Gas-chromatographic study of the thermodynamic parameters of interaction between ethyl cellulose and low-molecular mass compounds

Thermodynamic parameters for the dissolution of dioxane, carbon tetrachlori de, acetone, ethyl acetate, dichloromethane, and ethanol in ethyl cellulose at temperatures above the glass transition point were determined by the me thod or reversed-phase gas chromatography. The exothermal character of diss olution, a wide range of variation of the increments of the thermodynamic p arameters of dissolution, and their dependence on the molar volume of sorba te are indicative of a highly ordered packing of polymer molecules and the possibility of sorption of the low-molecular-mass compounds in elements of the nonequilibrium free volume of ethyl cellulose. It i established that th e main contribution to the energy of sorbate dissolution in the polymer is due to the enthalpy factor.