Tandem Catalysis of One Metallocene Catalyst Combined with Two Different Cocatalysts for Preparing Branched Polyethylene  

作　　者：杨敏 qin li xiang-liu li bo-wen hu xiao-fang dong jia-yan qu 刘宾元 xi wang xiao-yu hao 

机构地区：[1]Institute of Polymer Science and Engineering, Hebei University of Technology, Tianjin 300130, China

出　　处：《Chinese Journal of Polymer Science》2016年第3期298-306,共9页高分子科学（英文版）

基　　金：financially supported by the Natural Science Foundation of Hebei Province(No.B2015202049);the National Natural Science Foundation of China(Nos.21004017 and 50573018)

摘　　要：Tandem catalytic systems, consisting of ethylene bis（indenyl） zirconium dichloride with two different cocatalysts, alkylaluminum（diethylaluminium chloride or trialkylaluminum） and methylaluminoxane, were employed in preparing branched polyethylene from ethylene as sole monomer. The catalytic system rac-Et（Ind）2Zr Cl2/Al Et2Cl/MAO exhibited high incorporation（29.0/1000C）. The oligomerization and copolymerization reaction conditions in the tandem catalytic system, as well as the different cocatalysts, have effects on the catalytic activity and the properties of the obtained polymer, such as melting temperature, crystallinity, molecular weight and molecular weight distribution. Moreover, the oligomerization reaction condition is the main factor in altering the properties and structures of polyethylene.Tandem catalytic systems, consisting of ethylene bis（indenyl） zirconium dichloride with two different cocatalysts, alkylaluminum（diethylaluminium chloride or trialkylaluminum） and methylaluminoxane, were employed in preparing branched polyethylene from ethylene as sole monomer. The catalytic system rac-Et（Ind）2Zr Cl2/Al Et2Cl/MAO exhibited high incorporation（29.0/1000C）. The oligomerization and copolymerization reaction conditions in the tandem catalytic system, as well as the different cocatalysts, have effects on the catalytic activity and the properties of the obtained polymer, such as melting temperature, crystallinity, molecular weight and molecular weight distribution. Moreover, the oligomerization reaction condition is the main factor in altering the properties and structures of polyethylene.

关 键 词：Tandem catalysis Branched polyethylene Metallocene Alkylaluminum Methylaluminoxane 

分 类 号：O632.12[理学—高分子化学] O643.36[理学—化学]