Preparation of amphiphilic poly(ethylene oxide)-block-polystyrene macrocycles via glaser coupling reaction under CuBr/pyridine system
Preparation of amphiphilic poly(ethylene oxide)-block-polystyrene macrocycles via glaser coupling reaction under CuBr/pyridine system
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DOI：
10.1002/pola.24923
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发表时间：
2011-11
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影响因子：
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通讯作者：
Yannan Zhang;Guowei Wang;Junlian Huang
中科院分区：
文献类型：
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作者：
Yannan Zhang;Guowei Wang;Junlian Huang
通过Glaser偶联将炔丙基遥爪聚环氧乙烷-嵌段聚苯乙烯-嵌段聚环氧乙烷(PEO-b-PS-b-PEO)环化合成两亲性环状聚环氧乙烷-嵌段聚苯乙烯[c-(PEO-b-PS)]。首先通过苯乙烯的活性阴离子聚合和环氧乙烷的开环聚合，首先制备羟基遥爪ABA三嵌段PEO-b-PS-b-PEO，然后将羟基末端与炔丙基溴反应，得到具有炔丙基末端的线性前驱体。最后，室温下，在高稀释度的吡啶中，在CuBr存在下，通过炔丙基格拉泽偶联进行分子内环化，在石油醚中沉淀，直接高效得到c-(PEO-b-PS)。通过GPC、1H NMR和FTIR对环状产物及其相应的线性前体PEO-b-PS-b-PEO进行了表征。 © 2011 Wiley periodicals, Inc. J Polym Sci 第 A 部分：Polym Chem，2011
The amphiphilic cyclic poly(ethylene oxide)-block-polystyrene [c-(PEO-b-PS)] was synthesized by cyclization of propargyl-telechelic poly(ethylene oxide)-block-polystyrene-block-poly(ethylene oxide) (PEO-b-PS-b-PEO) via the Glaser coupling. The hydroxyl-telechelic ABA triblock PEO-b-PS-b-PEO was first prepared by successive living anionic polymerization of styrene and ring-opening polymerization of ethylene oxide, and then the hydroxyl ends were reacted with propargyl bromide to obtain linear precursors with propargyl terminals. Finally, the intramolecular cyclization was conducted in pyridine under high dilution by Glaser coupling of propargyl ends in the presence of CuBr under ambient temperature, and the c-(PEO-b-PS) was directly obtained by precipitation in petroleum ether with high efficiency. The cyclic products and their corresponding linear precursor PEO-b-PS-b-PEO were characterized by means of GPC, 1H NMR, and FTIR. © 2011 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2011