Nd(O-i-Pr)_3-Al(i-Bu)_3配位催化甲基丙烯酸甲酯聚合反应的研究

STUDY ON THE POLYMERIZATION OF METHYL METHACRYLATE BY COORDINATION CATALYST Nd(O i Pr) 3 Al( i Bu) 3

Ｎｄ（ＯｉＰｒ）３Ａｌ（ｉＢｕ）３配位催化甲基丙烯酸甲酯聚合反应的研究孙俊全（浙江大学高分子科学与工程系杭州３１００２７）（中国科学院长春应化所稀土化学与物理开放实验室长春１３００２２）关键词聚合反应，配位聚合，稀土催化剂，甲基丙烯酸甲酯，...

The polymerization of methyl methacrylate using Nd(O i Pr) 3 Al( i Bu) 3 coordination catalyst system has been investigated. The effects of various alkyl aluminiums, the aging temperature of catalyst, the additive of DMSO and polymerization temperature were studied in detail. It has been found that the highest conversion polymerization was obtained with Al(i Bu) 3 as cocatalyst. Lower aging temperature of catalyst was favoured incresse of both polymerization conversion and molecular weight of PMMA. 1H NMR spectrum of PMMA formed indicated that the most stereostructure of PMMA is syndiotactic. Kinetic study showed that the rate of polymerization is first order with respect to monomer and catalyst concentration. The activation energy of polymerization is 43.5 KJ/mol.