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Molecular mobility in polymer thin films

Tseng1, Turro, Durning

  • 1Department of Chemical Engineering and Applied Chemistry, Columbia University, New York, New York 10027, USA.

Physical Review. E, Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics
|October 25, 2000
PubMed
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Thin polymer films exhibit significantly enhanced dye-probe diffusion above bulk values as thickness decreases. This study reveals reduced temperature dependence and altered glass transition properties in these nanoscale films.

Area of Science:

  • Materials Science
  • Polymer Physics
  • Surface Science

Background:

  • Understanding polymer behavior in thin films is crucial for advanced material applications.
  • Surface interactions significantly influence polymer dynamics at the nanoscale.
  • Previous studies indicate deviations from bulk properties in confined polymer systems.

Purpose of the Study:

  • To investigate the in-plane diffusion of dye probes in thin polystyrene films.
  • To determine the effects of film thickness and temperature on polymer diffusion.
  • To analyze changes in glass transition temperature and thermal expansion in confined films.

Main Methods:

  • Fluorescence Recovery After Photobleaching (FRAP) was employed to measure diffusion coefficients.
  • Experiments were conducted on monodisperse polystyrene films supported on fused quartz.

Related Experiment Videos

  • Film thicknesses ranged from approximately 4 to 100 times the polymer's radius of gyration (Rg).

    • Main Results:

    • In-plane dye-probe diffusion coefficients (D) increased significantly as film thickness decreased below 20Rg.
    • In the thinnest films (around 4Rg), diffusion was up to two orders of magnitude higher than bulk values.
    • The temperature dependence of diffusion weakened considerably in thinner films.
    • Free volume theory analysis suggested decreased apparent glass transition temperature (Tg) and liquid thermal expansion coefficient (αL) with reduced film thickness.

    Conclusions:

    • Confinement in thin polymer films drastically alters molecular mobility, enhancing diffusion.
    • Surface hydroxyl groups on the substrate likely play a role in modifying polymer-film interactions.
    • The observed changes in diffusion and thermal properties highlight the importance of surface and confinement effects in polymer thin films.