Abstract
Adsorption isotherms of polystyrene from its solutions in tetrachloromethane and toluene on the hydroxylated, dehydroxylated, and silanized surfaces of nanoparticles of nonporous silica aerosil were measured. The adsorption equilibrium constants were calculated from the initial linear regions of the adsorption isotherms of polystyrene. The coefficients of distribution of polystyrene molecules between the surface and bulk phases and the changes in the free energy during the interaction between polystyrene macromolecules and hydroxylated, dehydroxylated, and silanized surfaces of aerosil nanoparticles were determined using the model of an adsorbed layer of constant thickness. The comparison of the experimental isotherms and the computed thermodynamic parameters of adsorption enabled revealing the effect of the surface state of aerosil nanoparticles and chemical nature of the solvent on the behavior of polystyrene macromolecules at the interface.
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