SYNDIOSPECIFIC POLYMERIZATION OF STYRENE WITH MULTI-NUCLEAR TITANIUM COMPLEXES  

作　　者：李悦生 

机构地区：[1]State Key Laboratory of Polymer Physics and Chemistry,Changchun Institute of Applied Chemistry,Chinese Academy of Sciences,Changchun 130022,China

出　　处：《Chinese Journal of Polymer Science》2007年第3期325-329,共5页高分子科学（英文版）

基　　金：This work was financially supported by the National Natural Science Foundation of China and SINOPEC (No. 20334030);by the National Basic Research Program of China (No. 2005CB623801).

摘　　要：Two multi-nuclear titanium complexes [Ti（η^5-Cp^＊）Cl（μ-O）]3 （1） and [（η^5-Cp^＊TiCl）（μ-O）2（η^5-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.Two multi-nuclear titanium complexes [Ti（η^5-Cp^＊）Cl（μ-O）]3 （1） and [（η^5-Cp^＊TiCl）（μ-O）2（η^5-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.

关 键 词：Ziegler-Natta polymerization CATALYSTS STYRENE POLYSTYRENE 

分 类 号：TQ316.3[化学工程—高聚物工业]