Two-layer model description of polymer thin film dynamics

Dong Dong Peng, Ran Xing Nancy Li, Chi Hang Lam, Ophelia K.C. Tsui

Research output: Journal article publicationJournal articleAcademic researchpeer-review

8 Citations (Scopus)

Abstract

Experiments in the past two decades have shown that the glass transition temperature of polymer films can become noticeably different from that of the bulk when the film thickness is decreased below ca. 100 nm. It is broadly believed that these observations are caused by a nanometer interfacial layer with dynamics faster or slower than that of the bulk. In this paper, we examine how this idea may be realized by using a two-layer model assuming a hydrodynamic coupling between the interfacial layer and the remaining, bulk-like layer in the film. Illustrative examples will be given showing how the two-layer model is applied to the viscosity measurements of polystyrene and polymethylmethacrylate films supported by silicon oxide, where divergent thickness dependences are observed.
Original languageEnglish
Pages (from-to)12-20
Number of pages9
JournalChinese Journal of Polymer Science (English Edition)
Volume31
Issue number1
DOIs
Publication statusPublished - 1 Jan 2013

Keywords

  • Glass transition
  • Polymer films
  • Viscosity

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Polymers and Plastics
  • Organic Chemistry

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