Monte Carlo simulations of random copolymers at a selective interface

We investigate numerically using the bond-fluctuation model the adsorption of a random AB copolymer at the interface between two solvents. From our results we infer several scaling relations: the radius of gyration of the copolymer in the direction perpendicular to the interface (R(gz)) scales with chi, the interfacial selectivity strength, as R(gz)=N(nu)f(root N chi) where nu is the usual Flory exponent and N is the copolymer's length; furthermore the monomer density at the interface scales as chi(2 nu) for Small chi. We also determine numerically the monomer densities in the two solvents and discuss their dependence on the distance from the interface.