Polymers are the archetypal modern materials, used in every aspect of everyday life. This Primer gives a thorough introduction to Polymer Chemistry, ranging from a historical perspective, through the development of high-tonnage materials earlier in the twentieth century, to modern high-performance materials that have a range of useful additional properties. The authors have long experience in the teaching of polymer science to undergraduates, and also experience in the polymer industry. A feature of this Primer is a discussion of practical industrial aspects in the technology of these materials.