COPOLYMERS IN ASYMMETRIC INTERFACE POTENTIALS - A MONTE-CARLO STUDY

We investigate using scaling methods and Monte Carlo simulations rando m AB-copolymers at the interface between two good solvents. The asymme try of the interface potential gives rise to an adsorption-desorption transition which shows for infinitely long chains a critical point. Fo r finite chains we analyze the crossover scaling behavior near this cr itical point. Two new interface exponents, namely the crossover expone nt phi and the interface order parameter exponent beta are proposed. S imulation results obtained using the bond fluctuation model agree well with the scaling predictions. From the simulation data we obtain as b est estimates phi=1.3+/-0.1 and beta=0.35+/-0.04. (C) 1996 American In stitute of Physics.