Experimental understanding of the viscosity reduction ability of TLCPs with different PEs

Youhong Tang, Min Zuo, Ping Gao

    Research output: Contribution to journalArticlepeer-review

    2 Citations (Scopus)

    Abstract

    In this study, two thermotropic liquid crystalline polyesters (TLCPs) synthesized by polycondensation of phydroxybenzoic acid /hydroquinone/ poly dicarboxylic acid were used as viscosity reduction agents for polyethylene (PE). The TLCPs had different thermal, rheological and other physical properties that were quantitatively characterized. The two TLCPs were blended with high density PE (HDPE) and high molecular mass PE (HMMPE) by simple twin screw extrusion under the same weight ratio of 1.0 wt% and were each rheologically characterized at 190°C. The TLCPs acted as processing modifiers for the PEs and the bulk viscosity of the blends decreased dramatically. However, the viscosity reduction ability was not identical: one TLCP had obviously higher viscosity reduction ability on the HDPE, with a maximum viscosity reduction ratio of 68.1%, whereas the other TLCP had higher viscosity reduction ability on the HMMPE, with a maximum viscosity reduction ratio of 98.7%. Proposed explanations for these differences are evaluated.

    Original languageEnglish
    Pages (from-to)303-310
    Number of pages8
    JournalKOREA-AUSTRALIA RHEOLOGY JOURNAL
    Volume26
    Issue number3
    DOIs
    Publication statusPublished - 2014

    Keywords

    • Flexible spacer
    • Liquid crystalline polymer
    • Polymer melt
    • Rheological properties
    • Viscosity reduction

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