Effects of tetraalkylaluminoxane activators on ethylene polymerization catalyzed by iron-based complexes
作者： Qi Wang , Lidong Li , Zhiqiang Fan
DOI: 10.1016/J.EURPOLYMJ.2005.01.008
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摘要: Abstract Five different tetraalkylaluminoxanes, tetraisobutylaluminoxane (A1), ethyltriisobutylaluminoxane (A2), diethyldiisobutylaluminoxane (A3), triethylisobutylaluminoxane (A4) and tetraethylaluminoxane (A5), were prepared to polymerize ethylene in the presence of iron complexes [((2,6-RPh)N C(Me))2C5H3N]FeCl2 (R Me, M1; R iso-Pr, M2). Except M1/A1 M2/A1, all other catalyst systems produced polyethylene with pronounced broad or bimodal molecular weight distribution (MWD). It was demonstrated that low-MW fractions these broad- bimodal-MWD polyethylenes result from chain transfer reaction alkylaluminium containing Al–Et groups activator. As Al/Fe ratio amount activators increased order: A1
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