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Activity and stereospecificity of cobalt-methylaluminoxane catalyst in butadiene polymerization
Abstract Butadiene polymerization in aliphatic and aromatic solvents mediated by a preliminarily formed catalyst consisting of cobalt 2-ethylhexanoate, methylaluminoxane, and diene was studied. It was shown that the catalyst was active at a molar ratio of methylaluminoxane: cobalt: diene = 75−200:1:20, yielding high-molecular-mass polymers (intrinsic viscosity, 1.8–2.7 dl/g) containing at least 98% cis-1,4-units. Preliminary formation of the catalyst was found to increase its activity in butadiene polymerization at a low Al:Co ratio. In this case, the catalyst retains its high stereospecificity (the amount of cis-1,4-units in the polymer reaches 98% and more) independently of the nature of the solvent used for polymerization.
Activity and stereospecificity of cobalt-methylaluminoxane catalyst in butadiene polymerization
Abstract Butadiene polymerization in aliphatic and aromatic solvents mediated by a preliminarily formed catalyst consisting of cobalt 2-ethylhexanoate, methylaluminoxane, and diene was studied. It was shown that the catalyst was active at a molar ratio of methylaluminoxane: cobalt: diene = 75−200:1:20, yielding high-molecular-mass polymers (intrinsic viscosity, 1.8–2.7 dl/g) containing at least 98% cis-1,4-units. Preliminary formation of the catalyst was found to increase its activity in butadiene polymerization at a low Al:Co ratio. In this case, the catalyst retains its high stereospecificity (the amount of cis-1,4-units in the polymer reaches 98% and more) independently of the nature of the solvent used for polymerization.
Activity and stereospecificity of cobalt-methylaluminoxane catalyst in butadiene polymerization
Glebova, N. N. (Autor:in) / Gavrilenko, I. F. (Autor:in) / Chausova, O. V. (Autor:in) / Sharaev, O. K. (Autor:in) / Yakovlev, V. A. (Autor:in)
Petroleum Chemistry ; 46 ; 274-275
01.07.2006
2 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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