What is the chemical composition of adhesives and adhesive tapes? The cohesion forces of an adhesive are based on molecular interactions between what are known as polymers. Polymers are large molecules (macromolecules) that are composed of many smaller molecules (monomers). "Poly" stands for "multiple", "mono" for "single". They are components of an adhesive.
Polymers in turn form long-drawn, moving chains of molecules. Above a certain length, these get tangled up in each other and produce the inner cohesion of the adhesive. Now it is time for your promised reward: if you look at these tangled-up chains of molecules under a microscope, the adhesive looks like a large pile of spaghetti.
Between the bonding points, these long chains of molecules are in motion. This lets the adhesive flow well over the surface and bond there. At the same time, it is possible to create other solid bonds between the chains by means of chemical processes. We call this "reacting" or "polymerization". By this the adhesive properties can be adjusted and precisely controlled. That's how it is with adhesive – a mixture that is worth taking a deeper look at.