Immobilization and activation of 2,6-bis(imino)pyridyl Fe, Cr and V precatalysts using a MgCl2/AlRn(OEt)3−n support: Effects on polyethylene molecular weight and molecular weight distribution
作者： Rubin Huang , Nileshkumar Kukalyekar , Cor E. Koning , John C. Chadwick
DOI: 10.1016/J.MOLCATA.2006.07.030
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摘要: Abstract Ethylene polymerizations carried out with various bis(imino)pyridyl iron, chromium and vanadium complexes immobilized on a MgCl2/AlRn(OEt)3−n support gave relatively broad polyethylene molecular weight distributions in the case of but high very narrow distribution vanadium, indicative single active species. The MWD was confirmed by melt rheometry. Similar results were obtained after reaction complex LVCl3 (6) MeLi or AlEt3, where alkylation pyridine ring gives L′VCl2 (7). In chromium, bimodal obtained, evidence incomplete catalyst immobilization. weights iron strongly dependent substituents ligand, somewhat higher than have been homogeneous polymerization. contrast, much that those previously under conditions. all cases, activities catalysts found
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