Glass Transition Behavior in Thin Polymer Films Covered with a Surface Crystalline Layer
Glass Transition Behavior in Thin Polymer Films Covered with a Surface Crystalline Layer
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表面结晶层覆盖的聚合物薄膜中的玻璃化转变行为
DOI：
10.1021/acs.macromol.6b02740
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发表时间：
2017-03
期刊：
影响因子：
5.5
通讯作者：
Wang Xinping
中科院分区：
文献类型：
--
作者：
Zuo Biao;Liu Yue;Liang Yongfeng;Kawaguchi Daisuke;Tanaka Keiji;Wang Xinping
在硅晶片上制备覆盖/不覆盖结晶表面层的非晶态聚对苯二甲酸乙二醇酯(PET)薄膜。在前一种情况和后一种情况下，薄膜的表面迁移率分别降低和增强。非晶PET薄膜的玻璃化转变温度（Tg）随着薄膜厚度的减小而降低，表现出显着的纳米限域效应。然而，一旦薄膜的表面区域结晶，或根据分段运动冻结，薄膜的 Tg 就会恢复到本体的 Tg。同时，表面结晶膜中分段运动的表观活化能也与体积值很好地一致。这些结果清楚地表明，表面区域的迁移率在薄膜的玻璃化转变中起着至关重要的作用。
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.
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