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The number of active centers and propagation rate constant in ethylene polymerization with a homogeneous catalyst based on cobalt 2,6-bis[imino]pyridyl complex with methylaluminoxane activator

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Abstract

The number of active centers C p and propagation rate constant k p upon ethylene polymerization with a homogeneous catalyst based on a cobalt complex with bis[imino]pyridyl ligands (LCoCl2, where L is 2,6-(2,6-(Me)2C6H3N=CMe)2C5H3N) using methylaluminoxane as an activator was determined by quenching by radioactive carbon monoxide (14CO). It was found that the drop in activity during polymerization on the above catalyst is due to the decreasing number of active centers (from 0.23 to 0.14 mol/mol Co within 15 min of polymerization); the propagation rate constant remained unchanged, 3.5 × 103 l/(mol s) at 35°C, which is substantially lower than for a catalyst based on an iron complex with analogous bis[imino]pyridyl ligands. It follows from the data on molecular mass characteristics of the produced polymer that the homogeneous catalyst LCoCl2/methylaluminoxane is of monocenter type, and the obtained value of the propagation rate constant reflects the true reactivity of its active centers.

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Authors and Affiliations

  1. Boreskov Institute of Catalysis, Siberian Branch, Russian Academy of Sciences, pr. Akademika Lavrent’eva 5, Novosibirsk, 630090, Russia

    A. A. Barabanov, N. V. Semikolenova, G. D. Bukatov, M. A. Mats’ko & V. A. Zakharov

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  1. A. A. Barabanov
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  2. N. V. Semikolenova
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  3. G. D. Bukatov
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  4. M. A. Mats’ko
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  5. V. A. Zakharov
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Correspondence to A. A. Barabanov.

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Original Russian Text © A.A. Barabanov, N.V. Semikolenova, G.D. Bukatov, M.A. Mats’ko, V.A. Zakharov, 2008, published in Vysokomolekulyarnye Soedineniya, Ser. B, 2008, Vol. 50, No. 11, pp. 2048–2052.

This work was supported by the Russian Foundation for Basic Research (project no. 07-03-00311).

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Barabanov, A.A., Semikolenova, N.V., Bukatov, G.D. et al. The number of active centers and propagation rate constant in ethylene polymerization with a homogeneous catalyst based on cobalt 2,6-bis[imino]pyridyl complex with methylaluminoxane activator. Polym. Sci. Ser. B 50, 326–329 (2008). https://doi.org/10.1134/S1560090408110067

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  • DOI: https://doi.org/10.1134/S1560090408110067

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