Abstract: Novel homo-dinuclear silicon bridged cyanoethyl cyclopentadienyl complexes of titanium and zirconium (CH₃)₂Si((η⁵−C₅H₃CH₂CH₂CN)(C₅H₅)MCl₂)₂ (M=Ti(1), Zr(2)) were synthesized and developed for the polymerization of ethylene. Compared with their corresponding mononuclear complexes (η⁵−C₅H₄CH₂CH₂CN)(C₅H₅)MCl₂ (M=Ti(3), Zr(4)), the dinuclear complexes had higher catalytic activity. And the polyethylene produced had a higher molecular weight than that obtained K7with 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 (>10⁶ g PE/mol Zr·h) under low catalyst concentration and high molar ratio of Al/Zr.

Key words: Homo-dinuclear catalyst, Titanocene, Zirconocene, Polyethylene, Chemical engineering

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