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Novel homo dinuclear silicon bridged cyanoethyl cyclopentadienyl complexes of titanium and zirconium (CH 3) 2Si((η 5-C 5H 3CH 2CH 2CN)(C 5H 5)MCl 2) 2 (M=Ti(1), Zr(2)) were synthesized and developed for the polymerization of ethylene. Compared with their corresponding mononuclear complexes (η 5-C 5H 4CH 2CH 2CN)(C 5H 5)MCl 2 (M=Ti(3), Zr(4)), the dinuclear complexes had higher catalytic activity. And the polyethylene produced had a higher molecular weight than that obtained with mononuclear catalysts. Effects of conditions on the ethylene polymerization catalyzed by (2)/MAO (methylaluminoxane) were studied in detail. The catalyst showed a very high activity ( >10 6g PE/mol Zr·h) under low catalyst concentration and high molar ratio of Al/Zr.
Novel homo dinuclear silicon bridged cyanoethyl cyclopentadienyl complexes of titanium and zirconium (CH 3) 2Si ((η 5-C 5H 3CH 2CH 2CN) (C 5H 5) MCl 2) 2 (M = Ti (1), Zr were synthesized and developed for the polymerization of ethylene. Compared to their corresponding mononuclear complexes (η 5-C 5H 4CH 2CH 2CN) (C 5H 5) MCl 2 (M═Ti (3), Zr (4)), the dinuclear complexes had higher catalytic activity. And the polyethylene produced had a higher molecular weight than that obtained with mononuclear catalysts. Effects of conditions on the ethylene polymerization catalyzed by (2) / MAO (methylaluminoxane) were studied in detail. The catalyst showed a very high activity (> 10 6 g PE / mol Zr · h) under low catalyst concentration and high molar ratio of Al / Zr.