Polymerization of ethylene by SiO2-supported two-component catalytic systems containing bis(imino)pyridine and bis(imine) ligands |
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Authors: | S S Ivanchev N I Ivancheva S Ya Khaikin E V Sviridova D G Rogozin |
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Institution: | (1) Boreskov Institute of Catalysis (St. Petersburg Branch), Siberian Division, Russian Academy of Sciences, pr. Dobrolyubova 14, St. Petersburg, 197198, Russia |
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Abstract: | The polymerization of ethylene initiated by SiO2-supported two-component catalytic systems based on 2,6-bis1-(2,4-dimethyl-6-cyclohexylphenylimino)ethyl]pyridine iron (II) chloride (I) and 1,2-bis(2-cyclohexyl-4,6-dimethylphenylimino)acenaphthene] nickel bromide (II) was studied. Methylaluminoxane was used as a cocatalyst during support. It was shown that the activity of two-component catalytic systems and the molecular mass and short-chain branching of polyethylene samples depend on the supporting procedure: simultaneous immobilization of components I and II, separate immobilization of components on the support (first I, then II, and vice versa), and the use of a mixture of components I and II immobilized separately on SiO2. |
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