Well-Defined Star-Shaped Rod−Coil Diblock Copolymers as a New Class of Unimolecular Micelles: Encapsulation of Guests and Thermoresponsive Phase Transition
作者:Jeyoung Park、Mihee Moon、Myungeun Seo、Hyungsam Choi、Sang Youl Kim
DOI:10.1021/ma101567p
日期:2010.10.12
poly(arylene ether sulfone) (PAES) as a core, and poly[2-(2-methoxyethoxy)ethyl methacrylate-co-oligo(ethylene glycol) methacrylate] [poly(MEO2MA-co-OEGMA)] as a shell was synthesized by combination of chain-growth condensation polymerization (CGCP) and atom transfer radical polymerization (ATRP). In the presence of 4-arm initiator (1), CGCP of 4-fluoro-4′-hydroxydiphenyl sulfone potassium salt (2)
一系列由聚星形刚柔二嵌段共聚物的(亚芳基醚砜)(PAES)为核心,和聚[2-(2-甲氧基乙氧基)乙基甲基丙烯酸酯共-Oligo(乙二醇)甲基丙烯酸酯] [聚(MEO 2 MA-共-OEGMA)]作为壳用链增长缩聚(CGCP)和原子转移自由基聚合(ATRP)的组合合成。在4-臂引发剂的存在(1),4-氟-4'-羟基二苯基砜钾盐(的CGCP 2经由芳香族亲核取代)(S Ñ AR)反应得到一个明确定义的星形聚合物具有四个氟端基(C5-F和C8-F)。氟基团向ATRP起始位点的转化产生了具有四个溴基团(C5-Br和C8-Br)的大分子引发剂。在大分子引发剂的存在下,MEO 2 MA和OEGMA经由ATRP的无规共聚形成了热响应性壳嵌段,从而产生了所需的具有各种嵌段长度的星形PAES- b-聚(MEO 2 MA- co- OEGMA)嵌段共聚物。星形二嵌段共聚物在水溶液中的动态光散射(DLS)显示出流体动力学直径(D