文献类型：期刊文献

英文题名：Functionalization of Graphene Oxide Towards Thermo-Sensitive Nanocomposites via Moderate In Situ SET-LRP

作者：Deng, Yan[1,2];Li, Yongjun[1,2];Dai, Jing[3];Lang, Meidong[3];Huang, Xiaoyu[1,2]

机构：[1]Chinese Acad Sci, Shanghai Inst Organ Chem, Key Lab Organofluorine Chem, Shanghai 200032, Peoples R China;[2]Chinese Acad Sci, Shanghai Inst Organ Chem, Lab Polymer Mat, Shanghai 200032, Peoples R China;[3]E China Univ Sci & Technol, Sch Mat Sci & Engn, Minist Educ, Key Lab Ultrafine Mat, Shanghai 200237, Peoples R China

年份：2011

卷号：49

期号：22

起止页码：4747

外文期刊名：JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000296255900005)】；

基金：The authors thank the National Natural Science Foundation of China (20904065), Knowledge Innovation Program of the Chinese Academy of Sciences (KGCX2-YW-231-6), Shanghai Rising Star Program (11QH1402800), Shanghai Scientific and Technological Innovation Project (10431903000), and Fundamental Research Funds for the Central Universities (WD0913008).

语种：英文

外文关键词：graphene; nanocomposites; SET-LRP; synthesis

摘要：A mild and efficient strategy is presented for growing thermo-sensitive polymers directly from the surface of exfoliated graphene oxide (GO). This method involves the covalent attachment of Br-containing initiating groups onto the surface of GO sheets followed by in situ growing poly[poly(ethylene glycol) ethyl ether methacrylate] (PPEGEEMA) via single-electron-transfer living radical polymerization (SET-LRP). Considering the lack of reactive functional groups on the surface of GO, exfoliated GO sheets were subjected to an epoxide ring opening reaction with tris(hydroxymethyl) aminomethane (TRIS) at room temperature. The initiating groups were grafted onto TRIS-GO sheets by treating hydroxyls with 2-bromo-2-methylpropionyl bromide at room temperature. PPEGEEMA chains were synthesized by in situ SET-LRP using CuBr/Me6TREN as catalytic system at 40 degrees C in H2O/THF. The resulting materials were characterized using a range of testing techniques and it was proved that polymer chains were successfully introduced to the surface of GO sheets. After grafting with PPEGEEMA, the modified GO sheets still maintained the separated single layers and the dispersibility was significantly improved. This TRIS-GO-PPEGEEMA hybrid material shows reversible self-assembly and deassembly in water by switching temperature at about 34 degrees C. Such smart graphene-based materials promise important potential applications in thermally responsive nanodevices and microfluidic switches. (C) 2011 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 49: 4747-4755, 2011