Abstract
A study of the compatibility and incompatibility of 31 combinations of solutions of pairs of polymers in various common solvents was undertaken. A new approach, which utilizes the sign of the combined Hamaker coefficients (A132), was used. In this approach, phase separation is predicted to occur ifA132 is negative, and mixing ifA132 is positive. The Hamaker coefficients were derived from interfacial free energies. Good agreement between theory and experiment was obtained for systems at low polymer concentrations and for values forA132 farther removed from 0 than ≈ ± 0.3 X 10−14 ergs. The concentration dependence of the phenomenon has been studied more closely with eight of these solutions of polymer pairs, and the influence of polymer concentration on the surface tension of the liquids has been elucidated.
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