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5, suggests that as long as the contact angle is finite, these two requirements are consistent with one another, and the ample database assembled by Mittal 1311, Semi-empirical strategies for predictitig adhesion 31 showing the positive correlation between practical adhesion and ( 1 + cos@)in a variety of different systems appears to bear this out. This may, however, reflect nothing more than an increase in the fractional area of intimate contact between the phases occasioned by better wetting, as suggested by the classical experiment of Sharpe and Schonhorn cited earlier .
Most ‘polar’ materials have both an acid and a base character, as shown in Table 2. They include water, alcohols, amides, carboxylic acids and many more, and as liquids, are self-associated. e. exclusively acids (such as chloroform) or exclusively bases (such as most ketones). Thus whenever a monofunctional or bifunctional adhesive interacts with a solid with bifunctional groups, or vice versa, there will be an acid-base interaction. Materials capable of entering acid-base interactions are often thought of as ‘polar’ (even though their dipole moments may be nil), and it is easy to see the origin of the fortuitous success of the Owens-Wendt-Kaelble approach.
30. This so-called ‘polarity matching’ condition is consistent with ‘de Bruynes’ rule’, which states that optimum adhesives for non-polar materials are non-polar and for polar materials are polar 1801. e. given values of y i and y:, by using a pair of probe liquids, each with known y t and y: values. These are widely tabulated or may be determined from interfacial tension measurements against apolar liquids [Ill]. The work of adhesion values of these probe liquids against the solid are measured from their contact angles against the solid and their surface tensions: providing two equations in the two unknowns y: and y:.