EQUILIBRIUM-CONSTANTS AND THE PREDICTION OF PHASE-BEHAVIOR FOR PHENOXY BLENDS WITH ALIPHATIC POLYESTERS

An association model is applied to blends where one component contains secondary alkyl hydroxyl groups. The use of this model requires a knowledge of parameters (equilibrium constants) describing the self-association of the pure component, and the determination of these parameters from infrared studies of model compounds is described. Included is the complication that the self-associating species also contains ether groups, so that we can apply the model to the poly(hydroxy ether of Bisphenol A) (Phenoxy). Interassociation parameters describing the interaction between the Phenoxy hydroxyl and ester type carbonyl groups were obtained from infrared studies of miscible Phenoxy-poly(epsilon-caprolactone) blends. Using these parameters we have calculated a number of theoretical phase diagrams and miscibility windows for Phenoxy blends with aliphatic polyesters and polymethacrylates. The results are in very good agreement with experimental results reported in the literature.