Abstract
Abstract An adhesive bond is considered as a thermodynamic system in which the properties of components are expressed in relevant thermodynamic terms. Two hypotheses are analysed, (i) that the maximum strength of the bond is achieved when the interfacial energy is a minimum, and (ii) that only those systems which exhibit a true zero-interfacial energy can be considered stable in terms of their durability. Conditions are found expressed by the 'critical energy ratio', αCRIT, under which the thermodynamic work of adhesion becomes negative and, accordingly, the strength of the adhesive bond is zero. Thermodynamic Equilibrium Diagrams are constructed which allow analysis of bond performance in order to determine conditions for maximum strength, zero strength, and the ‘no-bond’ area, indicating zero-strength or spontaneous delamination tendency.
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