Length scale of mechanical heterogeneity in a glassy polymer determined by atomic force microscopy

Dong Wang, Yanhui Liu, Toshio Nishi, Ken Nakajima

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    15 Citations (Scopus)

    Abstract

    Using dynamic force microscopy, nanoscale mechanical heterogeneity in glassy polymer was characterized. The correlation length of heterogeneous viscoelasticity was measured to be ∼2.1 nm, consistent with the length scale of cooperatively rearranging regions at glass transition and is independent of molecular weight. Apparent energy dissipation with the variation of ∼57, originating from non-uniform distribution of local viscoelasticity, was revealed. The results provide definite experimental evidences on the nanoscale heterogeneity in glassy polymers and bear important insights in understanding the puzzling glass transition.

    Original languageEnglish
    Article number251905
    JournalApplied Physics Letters
    Volume100
    Issue number25
    DOIs
    Publication statusPublished - 2012 Jun 18

    ASJC Scopus subject areas

    • Physics and Astronomy (miscellaneous)

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