ABSTRACT
In polymer solubility studies, polar molecular interactions have been treated for a number of years as being comprehensible in the same terms, and with the same formalism, as apolar interactions. This is tacitly assumed in the Scatchard-Hildebrand theory (Hildebrand and Scott, 1950), and, for polymers, by Flory (1953) and Huggins (1941, 1942). [See also Prausnitz et al. (1986), Patterson (1969), Hansen (1967, 1969, 1970), Hansen and Beerbower (1971), and Barton (1983).] It also has been recognized for some time that, for polar polymers that form hydrogen bonds, accurate and quantitative predictions of solubility from the molecular properties are not easily achieved. There thus appears to be an advantage in treating the mechanism of solubility in apolar and polar systems separately.
