AbstractWe have used gas chromatography to study solvent interactions with polysulfone at temperatures below the glass transition. A previously published procedure has been employed to decompose the Gibbs energy of sorption of various solvents in polysulfone into its component contributions from dispersion forces, polar forces, and forces of specific interactions such as hydrogen bonding. The gas chromatographic results and the analysis of Gibbs energy of sorption has been used to establish general criteria for solubility of nonpolar, polar, and specifically interacting solvents in polysulfone.