Interface between two incompatible polymers treated as a random potential problem

(Received 6 November 1992, accepted in final form 8 January 1993)

Abstract
A method based on a two-level system interacting with a bath is outlined to describe the interface between two immiscible polymers in a melt. This method is built upon the analogy existing between the configurations of a flexible chain and possible paths of a quantum-mechanical particle. In the limit of zero coupling to the bath (coherent regime), we refind the results of the Helfand-Tagami theory giving the size and the energy of the interface. As the coupling to the bath increases, the incoherent contribution dominates the interfacial properties. A polymer blend in a confined geometry illustrates also this method.