J. Phys. II France
Volume 5, Numéro 8, August 1995
Page(s) 1241 - 1253
DOI: 10.1051/jp2:1995179
J. Phys. II France 5 (1995) 1241-1253

Fluctuation Theory of Charged AB-Random Copolymers

Andrey V. Dobrynin

Department of Physics and Astronomy, University of Rochester, Rochester, New York 14627-0011, USA and Groupe de Physico-Chimie Théorique, E.S.P.C.I., 10 rue Vauquelin, 75231 Paris Cedex 05, France

(Received 11 November 1994, revised 1 April 1995, accepted 13 April 1995)

We study the behavior of symmetric AB random copolymer systems with equal numbers of positive and negative charges on the chains near the point of microphase separation. In the framework of the one-loop (Hartree) approximation the phase diagram of this class of copolymer system as function of the number of charged monomers is calculated. We find two different regimes in which microphase structure is stabilized by the long-range Coulomb interaction between charged groups or by the presence of the bonds between the A and B monomers that want to segregate into domains.

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