文献类型：期刊文献

英文题名：Novel amphiphilic and photo-responsive ABC 3-miktoarm star terpolymers: synthesis, self-assembly and photo-responsive behavior

作者：Sun, Wuqiong[1];He, Xiaohua[1];Gao, Chunyan[1];Liao, Xiaojuan[1];Xie, Meiran[1];Lin, Shaoliang[2];Yan, Deyue[3]

机构：[1]E China Normal Univ, Dept Chem, Shanghai 200241, Peoples R China;[2]E China Univ Sci & Technol, Sch Mat Sci & Engn, Shanghai Key Lab Adv Polymer Mat, Shanghai 200237, Peoples R China;[3]Shanghai Jiao Tong Univ, Sch Chem & Chem Engn, Shanghai 200240, Peoples R China

年份：2013

卷号：4

期号：6

起止页码：1939

外文期刊名：POLYMER CHEMISTRY

收录：;EI(收录号：20130916054099);WOS:【SCI-EXPANDED(收录号:WOS:000315167700024)】；

基金：This work was financially supported by the National Natural Science Foundation of China (21174038 and 51103044) and the Shanghai Natural Science Foundation of China (10ZR1409500). Support from Projects of Shanghai Municipality (12JC1403102 and 11QA1401600), the Shanghai Key Laboratory of Advanced Polymer Materials (ZD20100101) and the Large Instruments Open Foundation of East China Normal University are also appreciated.

语种：英文

外文关键词：Polyethylene glycols - Sodium Azide - Stars - Azobenzene - Self assembly - Bromine compounds - Hydrophobicity - Atom transfer radical polymerization - Synthesis (chemical)

摘要：Novel amphiphilic and photo-responsive ABC 3-miktoarm star terpolymers consisting of hydrophilic poly(ethylene glycol) monomethyl ether (MPEG), hydrophobic polystyrene (PS) and azobenzene-containing poly[6-(4-methoxy-azobenzene-4'-oxy)hexylmethacrylate] (PMMAZO) were synthesized by a combination of atom transfer radical polymerization (ATRP) and click chemistry. MPEG was first end-capped by an epoxide ring, which was opened by sodium azide for the preparation of the modified MPEG bearing reactive azide group and hydroxyl group (MPEG-(OH)(N-3)). Click chemistry was then performed to conjugate alpha-alkynyl-omega-diethylamino-PS and MPEG-(OH)(N3) for the preparation of a block copolymer with reactive hydroxyl group at the junction point (MPEG(-OH)-b-PS), which was further esterified with 2-bromoisobutyryl bromide to prepare the macroinitiator with reactive bromo group at the central point (MPEG(-Br)-b-PS). Finally, an azobenzene-containing PMMAZO arm was introduced into the diblock copolymer by ATRP of 6-(4-methoxy-azobenzene-4'-oxy)hexylmethacrylate monomer (MMAZO) initiated with macroinitiator MPEG(-Br)-b-PS for the preparation of ABC 3-miktoarm star terpolymer (MPEG)(PS)(PMMAZO). The self-assembled morphologies of the star terpolymers in selective solvents changed from bowl-shaped structures to multibowl-shaped structures with the lengthening of the hydrophobic chains (PS or PMMAZO). Photo-responsive investigation showed that the different aggregation states had a great effect on the photo-induced isomerization behaviors. These results may provide guidelines for the design of effective photoresponsive anisotropic materials.