Monolayers of diblock copolymer at the air-water interface: the attractive monomer-surface case |
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| Authors: | MC Fauré P Bassereau MA Carignano I Szleifer Y Gallot D Andelman |
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| Institution: | (1) Physico-chimie Curie (UMR 168 CNRS-Curie), Institut Curie, 11 rue Pierre et Marie Curie, 75231 Paris Cedex 05, France, FR;(2) Department of Chemistry, Purdue University, West Lafayette, IN 47907-1393, USA, US;(3) Institut C. Sadron, 6 rue Boussingault, 67083 Strasbourg Cedex, France, FR;(4) School of Physics and Astronomy, Raymond and Beverly Sackler Faculty of Exact Sciences, Tel Aviv University, Ramat Aviv 69978, Israel, IL |
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| Abstract: | We have studied both experimentally and theoretically the surface pressure isotherms of copolymers of polystyrene-polyethyleneoxide
(PS-PEO) at the air-water interface. The SCMF (single chain mean-field) theory provides a very good agreement with the experiments
for the entire range of surface densities and is consistent with the experiments if an adsorption energy per PEO monomer at
the air-water interface of about one kB T is taken. In addition, the chain density profile has been calculated for a variety of surface densities, from the dilute
to the very dense ones. The SCMF approach has been complemented by a mean-field approach in the low density regime, where
the PEO chains act as a two-dimensional layer. Both theoretical calculations agree with the experiments in this region.
Received: 19 June 1997 / Revised: 2 February 1998 / Accepted: 11 February 1998 |
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| Keywords: | PACS 82 65 Dp Thermodynamics of surfaces and interfaces |
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