ABSTRACT
According to acid-base theory, an important role in the formation of adhesion bonds are played by the interphase acid-base interactions between the adhesive and the substrate. Within this theory, the van Oss-ChaudhuryGood approach is most popular [1], in which characteristics of the acid and base interactions are nonadditive parameters γ+ and γ-of the surface free energy. Unfortunately, the values of γ+ and γ-of solids are impossible to determine if it is impossible to obtain the values of the corresponding parameters of test liquids from wettability data. The theory’s authors calculated that the surfaces of most polymers (polystyrene, poly(vinyl alcohol), poly(methyl methacrylate), cellulose nitrate) are mainly basic (this fact is referred to in the scientific literature as the “basic disaster”), which prompted to introduce the term “monopole surfaces” [1]. The surface is called monopole if it is either only basic (γ-= 0) or only acidic (γ+ = 0). The simplicity of calculating the acid and base parameters of liquids and solids within the said hypothesis has interested many researchers, and this method is now being used quite widely (see, e.g., [2, 3]). Typically used acidic and basic monopole surfaces are those of poly(vinyl chloride) [2] and poly(methyl methacry-late) [3], respectively. However, the γ+ and γvalues of test liquids that are determined by this method are often inconsistent with their chemical nature. There fore, the existence of monopole polymer surfaces requires detailed investigation. This is all the more so, as the Lewis and Bronsted theories say that there are no pure acids and pure bases and that any substance has both acid and base properties.
