HYDROGEN-BONDING IN BLENDS OF PHENOXY RESIN AND POLY(VINYLPYRROLIDONE)

The equilibrium constants and enthalpies describing self-association a nd interassociation between functional groups in blends of poly(hydrox y ether of Bisphenol A) [phenoxy (PH)] and poly(vinylpyrrolidone) (PVP r) have been employed in an attempt to explain different experimental results of these blends. The methodology of an association model devel oped by Painter, Coleman, and their coworkers has been used. The simul ated glass transition temperatures and enthalpies of mixing agree with experimental results. The same set of association constants and entha lpies reproduces the free carbonyl fraction in a related mixture, epox y resin/poly(vinylpyrrolidone). Finally, the model gives a reasonable approach to the influence of the hydroxyl groups of phenoxy in its mis cibility with PVPr, when these hydroxyl groups are progressively elimi nated from the PH molecule by benzoylation.