Interfacial mobility of polymers on inorganic solids

Keiji Tanaka, Yohei Tateishi, Yohei Okada, Toshihiko Nagamura, Masao Doi, Hiroshi Morita

    Research output: Contribution to journalArticlepeer-review

    90 Citations (Scopus)

    Abstract

    The segmental mobility of a typical amorphous polymer, polystyrene, at the interfaces with solid substrates was noninvasively examined by fluorescence lifetime measurements using evanescent wave excitation in conjunction with coarse-grained molecular dynamics simulation. The glass transition temperature (Tg) was discernibly higher at the interface than in the internal bulk region. Measurements at different incident angles of excitation pulses revealed that Tg became higher closer to the interface. The gradient became more marked with an increasing difference in the free energy at the interface between the polymer and solid substrate. The Tg value at the interface decreased with decreasing molecular weight. However, the decrement for the interfacial Tg was not as much as that for the bulk Tg, due to the restriction of chain end portions by the substrate. Finally, it was observed that when a film became thinner than 50 nm, the depressed mobility at the interface coupled with the enhanced mobility induced by the presence of the surface. The experimental and simulation results were in good accord with each other.

    Original languageEnglish
    Pages (from-to)4571-4577
    Number of pages7
    JournalJournal of Physical Chemistry B
    Volume113
    Issue number14
    DOIs
    Publication statusPublished - Apr 9 2009

    All Science Journal Classification (ASJC) codes

    • Physical and Theoretical Chemistry
    • Surfaces, Coatings and Films
    • Materials Chemistry

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