| 单茂钛／MAO催化剂合成间规聚苯乙烯聚合介质的影响 |
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| 引用本文： | 祝方明,贾虹,王群芳,林尚安.单茂钛／MAO催化剂合成间规聚苯乙烯聚合介质的影响[J].中山大学学报(自然科学版),2001,40(2):62-64. |
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| 作者姓名： | 祝方明 贾虹 王群芳 林尚安 |
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| 作者单位： | 中山大学化学与化学工程学院, |
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| 基金项目： | 国家自然科学基金资助项目(2964010);广东省自然科学基金资助项目(984145) |
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| 摘 要： | 单茂钛催化剂五甲基茂基三对甲氧基苯氧基钛Cp^*Ti(OC6H4OCH3)3]/甲基铝氧烷（MAO）／三异丁基铝（TIBA）体系催化苯乙烯聚合，在不同的聚合介质中，表现出不同的催化活性和立构选择性，聚合产物的结构和性质也不一样。
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| 关 键 词： | 茂金属催化剂 甲基铝氧烷 间规聚合 间规聚苯乙烯 聚合介质 工程塑料 催化活性 |
| 文章编号： | 0529-6579(2001)02-0062-03 |
| 修稿时间： | 2000年9月4日 |
Influence of
Polymerization Mediums on Synthesis of Syndiotactic Polystyrene with
Mono-Titanocene/Methylaluminoxane Catalyst |
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| ZHU Fang-ming,JIA Hong,WANG Qun-fang,LIN Shang-an.Influence of
Polymerization Mediums on Synthesis of Syndiotactic Polystyrene with
Mono-Titanocene/Methylaluminoxane Catalyst[J].Acta Scientiarum Naturalium Universitatis Sunyatseni,2001,40(2):62-64. |
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| Authors: | ZHU Fang-ming JIA Hong WANG Qun-fang LIN Shang-an |
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| Abstract: | Syndiotactic polystyrene (sPS) was synthesized in the presence of a mono-titanocene complex of η5-pentamethylcyclopentadienyltri-4-methoxyphenoxy titanium ［Cp*Ti(OC6H4OCH3)3］ activated by methylaluminoxane(MAO).Influences of different polymerization mediums including heptane, toluene, chlorobenze and neat styrene on the activity, syndiotacticity and molecular weight of polystyrene were investigated. The bulk polymerization was the best choice in all cases for producing sPS with the highest activity and molecular weight. In contrast, much better activity and syndiotacticity of yields arose from polymerization in heptane than in the other solvents. Using a solvent with higher dipole moment, such as chlorobenze, lower activity and syndiotacticity were given resulting from the stronger coordination of solvent with Ti(Ⅲ) active species which controlled syndiospecific polymerization of styrene. Aggregated structures of sPS obtained respectively from bulk polymerization and polymerization in heptane used as solvent were different. |
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| Keywords: | mono_titanocene catalyst methylaluminoxane syndiospecific polymerization of styrene syndiotactic polystyrene polymerization medium |
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