Effect of mixing time and catalyst addition on the compatibility of PET/LCP blends

Markku T. Heino*, Jukka Veli Seppälä

*Corresponding author for this work

    Research output: Contribution to journalArticleScientificpeer-review

    7 Citations (Scopus)

    Abstract

    Blends of PET wt 30 wt. % of two thermotropic LCPs were prepared in a mixing chamber. Catalyst addition and long mixing times were used to improve the compatibility of the blends via transesterification reactions. DSC showed a clear melting point depression for PET and SEM some small changes in morphology, and these were attributed to transesterification between LCO and PET. The reactions were confirmed by FTIR, which revealed some shifts and totally new ester peaks. The level of the storage modulus obtained from DMTA measurements showed that moderate mechanical reinforcement for PET was achieved, even after extremely long mixing periods at high temperatures. However, the effect of the possible transesterification reactions on the resultant blend properties was less than expected perhaps because the portion of the material reacting at the interfaces was small relative to the total blend.

    Original languageEnglish
    Pages (from-to)1-25
    Number of pages25
    JournalActa Polytechnica Scandinavica, Chemical Technology and Metallurgy Series
    Issue number214
    Publication statusPublished - 1993
    MoE publication typeA1 Journal article-refereed

    Keywords

    • compatibility
    • liquid crystalline polymer (LCP)
    • polymer blends

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