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This study constitutes a new development of surface thermodynamic methods to determine the London dispersive surface free energy component γ s d, the specific free energy of adsorption and the Lewis acid-base properties of polymers by using inverse gas chromatography (IGC) at infinite dilution. The net retention volumes Vn of n-alkanes and polar solvents adsorbed on a sodium carboxymethyl cellulose (Na-CMC) polymer surface were determined at four temperatures 313.15 K, 323.15 K, 333.15 and-343.15 K by IGC technique The London dispersive surface free energy component of Na-CMC was determined by using Dorris-Gray and Dorris-Gray-Hamieh methods, Van der Waals, Redlich-Kwong, Kiselev, geometric, cylindrical, spherical and Hamieh models. The more accurate value of γ s d of Na-CMC was obtained by Hamieh model taking into account the thermal effect on the surface areas of molecules: γ …