J. Phys. II France
Volume 7, Numéro 3, March 1997
Page(s) 503 - 516
DOI: 10.1051/jp2:1997141
J. Phys. II France 7 (1997) 503-516

Phase Separation in Polymer Blends Near a Surface

A. Saout-Elhak1, M. Benhamou1 and M. Daoud2

1  Laboratoire de Physique des Polymères et Phénomènes Critiques, Faculté des Sciences Ben M'sick, B.P. 7955, Casablanca, Morocco
2  Laboratoire Léon Brillouin, C.E. Saclay, 91191 Gif sur Yvette Cedex, Fiance Groupe de Dynamique des Phases Condensées, Case 026, Université Montpellier 11, 34095 Montpellier Cedex 05, France

(Received 11 August 1995, revised 7 November 1996, accepted 3 December 1996)

We consider a blend of two polymers of different chemical nature in the presence of an adsorbing surface. We assume that the surface adsorbs strongly one or both species at high temperature. This constrains the system to a quenched composition on the surface. We assume that phase separation occurs at lower temperature. We discuss the influence of the quenched surface fluctuations on the critical properties of the mixture. We generalize to these mixtures the characteristic critical adsorption that is present in simple fluid mixtures. The composition profile is calculated in all cases.

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