Abstract
Neutron reflectivity has been used to characterize the concentration profile of a linear flexible polymer adsorbed from good solvent at the liquid/air interface. Different models are considered in the interpretation of the reflectivity data. It is found that using the self-similar profile predicted by the scaling theory, the results obtained are consistent with those of surface tension measurements. The concentration profile obtained can be described as follows: in close proximity to the surface, there exists a monomer-rich zone, D, which is determined to be 10–15 Å thick and is independent of polymer molecular weight and of bulk concentration. Beyond D, the profile decreases with a self-similar structure with the manomer density scaling as φ( z) ∼ z − 4 3
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