Neutron reflectivity studies of polymers adsorbed on mica from solution

The conformation of a block copolymer (polystyrene-poly(2-vinylpyridine)) and a homopolysmer (polystyrene) adsorbed is investigated. The reflectivity profiles have been fitted to various theoretical models of the volume fraction profiles of the adsorbed layer.For the homopolymer system, the best fits were obtained with profiles having the form of an exponential decay, whereas for the block copolymer in toluene, profiles with a maximum or a parabolic shape gave the best fits