Hansen solubility parameters for polyethylene glycols by inverse gas chromatography

Inverse gas chromatography (IGC) has been applied to determine solubility parameter and its components for nonionic surfactants—polyethylene glycols (PEG) of different molecular weight. Flory–Huggins interaction parameter (χ) and solubility parameter (δ2) were calculated according to DiPaola-Baranyi and Guillet method from experimentally collected retention data for the series of carefully selected test solutes. The Hansen's three-dimensional solubility parameters concept was applied to determine components (δd, δp, δh) of corrected solubility parameter (δT). The molecular weight and temperature of measurement influence the solubility parameter data, estimated from the slope, intercept and total solubility parameter. The solubility parameters calculated from the intercept are lower than those calculated from the slope. Temperature and structural dependences of the entopic factor (χS) are presented and discussed.