Influence of polymerization conditions on microstructure of norbornene-ethylene copolymers made using metallocene catalysts and MAO

Christer H. Bergström*, Taito L. J. Väänänen, Jukka V. Seppälä

*Corresponding author for this work

    Research output: Contribution to journalArticleScientificpeer-review

    37 Citations (Scopus)

    Abstract

    When characterized with 12C-NMR, it was found that norbornene-ethylene copolymers had a more complicated microstructure when dimethylsilyl bis(indenyl) zirconium dichloride was used as the catalyst compared to ethylene bis(indenyl) zirconium dichloride. One could see more block sequences but less alternating sequences. For both catalysts the highest amounts of block sequences were obtained for high norbornene concentrations, medium to high Al/Zr ratios, and low polymerization temperatures. There were also more alternating sequences for high norbornene concentrations and high polymerization temperatures. The isolated norbornene units (separated by more than one ethylene unit) were all exoconfiguration. No unsaturation was seen.

    Original languageEnglish
    Pages (from-to)1071-1076
    Number of pages6
    JournalJournal of Applied Polymer Science
    Volume63
    Issue number8
    DOIs
    Publication statusPublished - 22 Feb 1997
    MoE publication typeA1 Journal article-refereed

    Keywords

    • 13C-NMR
    • ethylene/norbornene copolymers
    • metallocene/MAO catalyst system
    • metallocenes

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