Journal of Adhesion, Vol.63, No.1, 187-198, 1997
Surface hydrogen-bond components and linear solvation energy relationship parameters
In 1987, van Oss, Chaudhury and Good introduced the Lewis acid (or hydrogen-bond acidic) component, gamma(+), and Lewis base (or hydrogen-bond basic) component, gamma(-), and assumed the ratio of gamma(+) and gamma(-) 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 overestimated. Recently, we unexpectedly found a correlation between gamma(+) and gamma(-) and the linear solvation energy relationship (LSER) parameters alpha (hydrogen-bond-donating ability, HBD) and beta (hydrogen-bond-accepting ability, HBA), introduced by Taft and Kamlet in 1976. Interestingly, we found the ratio for the normalized alpha and beta 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 calculated total surface tensions for other liquids and polymers at 20 degrees C are generally unchanged, as expected, despite the favorable changes in the gamma(+) and gamma(-) ratio to make them less basic. In addition, the implications of other LSER parameters, e.g. Pi* and delta(H)(2) on surface properties will be briefly mentioned.