Examination of surfaces of solid polymers by inverse gas chromatography .2. Acid-base properties

This paper deals with acid-base properties of the series of analogous poly(dimethacrylates) differing only by the presence and type of a heteroatom in the ester group and, for comparison, two reference polymers. These properties were quantified by K-A and K-D parameters, reflecting the ability of the surface to electrophilic and nucleophilic interactions, respectively. The parameters were calculated using various reference states for Delta G(s) determination. It was found that the introduction of the sulfide, ether or amino functions into the polymer ester group causes both an increase in the nucleophilicity (K-D/K-A) and in the total ability of the surface to acid-base interactions (K-D + K-A). The greatest influence is exerted by the sulfide group. The increase in the K-D + K-A parameter is associated with the decrease in the dispersive parameter gamma(s)(d). The influence of the polymer annealing at 80 and 160 degrees C, both under helium and air, on the parameters determined is also discussed. Copyright (C) 1996 Elsevier Science Ltd.