engleski

The ellipsoidal model of the solubility volume

Generally, the solubility of polymers in different solvents may be described by the so-called solubility volume in Hansen's three-dimensional solubility (parameter) space. The solubility volume is usually modeled by the sphere or, less commonly, by the inclined ellipsoid. In this paper, the ellipsoidal model is revised. The procedure for the calculation of model parameters is given in details for the first time. The procedure is illustrated by the prediction of solubility of polystyrene (PS), cellulose diacetate (CDA) and polymethylmethacrylate (PMMA) in various, single and mixed solvents. The results indicate that the ellipsoidal model has some advantages over the spherical model. The solubility of PS in various solvents is predicted in semi-quantitative manner by the ellipsoidal model. However, neither of the models is powerful enough to quantify the influence of the fine balance of proton-donor and proton-acceptor interactions on the solubility of polar, H-bonding polymers (CDA and PMMA) in solvents possessing similar properties.

three-dimensional (Hansen) solubility parameter; solubility volume; spherical model; ellipsoidal model

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