Phase behavior of binary polymer blends with composition dependent χ

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Abstract
The introduction of a quadratic composition dependent χ into Flory–Huggins theory of binary blends is shown to create three new types of phase behavior in which two pairs of coexisting phases may be present in the two-phase region. This leads, for instance, to an unstable A-rich mixture separating into two A-rich phases instead of A- and B-rich phases.