NUMERICAL-STUDIES OF PHASE-SEPARATION IN MODELS OF BINARY-ALLOYS AND POLYMER BLENDS

We review some recent results concerning numerical studies of the Cahn-Hilliard equation in three dimensions to describe the phase separation process in a mixture after a quench within the coexistence curve. We focus on the late time behavior for two experimentally relevant systems: Binary alloys and binary polymer blends. We find that, in both systems, dynamical scaling with a time dependent characteristic length R(t) holds at sufficiently late times and that the late-time behavior for R(t) can be described by a modified Lifschitz-Slyozov law: R(t) = c + dtn, where n = 1/3. For polymer mixtures, the independence of the growth law exponent n of the quench temperature is in contradiction with some recent experiments on polymer systems. © 1990 IOP Publishing Ltd.