ABSTRACT
According to a common defi nition, pressure-sensitive adhesives (PSAs) can be adhered to various surfaces with light pressure within a few seconds. In certain cases, they also can be removed without leaving any residue or contaminating the substrate. Such behavior is due to their ambiguous, solid-like, as well as liquid-like behavior, that is, their viscoelasticity (see also Chapters 4 and 5). Th e former behavior (called cohesion) gives high strength in the debonding process, whereas the latter behavior (called adhesion) allows wetting of the surface during the bonding process.
