| Abstract: | The adsorption of three acrylonitrile–butadiene random copolymers from two solvents has been studied: two pyrogenic silicas of differing surface areas, which had received several surface modifications, were used as adsorbents. Infrared spectroscopic studies confirm that the nitrile groups bond to the silica surface. The amount of copolymer adsorbed is related to the acrylonitrile content, which also controls the copolymer solubility: adsorptions are higher from benzene than from a better solvent, trichloroethylene. Vapor sorption of model compounds indicate how the adsorbent surface area and surface composition affect monolayer capacities: heats of adsorption are not markedly altered by the adsorbent modifications. |
