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

    Research output: Contribution to journalArticlepeer-review

    40 Citations (Scopus)


    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.

    Original languageEnglish
    Pages (from-to)5620-5627
    Number of pages8
    Issue number15
    Publication statusPublished - Aug 14 2018

    All Science Journal Classification (ASJC) codes

    • Organic Chemistry
    • Polymers and Plastics
    • Inorganic Chemistry
    • Materials Chemistry


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