J. Phys. IV France 10 (2000) Pr7-221-Pr7-226
Glass transition reductions in thin freely-standing polymer films : A scaling analysis of chain confinement effectsK. Dalnoki-Veress1, J.A. Forrest1, P.G. de Gennes2 and J.R. Dutcher3
1 Department of Physics and Astronomy, University of Sheffield, Sheffield S3 7RH, U.K.
2 Collège de France, 11 place M. Berthelot, 75231 Paris cedex 05, France
3 Department of Physics, University of Guelph, Guelph, Ontario, Canada N1G 2W1
In this paper we present a new analysis of data on the reduced glass transitions observed in thin freely-standing films. The empirical analysis presented is highly suggestive of the existence of a mechanism of mobility in thin freely-standing films that is inhibited in the bulk and distinct from the usual cooperative motion near the glass transition temperature Tg. A tentative mechanism for Tg reductions in thin freely-standing films is discussed.
© EDP Sciences 2000