In-Situ Direct Mechanistic Transformation from RAFT to Living Cationic Polymerization for (Meth)acrylate−Vinyl Ether Block Copolymers
作者:Shinya Kumagai、Kanji Nagai、Kotaro Satoh、Masami Kamigaito
DOI:10.1021/ma101420u
日期:2010.9.28
transformation reaction, the possibility of living cationic polymerization was examined via activation of the thioester bond by Lewis acids, such as SnCl4, EtAlCl2, and ZnCl2. The CH3CH(OiBu)SC(S)SEt/SnCl4-initiating system induced living cationic polymerization of isobutyl vinyl ether (IBVE) in the presence of ethyl acetate (EtOAc) as an additive in toluene at 20 °C to give polymers with controlled molecular
研究了使用三硫代碳酸酯型可逆加成-断裂链转移(RAFT)试剂和(甲基)丙烯酸酯用于RAFT聚合的偶氮引发剂,研究了从活性自由基到阳离子聚合的原位直接机理转变。乙烯醚的顺序活性阳离子嵌段聚合的酸催化剂。在机械转化反应之前,通过路易斯酸如SnCl 4,EtAlCl 2和ZnCl 2活化硫酯键来研究活性阳离子聚合的可能性。CH 3 CH(O i Bu)SC(S)SEt / SnCl 4引发体系在20°C的甲苯中存在作为添加剂的乙酸乙酯(EtOAc)存在下,引发异丁基乙烯基醚(IBVE)的活性阳离子聚合,从而制得具有可控制的分子量和窄的分子量分布(MWD)的聚合物(M w / M n = 1.18)。然后首先使用(CH 3)2进行丙烯酸甲酯(MA)或甲基丙烯酸甲酯(MMA)与IBVE的RAFT共聚。在低温自由基引发剂[2,2'-偶氮双(4-甲氧基-2,4-二甲基戊腈)的存在下,得到C(CN)SC(