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Equilibrium structure of ternary blends of A and B homopolymers and symmetric AB block copolymer is investigated using an extended lattice self-consistent field theory by means of numerical calculations. We demonstrate that bicontinuous polymeric microemulsions result from microphase separation for relatively longer copolymer chain. Detailed free energy analysis revealed that the stability of the lamellar phase is marginal in the corresponding region. For relatively shorter copolymer chain, 3-phase coexistence between the lamellar, A -rich and B -rich phases is observed.
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Kodama et al. (2001) studied this question.
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