MONTE-CARLO SIMULATIONS OF RANDOM COPOLYMERS AT A SELECTIVE INTERFACE

We investigate numerically using the bond-fluctuation model the adsorp tion of a random AB copolymer at the interface between two solvents. F rom our results we infer several scaling relations: the radius of gyra tion 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 m onomer densities in the two solvents and discuss their dependence on t he distance from the interface.