Graft Copolymers by Combined Anionic and Cationic Polymerizations Based on the Homopolymerization of a Bifunctional Monomer
Graft Copolymers by Combined Anionic and Cationic Polymerizations Based on the Homopolymerization of a Bifunctional Monomer
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基于双官能单体均聚的阴离子和阳离子组合聚合的接枝共聚物
DOI：
10.1021/ma971547
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发表时间：
1998
期刊：
影响因子：
--
通讯作者：
E. Ruckenstein
中科院分区：
文献类型：
--
作者：
Hongming Zhang;E. Ruckenstein
双官能单体甲基丙烯酸 2-(乙烯基氧基)乙酯 (VEMA) 可进行阴离子和阳离子聚合。以1,1-二苯基己基锂（DPHL）为引发剂，四氢呋喃（THF）为溶剂，在-60℃的低温下，VEMA甲基丙烯酰基的CC双键顺利进行阴离子聚合，无交联或副反应。该聚合物具有可控的分子量和窄的分子量分布（Mw/Mn = 1.06−1.12）。另一方面，VEMA的乙烯基氧基的CC双键可以发生阳离子聚合。在弱路易斯碱 THF 存在下，使用甲基丙烯酸 2-[1-乙酰氧基乙氧基]乙酯 (4)/EtAlCl2 作为引发剂，制备了具有受控分子量和窄分子量分布 (Mw/Mn = 1.11−1.13) 的聚合物。采用两种方法来制备接枝共聚物。 (A) 阴离子制备的 VEMA 聚合物在猝灭聚合后从溶液中分离出来，并通过冷冻干燥纯化；然后维...
The bifunctional monomer 2-(vinyloxy)ethyl methacrylate (VEMA) was polymerized both anionically and cationically. Using 1,1-diphenylhexyllithium (DPHL) as initiator, tetrahydrofuran (THF) as solvent and the low temperature of −60 °C, the CC double bond of the methacryloyl group of VEMA underwent smoothly anionic polymerization, without cross-linking or side reactions. The polymer had a controlled molecular weight and a narrow molecular weight distribution (Mw/Mn = 1.06−1.12). On the other hand, the CC double bond of the vinyloxy group of VEMA can undergo cationic polymerization. A polymer with controlled molecular weight and narrow molecular weight distribution (Mw/Mn = 1.11−1.13) was prepared using 2-[1-acetoxyethoxy]ethyl methacrylate (4)/EtAlCl2 as initiator in the presence of THF, a weak Lewis base. Two methods were employed to prepare graft copolymers. (A) The anionically prepared polymer of VEMA was separated from solution after quenching the polymerization and purified by freeze-drying; then the vi...