A Novel Catalytic System—NdCl_3·HMPA/Al(i-Bu)_3 for Copolymerization of Isoprene and Styrene  

作　　者：许晓鸣 倪旭峰 沈之荃 

机构地区：[1]Department of Polymer Science & Engineering, Zhejiang University, Hangzhou, Zhejiang 310027, China

出　　处：《Chinese Journal of Chemistry》2004年第7期764-767,共4页中国化学（英文版）

基　　金：Project supported by the Major State Basic Research Development Program (No. 1999064801); the National Natural Science Foundation of China (No. 20254001) and Zhejiang Provincial Natural Science Foundation.

摘　　要：Copolymerization of styrene (St) and isoprene (IP) was carried out with a catalyst system composed of anhydrous lanthanide chloride hexamethyl phosphoramide complex (LnCl3HMPA) and aluminum organic compound (AOC). Among the catalysts examined, catalyst NdCl3HMPA/Al(i-Bu)3 showed a high activity in the copolymerization under certain conditions giving copolymers (5%15% St content) with high cis-1,4 microstructure in IP units (>95%). The effects of HMPA/Nd molar ratio, Al/Nd molar ratio, monomer/Nd molar ratio, St feed ratio, and the reaction time on copolymerization were examined with this catalytic system. The obtained copolymers were characterized by 1H and 13C NMR spectroscopies and gel-permeation chromatography (GPC).Copolymerization of styrene (St) and isoprene (IP) was carried out with a catalyst system composed of anhydrous lanthanide chloride hexamethyl phosphoramide complex (LnCl3HMPA) and aluminum organic compound (AOC). Among the catalysts examined, catalyst NdCl3HMPA/Al(i-Bu)3 showed a high activity in the copolymerization under certain conditions giving copolymers (5%15% St content) with high cis-1,4 microstructure in IP units (>95%). The effects of HMPA/Nd molar ratio, Al/Nd molar ratio, monomer/Nd molar ratio, St feed ratio, and the reaction time on copolymerization were examined with this catalytic system. The obtained copolymers were characterized by 1H and 13C NMR spectroscopies and gel-permeation chromatography (GPC).

关 键 词：ISOPRENE STYRENE COPOLYMERIZATION lanthanide chloride 

分 类 号：O643.3[理学—物理化学]