SYNDIOSPECIFIC POLYMERIZATION OF STYRENE WITH MULTI-NUCLEAR TITANIUM COMPLEXES

被引:0
作者
李悦生
机构
[1] Changchun 130022
[2] China
[3] Chinese Academy of Sciences
[4] State Key Laboratory of Polymer Physics and Chemistry Changchun Institute of Applied Chemistry
基金
中国国家自然科学基金;
关键词
Ziegler-Natta polymerization; Catalysts; Styrene; Polystyrene;
D O I
暂无
中图分类号
TQ316.3 [聚合反应过程];
学科分类号
0805 ; 080502 ;
摘要
Two multi-nuclear titanium complexes [Ti(η5-Cp*)Cl(μ-O)]3 (1) and [(η5-Cp*TiCl)(μ-O)2(η5-Cp*Ti)2(μ-O)(μ-O)2]2Ti (Cp*=C5Me5) (2) have been investigated as the precatalysts for syndiospecific polymerization of styrene. In the presence of modified methylaluminoxane (MMAO) as a cocatalyst, complexes 1 and 2 display much higher catalytic activities towards styrene polymerization, and produce the higher molecular weight polystyrenes with higher syndiotacticities and melting temperatures (Tm) than the mother complex Cp*TiCl3 does when the polymerization temperature is above 70℃and the Al/Ti molar ratio is in the low range especially.
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页码:325 / 329
页数:5
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