Monolayers of Diblock Copolymer at the Air-Water Interface: The Attractive Monomer-Surface Case
M. C. Fauré, P. Bassereau, M. A. Carignano, I. Szleifer, Y. Gallot, D. Andelman
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 shows that the adsorption energy per PEO monomer at the air-water interface is about one kB T. 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.
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