London Dispersive and Polar Surface Properties of Styrene–Divinylbenzene Copolymer Modified by 5-Hydroxy-6-Methyluracil using Inverse Gas Chromatography

The London dispersive and polar surface properties of solid materials are very important in many chemical processes, such as adsorption, coatings, catalysis, colloids, and mechanical engineering. One of materials such as styrene–divinylbenzene copolymer modified by 5-hydroxy-6-methyluracil at different percentages, was not deeply characterized in literature, and especially, it is very crucial to determine their London dispersive and polar properties. The new recent research in the inverse gas chromatography (IGC) technique allowed a full determination of the surface properties of styrene–divinylbenzene copolymer modified by 5-hydroxy-6-methyluracil by choosing well-known polar and non-polar organic solvents and varying the temperature. Applying the IGC technique at infinite dilution led to the retention volume of adsorbed molecules on styrene–divinylbenzene copolymer modified by 5-hydroxy-6-methyluracil at different percentages using the Hamieh thermal model and our new recent results on the separation of the two polar and the dispersive contribution of the free energy of interaction. The surface properties of these materials, such the surface free energy of adsorption, the polar acid and base surface energy, and the Lewis acid–base parameters were obtained as a function of temperature and for different percentages 5-hydroxy-6-methyluracil. The obtained results proved that the polar free energy of adsorption on styrene–divinylbenzene copolymer increased when the percentage of 5-hydroxy-6-methyluracil (HMU) increased. However, a decrease of the London dispersive surface energy of copolymer was observed for higher percentage of 5-hydroxy-6-methyluracil. A Lewis amphoteric character was shown for the copolymer with highest acidity, while the basicity linearly increased when the percentage HMU increased.