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SYNDIOSPECIFIC POLYMERIZATION OF STYRENE WITH MULTI-NUCLEAR TITANIUM COMPLEXES |
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| Authors: | Jie Chen Jing-yu Liu Yan-guo Li Yue-sheng Li |
| Institution: | State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China |
| Abstract: | 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 |
| Keywords: | Ziegler-Natta polymerization Catalysts Styrene Polystyrene TITANIUM COMPLEXES STYRENE molar ratio range especially polymerization temperature above titanium complexes molecular weight melting temperatures display catalytic activities cocatalyst presence modified methylaluminoxane syndiospecific polymerization styrene |
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