Living Group Transfer Polymerization of Renewable α-Methylene-γ-butyrolactones Using Al(C<sub>6</sub>F<sub>5</sub>)<sub>3</sub> Catalyst
作者:Lu Hu、Jianghua He、Yuetao Zhang、Eugene Y.-X. Chen
DOI:10.1021/acs.macromol.7b02647
日期:2018.2.27
Mn vs monomer-to-initiator ratio, chain extension experiments, and synthesis of well-defined random, diblock, and triblock copolymers. A combined mechanistic study through isolation and characterization of single-monomer-addition intermediates that simulate the active propagating species, polymerization kinetics, and characterization of polymer chain ends has led to a polymerization mechanism. The polymerization
在这里,我们报告了共轭极性烯烃的室温基团转移聚合反应,包括线性甲基丙烯酸甲酯(MMA)以及生物可再生的环状γ-甲基-α-亚甲基-γ-丁内酯(MMBL)和α-亚甲基-γ-丁内酯(MBL),由甲硅烷基乙烯酮缩醛(SKA)/ Al(C 6 F 5)3([Al])体系及其聚合机理进行详细研究。通过SKA / [Al]进行的MMA聚合不受控制,而通过庞大的SKA(i Bu SKA)/ [Al]系统进行的MMBL聚合仍在继续进行,因此产生了具有明确分子量(M n高达179 kg mol –1),分子量分布窄(Đ低至1.02)和高启动效率(I * ≥97%)。MMBL的活性聚合是通过五项证据建立的,包括可预测的聚合物M n和低Đ值,聚合物M n与单体转化率的线性增加,聚合物M n的线性增加。与单体与引发剂的比例,扩链实验以及定义明确的无规,二嵌段和三嵌段共聚物的合成。通过分离和表征单单体加成中间体(模拟