Abstract
This paper discusses the background of the Scheutjens-Fleer theory for chain molecules in a concentration gradient and gives a number of illustrative examples. The model is introduced starting from the adsorption of monomers and dimers at an interface. For chain molecules, all the possible conformations have to be taken into account. Any segment is assigned, in a mean field approximation, a weighting factor that depends on the local concentrations. Chain conformations are treated as step-weighted walks in a field that is determined by all other molecules. The model can be applied to a variety of situations. Several examples are given: adsorption of homodisperse and polydisperse polymers, interaction between polymer covered surfaces, terminally anchored polymer, polyelectrolye adsorption, surfactants at solid and liquid interfaces, and the structure of surfactant micelles.
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