SURFACE HYDROGEN-BOND COMPONENTS AND LINEAR SOLVATION ENERGY RELATIONSHIP PARAMETERS

In 1987, van Oss, Chaudhury and Good introduced the Lewis acid (or hyd rogen-bond acidic) component, gamma(+), and Lewis base (or hydrogen-bo nd basic) component, gamma(-), and assumed the ratio of gamma(+) and g amma(-) for water at 20 degrees C to be 1.0. With that ratio, the base components, gamma(-), for other liquids and polymers appeared to be o verestimated. Recently, we unexpectedly found a correlation between ga mma(+) and gamma(-) and the linear solvation energy relationship (LSER ) parameters alpha (hydrogen-bond-donating ability, HBD) and beta (hyd rogen-bond-accepting ability, HBA), introduced by Taft and Kamlet in 1 976. Interestingly, we found the ratio for the normalized alpha and be ta for water at ambient temperature to be 1.8 instead of 1.0. Based on this new ratio for the corresponding gamma(+) and gamma(-), the calcu lated total surface tensions for other liquids and polymers at 20 degr ees C are generally unchanged, as expected, despite the favorable chan ges in the gamma(+) and gamma(-) ratio to make them less basic. In add ition, the implications of other LSER parameters, e.g. Pi and delta(H )(2) on surface properties will be briefly mentioned.