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

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)2061-2068
Number of pages8
JournalMacromolecules
Volume50
Issue number5
DOIs
Publication statusPublished - Mar 14 2017

All Science Journal Classification (ASJC) codes

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

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