摘要
本文首次报导应用稀士配位催化剂聚合甲基丙烯酸甲酯的研究结果。研究了5种配体的钕盐,苯、甲苯、加氢汽油。正己(?)、乙酸乙酯、二氧六环、THF等7种溶剂对聚合的影响以及烷基铝和钕盐的摩尔比、聚合温度等对聚合的影响。所得聚合物含有75％的间同结构。此外,研究了聚合条件对聚合物分子量和结构的影响。聚合物的GPC谱图存在两个明显的分离峰,说明聚合体系中可能有两个活性中心。
It is the first time that methyl methaciylate is polymerized successfully by rare earth coordination catalysts. The affection to polymerization, which is caused by ligand of Nd salt, polymerization solvents, A1/Nd mole ratio, polymerization temperature etc, was studied. The content of syndio tacticity in PMMA is about 75 %, fhe molecular weight and its distribution of PMMA were studied also with Waters-208 GPC instrument. There may be two kinds of catalyst active centres in the polymerization system.
基金
国家自然科学基金
国家教委博士点基金
关键词
稀土催化剂
配位络合聚合
PMMR
MMA
rare earth catalysts
coordination polymerizations methyl methacrylate
