Synthesis of well-defined star-branched polymers by coupling reactions of polymer anions consisting of two polymer chains with chain-end-multifunctionalized polystyrenes with benzyl bromide moieties
Synthesis of well-defined star-branched polymers by coupling reactions of polymer anions consisting of two polymer chains with chain-end-multifunctionalized polystyrenes with benzyl bromide moieties
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DOI：
10.1021/ma030118a
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发表时间：
2003-08-12
期刊：
影响因子：
5.5
通讯作者：
Tokuda, Y
中科院分区：
文献类型：
--
作者：
Hirao, A;Tokuda, Y
为了合成星形支化聚合物，我们开发了一种新方法，使用由相同或不同的两个聚合物链组成的聚合物阴离子（M-w = ca. 10 kg/mol）进行链端多官能化聚苯乙烯与4、8和16个苄基溴部分的偶联反应。偶联反应有效地进行，以大于 85% 的分离产率提供由聚苯乙烯 (A) 和聚 (4-三甲基甲硅烷基苯乙烯) (B) 链段组成的 9、17、和 33 臂规则星形支化聚苯乙烯以及 A(5)B(4)、A(9)B(8) 和 A(17)B(16) 不对称星形。然而，当使用具有 32 个苄基溴部分的链端官能化聚苯乙烯或高分子量聚合物阴离子（M-w = 20.0 kg/mol）时，偶联反应的产率很高，但不定量。
To synthesize star-branched polymers, we have developed a new methodology of using polymer anions (M-w = ca. 10 kg/mol) consisting of the same or different two polymer chains in the coupling reaction of chain-end-multifunctionalized polystyrenes with 4, 8, and 16 benzyl bromide moieties. The coupling reactions efficiently proceeded to afford 9-, 17-, and 33-arm regular star-branched polystyrenes as well as A(5)B(4), A(9)B(8), and A(17)B(16) asymmetric stars consisting of polystyrene (A) and poly(4-trimethyl-silylstyrene) (B) segments in greater than 85% isolated yields. However, the yields of the coupling reactions were high but not quantitative when either chain-end-functionalized polystyrene with 32 benzyl bromide moieties or a high molecular weight polymer anion (M-w = 20.0 kg/mol) was used.