Formation of interfaces in incompatible polymer blends: A dynamical mean field study

The interdiffusion dynamics of a polymer interface towards its equilibrium profile is studied using a dynamical mean field method, in which the nonequ ilibrium chemical potentials are evaluated numerically using the full polym er mean field free energy. Our results demonstrated that the interfacial wi dth grows as t(1/4) at early times and saturates to the equilibrium thickne ss at long times, in agreement with previous, more approximate analysis bas ed on Cahn-Hilliard-type theories. Furthermore, we show that the dynamical exponent can only be obtained unequivocally via a scaling analysis. The int erdiffusion of a polymer interface in the single phase regime is also studi ed.