Polymerization of MMA catalyzed by different novel mixed ligand lanthanocene ｛ ( Cp ) ( Cl ) LnSchiff-base (THF) ｝, ( COT ) Ln(methoxyethylindenyl) (THF)/Al (i-Bu) 3 systems

• 来源期刊: 中国化学(英文版)
• 年，卷（期）: 2000,（5）
• 页码范围: 759-763
• 页数: 5页
• 语种: 英文

摘要

This article deals that the rare earth metal complexes along with Al (i-Bu)3 can catalyze the polymerization of methyl methacrylate (MMA) into high molecular weight poly(MMA) along with narrow molecular weight distributions (MWD). A typical example wan mentioned in the case of ｛Cp(Cl)Sm Schiff-base(THF)｝ which expresses maximum (conv.%= 55.46 and Mn=354×103) efficiency along with narrow MWD(Mw/Mn＜2) at 60°C. The resulting polymer was partially syndiotactic (＞60%). The effect of the catalyst, temperature, catalyst/MMA molar ratio, catalyst/Al(i-Bu)3 molar ratio on the polymerization of MMA at 60°C were also investigated.