Citation: Jie Chen, Jing-yu Liu, Yan-guo Li, Yue-sheng Li. SYNDIOSPECIFIC POLYMERIZATION OF STYRENE WITH MULTI-NUCLEAR TITANIUM COMPLEXES[J]. Chinese Journal of Polymer Science, ;2007, 25(3): 325-329. shu

SYNDIOSPECIFIC POLYMERIZATION OF STYRENE WITH MULTI-NUCLEAR TITANIUM COMPLEXES

Received Date: 16 October 2006
Revised Date: 12 December 2006

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°C and the Al/Ti molar ratio is in the low range especially.
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