Distribution of segmental mobility in ultrathin polymer films

  • Rotella, Cinzia
  • Napolitano, Simone
  • De Cremer, Lieven
  • Koeckelberghs, Guy
  • Wübbenhorst, Michael
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Publication date
January 2010
Publisher
American Chemical Society (ACS)
Journal
Macromolecules

Abstract

We investigated by dielectric relaxation spectroscopy the distribution of glass transition temperatures and dielectric relaxation strength inside ultrathin polymer films capped between metallic layers. Measurements of the local dielectric properties were achieved by selectively placing layers of dye-labeled polystyrene at different depth inside films of neat polystyrene of different thickness. We show experimental evidence for an interfacial nature of the deviations from bulk behavior; in particular, the value of the dielectric strength and the glass transition temperature strongly depend on the distance from the solid interface. These peculiar profiles of static and dynamic dielectric properties are discussed in terms of a physical picture...

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