J. Phys. II France
Volume 3, Number 3, March 1993
Page(s) 279 - 286
DOI: 10.1051/jp2:1993130
J. Phys. II France 3 (1993) 279-286

Interface between two incompatible polymers treated as a random potential problem

Christian Brosseau

Laboratoire de Spectrométrie Physique (CERMO), Université Fourier, B.P. 87, 38402 Saint-Martin-d'Hères Cedex, France

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

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.

64.75 - 68.90 - 82.90

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