The products of random copolymerizations are heterogeneous in chemical composition, having a distribution of the fraction of each monomer in the copolymer. Polymer molecules with the same composition and molecular weight can be treated as separate components in a polymer blend. The spinodal limit is a simple function of chemical heterogeneity. The equilibrium number of phases, phase volumes, and average composition can be calculated from the condition that the chemical potential of a polymer species is equal in every phase. Phase diagrams are calculated for various hypothetical chemical distributions as well as a distribution characteristic of a random acrylonitrilebutadiene copolymerization to high conversion.
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Barry J. Bauer (1985) studied this question.
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