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Using extensive Monte Carlo simulations we study the phase diagram of asymmetric binary (AB) polymer blend confined into a thin film as a function ofthe film thickness D. The monomer-wall interactions are short ranged andantisymmetric, i.e, the left wall attracts the A-component of the mixture withthe same strength as the right wall the B-component, and give rise to a firstorder wetting transition in a semi-infinite geometry. The phase diagram and thecrossover between different critical behaviors is explored. For large filmthicknesses we find a first order interface localisation/delocalisationtransition and the phase diagram comprises two critical points, which are thefinite film width analogies of the prewetting critical point. Using finite sizescaling techniques we locate these critical points and present evidence of 2DIsing critical behavior. When we reduce the film width the two critical pointsapproach the symmetry axis $\phi=1/2$ of the phase diagram and for $D \approx 2R_g$ we encounter a tricritical point. For even smaller film thickness theinterface localisation/delocalisation transition is second order and we find asingle critical point at $\phi=1/2$.  Measuring the probability distribution of the interface position we determinethe effective interaction between the wall and the interface. This effectiveinterface potential depends on the lateral system size even away from thecritical points. Its system size dependence stems from the large but finitecorrelation length of capillary waves. This finding gives direct evidence for arenormalization of the interface potential by capillary waves in the frameworkof a microscopic model.Comment: Phys.Rev.

Interface localization-delocalization transition in a symmetric polymer blend: A finite-size scaling Monte Carlo study