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Thermodynamics of random copolymer mixtures

1987; Wiley; Volume: 188; Issue: 11 Linguagem: Inglês

10.1002/macp.1987.021881124

0025-116X

Constantinos G. Panayiotou,

Phase Equilibria and Thermodynamics

Abstract The lattice‐fluid theory of polymer solutions, previously applied to homopolymer‐solvent and homopolymer‐homopolymer mixtures, is now extended to random copolymer mixtures. A generalized, though simple, formalism is presented which is valid for binary copolymer mixtures, each copolymer having any number of different monomeric units (groups). Mixtures of a homopolymer with a random copolymer are treated as a special subcase. Particular emphasis is given to the phase stability of copolymer mixtures. Equations for the spinodal and the critical point are presented. The model is applied satisfactorily to various cases which attracted special attention in recent studies on the miscibility of copolymer mixtures.