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Glass transition in ultrathin polymer films: A thermal expansion study

M. Bhattacharya and M. K. Sanyal

Th. Geue and U. Pietsch

Surface Physics Division, Saha Institute of Nuclear Physics, 1/AF, Bidhannagar, Kolkata 700 064, India

Institut für Physik, Universität Potsdam, D-14469 Potsdam, Germany

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Phys. Rev. E 71, 041801 – Published 4 April, 2005

DOI: https://doi.org/10.1103/PhysRevE.71.041801

Abstract

The glass transition process gets affected in ultrathin films having thickness comparable to the size of the molecules. We observe systematic broadening of the glass transition temperature $(T_{g})$ as the thickness of an ultrathin polymer film reduces below the radius of gyration but the change in the average $T_{g}$ was found to be very small. The existence of reversible negative and positive thermal expansion below and above $T_{g}$ increased the sensitivity of our thickness measurements performed using energy-dispersive x-ray reflectivity. A simple model of the $T_{g}$ variation as a function of depth expected from sliding motion could explain the results.

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Glass transition in ultrathin polymer films: A thermal expansion study

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