Abstract
By using the interaction parameters deduced from small-angle neutron and X-ray scattering, we have calculated, via mean-field theory, the coexistence curve of the semidilute solutions of polystyrene in cyclohexane. We obtain substantial agreement between the theoretical coexistence curve and the observed phase-separation points reported in the literature. General features of the temperature-concentration diagram of polymer solutions in the semidilute poor solvent regime are also discussed.
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