Adhesion is an essential characteristic of material behavior that influences the interactions between different substances in nature, and it is also important as this phenomenon is applied to the creation of man-made materials through applied adhesion, i.e. adhesive bonding.  Adhesive bonding is an important area of materials science focusing on the creation of joined substrates and composite materials. Because of the wide array of adhesive bonding situations, the concept of adhesion can be broadly applied across different material types and interactions. Mechanisms of adhesion fall into two broad areas: those that rely on mechanical interlocking or entanglement and those that rely on charge interactions. There are eight mechanisms of adhesion. These are: mechanical interlocking; electronic, electrical double layer or electrostatic theory; adsorption (thermodynamic) or wetting theory; diffusion theory; chemical (covalent) bonding theory; acid-base theory; theory of weak boundary layers, and the stickiness or tackiness that is a characteristic of elastomeric-based adhesives that contributes to the creation of an instantaneous adhesive bond. This presentation provides an overview of the current status of adhesion theories and mechanisms.

Theories and Mechanisms of Adhesion: Current Status

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ACS Fall 2022

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