Abstract
The surface characterization of poly (ethylene glycol) methyl ether (PEGME) was carried out using inverse gas chromatography (IGC) in the temperature range 393.15 to 443.15 K. The thermodynamic parameters, the dispersive component of the surface energy, , and the acid-base character of the surface of the PEGME were estimated using the retention time of different nonpolar and polar probes at infinite dilution. The specific free energy of adsorption, ΔG a , the specific enthalpy of adsorption, ΔH a , and the specific entropy of adsorption, ΔS a , of polar probes on polymer were determined. The values of ΔH a were correlated with both the donor and the modified acceptor numbers of the probes to quantify the acidic Ka and the basic Kb parameters of the PEGME surface. The values obtained for the Ka and Kb parameters indicate that the PEGME surface has basic character.
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