Abstract
Historically, mechanical interlocking, diffusion, adsorption and surface reaction, and electrostatic theories have been postulated to describe the mechanisms of adhesion. More recently, other theories have been put forward for the adhesive bonding mechanism. It is often difficult to fully ascribe adhesive bonding to an individual mechanism. A combination of different mechanisms is responsible for bonding within a given adhesive system. An understanding of these theories will be helpful to those who plan to work with most aspects of adhesion. The microscopic parameter of interest in mechanical interlocking is the contact surface of the adhesive and adherend. The specific surface area (e.g., surface area per unit weight) of the adherend is an example of one such measure. Surface roughness is the means by which interlocking is thought to work, detected by optical or electron microscopy. In an electrostatic mechanism, the surface charge is the macroscopic factor of interest. Diffusion and wettability involve, respectively, molecular and atomic scale interactions.
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