Abstract
Synopsis: Many network polymers, such as epoxy and urea resins, have been used as adhesives. In this review, physical chemistry of interface in adhesive bonding is introduced and the stability of interface is discussed from the view point of the interfacial free energy. In addition, it is reviewed that the chemical composition at the interface varies dynamically to minimize the free energy of interface and that the interfacial composition of adhesives can be controlled based on this principle.