Surface Hydrogen-Bond Components and Linear Solvation Energy Relationship Parameters

Abstract

In 1987, van Oss, Chaudhury and Good introduced the Lewis acid (or hydrogen-bond acidic) component, γ+, and Lewis base (or hydrogen-bond basic) component, γ−, and assumed the ratio of γ+ and γ− for water at 20°C to be 1.0. With that ratio, the base components, γ−, for other liquids and polymers appeared to be overestimated. Recently, we unexpectedly found a correlation between γ+ and γ− and the linear solvation energy relationship (LSER) parameters α (hydrogen-bond-donating ability, HBD) and β (hydrogen-bond-accepting ability, HBA), introduced by Taft and Kamlet in 1976. Interestingly, we found the ratio for the normalized α and β for water at ambient temperature to be 1.8 instead of 1.0. Based on this new ratio for the corresponding γ+ and γ−, the calculated total surface tensions for other liquids and polymers at 20°C are generally unchanged, as expected, despite the favorable changes in the γ+ and γ− ratio to make them less basic. In addition, the implications of other LSER parameters, e.g. ∏* and δ2 H on surface properties will be briefly mentioned.