Polymeres are molecules which are constituted by a sequence of identical monomeres. The number of monomeres combined to form a polymere is principally unlimited. Polymeres are also designated macromolecules.

Polymeres can form a linear array but they also can include side links, ring structures or other two- or three-dimensional structures. They can be stretched or folded due to internal forces.

Organic polymeres are of particular relevance, i.e. molecules which can be composed by living organisms. Main elements are hydrogene supplied by water and carbon supplied by carbon dioxide from the atmosphere. Due to its 4 valence electrons the carbon atom can form a large variety of chemical bindings.

Polymerisation of Polyvinyl by composition of vinyl monomeres.