Monomers are the building blocks of polymers. They can be subdivided into groups based on structure and functionality and include small-molecule and oligomeric compounds, as shown below. Major monomer categories include acrylics, alcohols, epoxides and amines. In addition to monomers, Sigma-Aldrich offers a large variety of end-functional polymers and crosslinkers that can be used as macro-monomers to create complex or cross-linked polymer architectures.