Polymerization of Ethylene by SiO2-Supported Two-Component Catalytic Systems Containing Bis(imino)pyridine and Bis(imine) Ligands
Polymer Science Series A
, E-ISSN: 1555-6107
St. Petersburg Department of G.K. Boreskov Institute of Catalysis SB RAS
The polymerization of ethylene initiated by SiO2-supported two-component catalytic systems based on 2,6-bis[1-(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.