Effect of the cocatalyst on the copolymerization of ethylene and propylene with high activity Ziegler-Natta catalyst

J. Koivumäki*, J. V. Seppälä, L. Kuutti

*Corresponding author for this work

    Research output: Contribution to journalArticleScientificpeer-review

    12 Citations (Scopus)

    Abstract

    Ethylene and propylene were copolymerized in n-heptane in the presence of high activity heterogeneous Ziegler-Natta catalyst to study the effect of the cocatalyst on the microstructure and molecular weight of the copolymer. Seven aluminium alkyls of structure Al((CH2)nCH3)3, where n = 0-3, 5, 7 or 11, and one of structure Al(C(CH3)3)3, were used as cocatalysts. The effect of the Al/Ti mole ratio was also studied. Modern molecular modelling techniques were used to calculate the volume of the cocatalyst and the electron density around aluminium. The size of the cocatalyst molecule was found to have a marked effect on the activity of the catalyst: the smaller the cocatalyst the higher the activity. Higher electron density around aluminium increased the randomness of the copolymer.

    Original languageEnglish
    Pages (from-to)185-191
    Number of pages7
    JournalPolymer Bulletin
    Volume29
    Issue number1
    DOIs
    Publication statusPublished - Aug 1992
    MoE publication typeA1 Journal article-refereed

    Keywords

    • catalysis
    • copolymerization

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