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Issue 25, 2013
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Immobilisation of homogeneous olefin polymerisation catalysts. Factors influencing activity and stability

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Abstract

The activity and stability of homogeneous olefin polymerisation catalysts, when immobilised on a support, are dependent on both chemical and physical effects. Chemical factors affecting catalyst activity include the ease of formation of the active species, which is strongly dependent on the transition metal. Catalyst productivity is dependent on the balance between activity and stability. Immobilisation can lead to a lower proportion of active species and therefore lower initial polymerisation activity, but nevertheless give higher polymer yields in cases where increased catalyst stability is obtained. Important physical factors are support porosity and the ability of a support to undergo progressive fragmentation during polymerisation, facilitating monomer diffusion through the growing catalyst/polymer particle. This article illustrates the importance of these factors in olefin polymerisation with both early- and late-transition metal catalysts, with particular reference to the use of silica and magnesium chloride supports as well as to effects of immobilisation on polymer structure and properties.

Graphical abstract: Immobilisation of homogeneous olefin polymerisation catalysts. Factors influencing activity and stability

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Publication details

The article was received on 27 Dec 2012, accepted on 25 Feb 2013 and first published on 25 Feb 2013


Article type: Perspective
DOI: 10.1039/C3DT33098B
Citation: Dalton Trans., 2013,42, 8979-8987
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    Immobilisation of homogeneous olefin polymerisation catalysts. Factors influencing activity and stability

    J. R. Severn and J. C. Chadwick, Dalton Trans., 2013, 42, 8979
    DOI: 10.1039/C3DT33098B

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