Abstract
In the first part of this contribution the Sanchez-Lacombe theory and the theory of Patterson were used to describe the phase behavior of various polymer blends. It turned out that the descriptions of the blends with respect to influence the free volume and enthalpy were surprisingly similar. Moreover, the PVT behavior of polymers is predicted similarly in both cases. In this paper the predictions of the two theories concerning excess volumes and influence of pressure on miscibility are investigated.
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