Evaluation of acrylic polymeric resin and small siloxane molecule for protecting cultural heritage monuments against sulfur dioxide corrosion

The experimental technique of reversed-flow version of inverse gas chromatography was applied in order to evaluate the ability of an acrylic copolymer, Paraloid B-72 and a small siloxane molecule, Silo 111 to protect cultural heritage monuments against corrosion caused by the SO2 dry deposition. Because these materials act as surface modifiers the calculation of the time distribution of various physicochemical parameters, such as adsorption energies, local adsorption isotherms, local adsorbed concentrations and free adsorbed energies are necessary for this evaluation. All the above quantities can be determined simultaneously not by computer simulation but directly from experimental data.The variation of the determined physicochemical parameters over time can lead to very important conclusions concerning either the physicochemical characterization of solid surfaces or the mechanism of the action of air pollutants on ancient structures, historic monuments and pottery.