Local elastic expansion model for viscous-flow activation energies of glass-forming molecular liquids

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    Abstract

    A model for the viscosity of glass-forming molecular liquids is proposed in which a "flow event" requires a local volume increase. The activation energy for a flow event is identified with the work done in shoving aside the surrounding liquid; this work is proportional to the high-frequency shear modulus, which increases as the temperature decreases. The model is confirmed by experiments on a number of molecular liquids.
    Original languageEnglish
    JournalPhysical Review B. Condensed Matter and Materials Physics
    Volume53
    Issue number5
    Pages (from-to)2171-2174
    ISSN1098-0121
    Publication statusPublished - 1996

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