Synthesis of well-defined AB20-type star polymers with cyclodextrin-core by combination of NMP and ATRP
Synthesis of well-defined AB20-type star polymers with cyclodextrin-core by combination of NMP and ATRP
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DOI：
10.1002/pola.20837
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发表时间：
2005-09-15
影响因子：
--
通讯作者：
Kakuchi, T
中科院分区：
文献类型：
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作者：
Miura, Y;Narumi, A;Kakuchi, T
采用硝基氧介导聚合(NMP)和原子转移自由基聚合(ATRP)相结合的方法合成了由聚苯乙烯臂和20臂聚甲基丙烯酸甲酯或聚丙烯酸叔丁酯组成的AB(20)型杂臂星形聚合物。使用单-6-[4-(1'-(2'',2'',6'',6-四甲基-1''-哌啶氧基)乙基)苯甲酰氨基]-β-环糊精过乙酸酯(1)进行苯乙烯的NMP，得到具有数均分子量的具有乙酰化β-环糊精(β-CyD)单元的末端官能化聚苯乙烯(预聚物2) (M-n)为11700，多分散性(M-w/M-n)为1.17。预聚物2脱乙酰后，所得聚合物与2-溴异丁酸酐反应以得到末端官能化。聚苯乙烯与 20(2-溴异丁醇)s β-Cyl)，大分子引发剂 4。使用大分子引发剂 4 进行铜 (I) 介导的甲基丙烯酸甲酯 (MMA) 和丙烯酸叔丁酯 (tBA) 的 ATRP。通过 SEC 分级分离所得聚合物，产生具有 β-CyD 核的 AB(20) 型星形聚合物，5。5 的明确结构通过 SEC 和光散射测量表明，重均分子量 (M-w) 为 13,500-65,300，M-w/M-n 为 1.26-1.28。通过用 28 wt% 甲醇钠破坏将臂聚合物与 5 分离，以便分析其特征结构的细节。 (c) 2005 年 Wiley 期刊公司。
The synthesis of an AB(20)-type heteroarm star polymer consisting of a polystyrene arm and 20-arms of poly(methyl methacrylate) or poly(tert-butyl acrylate) was carried out using the combination of nitroxide-mediated polymerization (NMP) and atom transfer radical polymerization (ATRP). The NMP of styrene was carried out using mono-6-[4-(1'-(2 '',2 '',6 '',6-tetramethyl-1 ''-piperidinyloxy)ethyl)benzamido]-beta-cyclodextrin peracetate (1) to afford end-functionalized polystyrene with an acetylated beta-cyclodextrin (beta-CyD) unit (prepolymer 2) with a number-average molecular weight (M-n) of 11700 and a polydispersity (M-w/M-n) of 1.17. After deacetylation of prepolymer 2, the resulting polymer was reacted with 2-bromoisobutyric anhydride to give endfunctionalized. polystyrene with 20(2-bromoisobutyrol)s beta-Cyl), macroinitiator 4. The copper (I)-mediated ATRP of methyl methacrylate (MMA) and tert-butyl acrylate (tBA) was carried out using macroinitiator 4. The resulting polymers were isolated by SEC fractionation to produce AB(20)-type star polymers with a beta-CyD-core, 5. The well-defined structure of 5 with weight-average molecular weight (M-w)s of 13,500-65,300 and M-w/M-n's of 1.26-1.28 was demonstrated by SEC and light scattering measurements. The arm polymers were separated from 5 by destruction with 28 wt % sodium methoxide in order to analyze the details of their characteristic structure. (c) 2005 Wiley Periodicals, Inc.