Polymerization of styrene catalyzed by rare earth Schiff base complexes

• 来源期刊: 中国高等学校学术文摘·化学
• 关键词: rare earth Schiff base complex styrene polymerization
• 年，卷（期）: 2008,（1）
• 页码范围: 6-9
• 页数: 4页
• 语种: 英文
• DOI: 10.1007/s11458-008-0003-6

摘要

The rare earth Schiff base complex Nd (H2Salen)2Cl3·2C2H5OH was synthesized by a simple and convenient method and characterized by IR and elemental analysis. The catalyst system composed of Nd (H2Salen)2Cl3·2C2H5OH/AI(i-Bu)3/CCl4 is effective for the polymerization of styrene (St). The optimum conditions are as follows: [St]/[Nd] = 1000, [CCl4]/[Nd] =9, [Al]/[Nd] = 30, and polymerization at 50℃ for 20 h. The resulting polystyrene was characterized by NMR and GPC. The results of NMR show that the polymer obtained had a stereoregularity with 52.3% isotacticity and 47.7% syndiotacticity without any random structure.