Abstract
AbstractThe Flory Huggins methodology coupled to AET has been extended to ternary polymer systems, in particular to solvent (A)/polymer 1 (B)/polymer 2 (C) systems, with the two polymers displaying H‐bonding interactions. Because the H‐bonding can perturb the randomness of polymeric conformations, the change in Gibbs free energy of mixing, ΔG, should arise from changes in combinatorial entropy as well as in interaction energy. The combinatorial part of ΔG is evaluated through AET as a function of the association constant η between B and C components, the autoassociation constant σ between B components, and the independent number m of interaction sites of acceptor C. The enthalpic contribution is evaluated by introducing concentration independent interaction parameters, $g'_{ij}$, evaluated by subtracting from the functions gij(ϕ) the energetic contributions due to the H‐bonding specific interactions. Once the resulting ΔG equation is tested, values obtained for hypothetic systems with low, moderate and strong H‐bonding interactions are discussed.magnified image
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