Influence of the polymerization conditions on the rigidity of phenylnorbornene-ethylene copolymers made using ethylene bis (indenyl) zirconium dichloride and MAO

Christer H. Bergström*, Paul G. Starck, Jukka Seppälä

*Corresponding author for this work

    Research output: Contribution to journalArticleScientificpeer-review

    18 Citations (Scopus)

    Abstract

    When characterized with DMA it was found that Phenylnorbornene-ethyl-ene copolymers with equivalent comonomer concentrations had very different storage moduli in the glassy state as well as glass transition temperatures. NMR analysis of the copolymers revealed that they had different ratios of Exo- and Endo-diastereomers even if the same comonomer composition had been used. The Exo/Endo-ratio in the polymer was surprisingly higher than in the monomer and increased with higher incorporations of the comonomer. Copolymers with higher Exo/Endo-ratios also had a tendency for lower storage moduli in the glassy state and higher tan 6 peaks. These properties are valuable because more flexible and impact-resistant copolymers are obtained.

    Original languageEnglish
    Pages (from-to)385-393
    Number of pages9
    JournalJournal of Applied Polymer Science
    Volume67
    Issue number3
    DOIs
    Publication statusPublished - 18 Jan 1998
    MoE publication typeA1 Journal article-refereed

    Keywords

    • Cyclic olefin copolymer
    • DMA
    • Metallocene catalyst
    • NMR
    • Phenylnorbornene

    Fingerprint

    Dive into the research topics of 'Influence of the polymerization conditions on the rigidity of phenylnorbornene-ethylene copolymers made using ethylene bis (indenyl) zirconium dichloride and MAO'. Together they form a unique fingerprint.

    Cite this