Extruded blends of a thermotropic liquid crystalline polymer with polyethylene terephthalate, polypropylene, and polyphenylene sulfide

Markku T. Heino*, Jukka V. Seppälä

*Corresponding author for this work

    Research output: Contribution to journalArticle

    73 Citations (Scopus)

    Abstract

    Structure-property relationships were investigated for blends of a polyester-type thermotropic liquid crystalline polymer (LCP) with polyethylene terephthalate (PET), polypropylene (PP), and polyphenylene sulfide (PPS). The polymers were melt blended in a twin-screw extruder and the blends were extruded to strands of different draw ratios. Tensile properties of the blends were determined as a function of LCP content and draw ratio and compared with the results of morphological and rheological analyses. In general, the strength and stiffness of the matrix polymers were improved with increasing LCP content and draw ratio. At a draw ratio of 11, the blends of PET/30 wt% LCP exhibited a tensile strength about three times and an elastic modulus nearly four times that of pure PET. All blends exhibited a skin/core morphology with thin fibrils in the skin region. The formation and the sizes of the fibril-like LCP domains in the matrices were found to depend on LCP content and the viscosity ratio of the blend components.

    Original languageEnglish
    Pages (from-to)2185-2195
    Number of pages11
    JournalJournal of Applied Polymer Science
    Volume44
    Issue number12
    DOIs
    Publication statusPublished - 1992
    MoE publication typeA1 Journal article-refereed

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