Glass Transition Behavior in Thin Polymer Films Covered with a Surface Crystalline Layer

Biao Zuo, Yue Liu, Yongfeng Liang, Daisuke Kawaguchi, Keiji Tanaka, Xinping Wang

    研究成果: Contribution to journalArticle査読

    26 被引用数 (Scopus)

    抄録

    Thin amorphous poly(ethylene terephthalate) (PET) films covered with/without a crystallized surface layer were prepared onto silicon wafers. In the former and latter cases, the surface mobility in the film was depressed and enhanced, respectively. The glass transition temperature (Tg) of the amorphous PET film decreased with the reduction of the film thickness, exhibiting a remarkable nanoconfinement effect. However, once the surface region of the thin film was crystallized, or frozen in terms of the segmental motion, Tg of the films recovered to that of the bulk. Concurrently, the apparent activation energy of the segmental motion in the surface-crystallized film was in good accordance with the bulk value as well. These results make it clear that the mobility in the surface region plays an essential role in the glass transition of the thin films.

    本文言語英語
    ページ(範囲)2061-2068
    ページ数8
    ジャーナルMacromolecules
    50
    5
    DOI
    出版ステータス出版済み - 3 14 2017

    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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