中山大学学报(自然科学版)2001，Vol.40Issue(2)：62-64,3.
单茂钛/MAO催化剂合成间规聚苯乙烯聚合介质的影响
Influence of Polymerization Mediums on Synthesis of Syndiotactic Polystyrene with Mono-Titanocene/Methylaluminoxane Catalyst
摘要
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.关键词
茂金属催化剂/甲基铝氧烷/苯乙烯间规聚合/间规聚苯乙烯/聚合介质分类
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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):62-64,3.
