Effect of long-range forces on surface enrichment in polymer blends

Model calculations are made of surface segregation profiles for polymer and oligomer blends, both for the case in which surface segregation is driven purely by short-range forces, and for the case in which long-range (dispersion) forces are important. As expected, the inclusion of long-range forces affects the profiles as complete wetting is approached, but the effect on the shape of the surface segregation profile for a high polymer blend in the one phase region of the phase diagram is small; recent discrepancies between theory and experiment cannot be accounted for by this explanation.