期刊
MACROMOLECULES
卷 50, 期 5, 页码 2061-2068出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.macromol.6b02740
关键词
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资金
- National Natural Science Foundation of China [21374104, 21504081, 21674100]
- Natural Science Foundation of Zhejiang Province [LQ16B040001]
- Young Researchers Foundation of Key Laboratory of Advanced Textile Materials and Manufacturing Technology
- Zhejiang Sci-Tech University [2015QN04]
- JSPS KAKENHI [15H02183]
- JST SENTANKEISOKU [13A0004]
- Grants-in-Aid for Scientific Research [26410224, 15H02183] Funding Source: KAKEN
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 (T-g) 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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