Enhanced Thermal Stability of Polystyrene by Interfacial Noncovalent Interactions

Yongming Hong, Yawei Li, Fengliang Wang, Biao Zuo, Xinping Wang, Li Zhang, Daisuke Kawaguchi, Keiji Tanaka

    研究成果: Contribution to journalArticle査読

    24 被引用数 (Scopus)

    抄録

    The local conformation of polystyrene (PS) and deuterated PS at the interface with quartz substrates, which were covered with phenyl groups using phenyltrimethoxysilane (PTS) under various conditions, was examined by sum frequency generation spectroscopy. As evidenced by the red-shift of the wavenumber of the v2 vibration mode for phenyl groups, it was claimed that PTS phenyl groups standing vertically from the quartz surface induced the perpendicular orientation of PS phenyl rings by energetically favorable parallel-displaced π-π interactions at the interface. The local conformation of PS chains strongly anchored onto the substrate by the π-π interactions remained almost unchanged for 48 h even at a temperature 60 K higher than the bulk glass transition temperature. That is, the interfacial π-π interactions facilitated the adsorption of PS chains on the substrate to attain a large enthalpic gain, resulting in significantly slower dynamics of PS chains at the interface. Our results illustrate the importance of the interfacial noncovalent interactions in controlling the structure and dynamics of macromolecular chains at the interface as well as in the thin film geometry.

    本文言語英語
    ページ(範囲)5620-5627
    ページ数8
    ジャーナルMacromolecules
    51
    15
    DOI
    出版ステータス出版済み - 8 14 2018

    All Science Journal Classification (ASJC) codes

    • 有機化学
    • ポリマーおよびプラスチック
    • 無機化学
    • 材料化学

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