Chinese Journal of Polymer Science

, Volume 31, Issue 1, pp 12–20 | Cite as

Two-layer model description of polymer thin film dynamics

  • Dong-dong Peng
  • Ran-xing Nancy Li
  • Chi-hang Lam
  • Ophelia K. C. Tsui
Paper

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.

Keywords

Polymer films Glass transition Viscosity 

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Copyright information

© Chinese Chemical Society, Institute of Chemistry, Chinese Academy of Sciences and Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  • Dong-dong Peng
    • 1
  • Ran-xing Nancy Li
    • 1
  • Chi-hang Lam
    • 2
  • Ophelia K. C. Tsui
    • 1
  1. 1.Department of PhysicsBoston UniversityBostonUSA
  2. 2.Department of Applied PhysicsHong Kong Polytechnic UniversityHong KongChina

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