Polymeric coatings have been extensively used in industrial fields because of their diverse and excellent characteristics. Adhesive properties are probably the most important characteristics of polymeric coatings. These properties are generally categorized into two configurations, namely cohesion and adhesion. When two contacting surfaces are the same, the force required to separate them is identified as cohesion. On the contrary, if two contacting surfaces are different, the separating force is referred to as adhesion. When polymeric coatings are formulated, it is essential to provide for acceptable adhesion features.
Adhesion, as a multi-disciplinary topic, is related to the interatomic and intermolecular interactions present at the interface of two surfaces.1 In polymeric coatings, the adhesion deals with several concepts such as thermodynamics, surface chemistry and physics, polymer chemistry and physics, rheology, and mechanical properties. Understanding the mechanism of adhesion is difficult because of the complexity of the subject.2, 3 In literature, surface morphology, surface wetting, mechanical interlocking, diffusion process, entanglement, acid-base interactions, electrostatic interactions and chemical bonding are among some of the most important parameters studied regarding the mechanisms of adhesion.4