibing[3];Qian, Jun[1];Zhuang, Qixin[1];Han, Zhewen[1]

机构：[1]E China Univ Sci & Technol, Sch Mat Sci & Technol, Key Lab Ultrafine Mat, Minist Educ, Shanghai 200237, Peoples R China;[2]Univ Akron, Dept Polymer Sci, Coll Polymer Sci & Polymer Engn, Akron, OH 44325 USA;[3]Univ Calif Los Angeles, Dept Mat Sci & Engn, Soft Mat Res Lab, Los Angeles, CA 90095 USA

年份：2015

卷号：48

期号：2

起止页码：365

外文期刊名：MACROMOLECULES

收录：;EI(收录号：20150500477403);WOS:【SCI-EXPANDED(收录号:WOS:000348619200008)】；

基金：The authors express their gratitude to the Basic Innovation Research Program of Science, Technology Commission of Shanghai Municipality (13JC1402002) for their financial support. This project is also supported by the Innovation Program of Shanghai Municipal Education Commission (12ZZ049), National Natural Science Foundation of China (50973028), Shanghai Natural Science Foundation (12ZR1407900), and China Scholarship Council.

语种：英文

外文关键词：Dimethylformamide - Polymer matrix composites - Chains - Conductive materials - Atom transfer radical polymerization - Dielectric materials - Dispersions - Dielectric losses - Graphene

摘要：The abilities to enhance the degree of orientational freedom of dipole in polymer dielectrics and strengthen the homogeneous dispersion of conductive fillers in matrix are of crucial importance for fabricating composite materials with high dielectric constant, low dielectric loss, low density, and good processability. Compared with conventional main-chain polybenzoxazoles, whose processability and dielectric performance are strictly limited by the conjugated benzoxazole groups on the backbone, improved solubility in dimethylformamide and dielectric constant (4.92) were observed for poly(2-isopropenylbenzoxazole) (P(2-IBO)), due to the high mobility of the dipole (benzoxazole ring) on the side chains. In addition, improved dispersion of conductive graphene nanosheets was achieved by a surface-initiated atom transfer radical polymerization (ATRP) of the N-(2-hydroxyphenyl)methacrylamide (o-HPMAA), the precursor of 2-isopropenylbenzoxazole from reduced graphene oxide (RGO). The nanocomposites of functionalized graphene and P(2-IBO) possess a dielectric constant of 8.35 (approximately 70% higher than that of pure P(2-IBO) at 1 kHz) when the weight fraction of functionalized graphene reaches 0.015, the lowest so far among the reports on dielectric property of the graphene/polybenzoxazole system.