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Possible phase diagrams for reversibly interpenetrating polymer networks.

We present possible equilibrium phase diagrams on the temperature-concentration plane for binary interpenetrating polymer networks (IPN) in which network junctions are formed by reversible crosslinking. It is shown that, in most parts of the phase plane, the formed networks of both species are mutually exclusive so that the system demixes into small domains of heterophases, but that there is a small region just above the top of the miscibility gap in which a molecularly mixed IPN can stay in a stable phase. The condition for the existence of a stable IPN is examined. Competition between network formation and two-phase demixing is studied