Observation of constraint surface dynamics of polystyrene thin films by functionalization of a silsesquioxane cage

Taiki Hoshino, Shiki Nojima, Masanao Sato, Tomoyasu Hirai, Yuji Higaki, So Fujinami, Daiki Murakami, Shigesaburo Ogawa, Hiroshi Jinnai, Atsushi Takahara, Masaki Takata

    Research output: Contribution to journalArticlepeer-review

    5 Citations (Scopus)

    Abstract

    The surface dynamics of polyhedral oligomeric silsesquioxane (POSS)-functionalized polystyrene (PS-POSS) thin films above the glass transition temperature were studied by grazing-incidence X-ray photon correlation spectroscopy in order to elucidate the effects of POSS at the end of the polystyrene chains. Much slower fluctuations were observed in the surface of PS-POSS thin films than in the polystyrene thin films, despite the negligible difference in their bulk viscosity. Quantitative analysis based on fluctuation-dissipation theorem indicated that there is a high-viscosity layer at the surface of the PS-POSS films, and that the substrate interface originated from POSS segregation.

    Original languageEnglish
    Pages (from-to)487-499
    Number of pages13
    JournalPolymer
    Volume105
    DOIs
    Publication statusPublished - 2016 Nov 22

    Keywords

    • Capillary wave
    • Polymer thin film
    • X-ray photon correlation spectroscopy

    ASJC Scopus subject areas

    • Organic Chemistry
    • Polymers and Plastics
    • Materials Chemistry

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