J. Phys. II France
Volume 3, Numéro 10, October 1993
Page(s) 1485 - 1496
DOI: 10.1051/jp2:1993215
J. Phys. II France 3 (1993) 1485-1496

Static wetting behaviour of diblock copolymers

D. Ausserre, V. A. Raghunathan and M. Maaloum

Equipe de Physique de l'Etat Condensé. C.N.R.S. U.R.A. 807, Université du Maine, B.P. 535, 72017 Le Mans Cedex, France

(Received 23 February 1993, revised and accepted 16 July 1993)

Thin liquid films of ordered diblock copolymers deposited on a solid substrate form a multilayer stacking parallel to the solid surface. A multilayer with a finite extend can be stable, metastable, or unstable, depending on the relative values of the surface energies of the various interfaces. The spreading parameter and chemical potential of a n-layer are derived, and used for classifying all possible situations. It is shown that only mono- and bilayers can be stable, and that non-wetting multilayers are subjected to a long-time piling up instability, leading in practice to the formation of characteristic ziggourat-like structures.

68.10 - 68.15 - 61.30 - 61.25

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