Multicentered self-immobilized ethylene polymerization catalysts based on functionalized titanium halide salicylaldiminate complexes for the synthesis of ultra-high-molecular-weight polyethylene |
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| Authors: | N I Ivancheva S Ya Khaikin E V Sviridova S P Fedorov D V Sanieva O V Molev I V Oleinik S S Ivanchev |
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| Institution: | 1. St. Petersburg Branch, Boreskov Institute of Catalysts, Siberian Branch, Russian Academy of Sciences, St. Petersburg, Russia
2. Vorozhtsov Novosibirsk Institute, of Organic Chemistry, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia
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| Abstract: | Specific features of ethylene polymerization using a new group of catalytic systems based on ten methylalumoxane-activated titanium halide salicylaldiminato complexes functionalized with ??-vinylalkoxy groups and containing tert-butyl substituents in the phenoxide moiety were studied. The catalytic activity of the new group of activated complexes is strongly affected by the position of the ??-vinylalkoxy functional group and by the number and position of substituents in the phenoxide moiety. These factors determine the ratio of the homogeneous and heterogeneous steps of the polymerization as a result of the catalyst self-immobilization onto the polymer formed, and also the molecular characteristics of the polymer obtained at 20, 40, and 60°C and ethylene pressure of 0.4 MPa. The possibility and conditions of preparing ultra-high-molecular-weight polyethylene with improved morphology were revealed. |
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