Polymerization of ethylene with (C5Me5)2Zr(NMe2)2 cocatalyzed by common alkyl aluminums |
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| Authors: | Il Kim Chang-Sik Ha |
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| Institution: | Department of Polymer Science and Engineering, Pusan National University, Jangjeon-dong, Geumjeong-gu, Busan 609-735, South Korea |
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| Abstract: | Polymerizations of ethylene have been carried out by using Cp2*Zr(NMe2)2 (Cp*=C5Me5) compound combined with common alkyl aluminums (AlR3) and methylaluminoxane (MAO) as cocatalysts. The AlMe3 cocatalyzed system showed no activity due to the formation of stable but inactive heterodinuclear Cp2*2Zr(μ-Me)2AlMe2]+ cations; however, the bulkier AlR3 AlEt3, Al(i-Bu)3 and Al(i-Bu)2H] cocatalyzed systems showed very high activities. Especially, Cp2*Zr(NMe2)2/Al(i-Bu)3 catalyst showed higher catalytic activity and produced higher molecular weight (MW) polymer than Cp2*Zr(NMe2)2/MAO catalyst, demonstrating both MAO and bulky AlR3 are effective cocatalysts for Cp2*Zr(NMe2)2 compound. |
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| Keywords: | Ethylene polymerization Metallocene Alkyl aluminum cocatalyst Transition metal chemistry |
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