Synthesis of Water-Soluble Polymethacrylates by Living Anionic Polymerization of Trialkylsilyl-Protected Oligo(ethylene glycol) Methacrylates
作者:Takashi Ishizone、Seok Han、Syunsuke Okuyama、Seiichi Nakahama
DOI:10.1021/ma021257f
日期:2003.1.1
y]ethyl methacrylate (2) and 2-[2-[2-[(tert-butyldimethylsilyl)oxy]ethoxy]ethoxy]ethyl methacrylate (3) were polymerized anionically in THF at −78 °C for 2−24 h. The anionic initiator systems included 1,1-diphenyl-3-methylpentyllithium/lithium chloride and diphenylmethylpotassium/diethylzinc. The polymerization of novel tert-butyldimethylsilyl-protected oligo(ethylene glycol) methacrylates, 2 and 3
2- [2 - [(叔丁基二甲硅烷基)氧基]乙氧基]乙酯(2)和2- [2- [2 - [(叔丁基二甲基硅烷基)氧基]乙氧基]乙氧基]乙酯(3)的阴离子聚合中THF在-78°C下放置2-24小时。阴离子引发剂体系包括1,1-二苯基-3-甲基戊基锂/氯化锂和二苯基甲基钾/二乙基锌。在每种情况下,新型的叔丁基二甲基甲硅烷基保护的低聚(乙二醇)甲基丙烯酸甲酯2和3的聚合反应都进行了定量。所得的聚合物具有基于单体与引发剂的摩尔比的预测分子量,以及较窄的分子量分布(Mw / M n <1.1)。通过使用甲基丙烯酸叔丁酯(tBMA)进行的连续嵌段共聚的定量效率,确定了poly(2)和poly(3)的增长碳负离子的稳定性。明确定义的嵌段共聚物,聚(2) -嵌段-聚(的tBMA)和聚(3) -嵌段-聚(的tBMA),获得。聚(2)和聚(3)的三烷基甲硅烷基保护基)在THF水溶液中于0°C下使用2 N HC