The Fourth Edition of the Handbook of Conducting Polymers, Two-Volume Set continues to be the definitive resource on the topic of conducting polymers. Volume 1, Conjugated Polymers: Perspective, Theory, and New Materials, features new chapters on the fundamental theory and new materials involved in conducting polymers. It discusses the history of physics and chemistry of these materials and the theory behind them. Finally, it details polymer and materials chemistry including such topics as conjugated block copolymers, metal-containing conjugated polymers, and continuous flow processing. Volume 2, Conjugated Polymers: Properties, Processing, and Applications, features new chapters focusing on these topics within conducting polymers. It discusses properties and characterization, including thermoelectric and mechanical properties, as well as processing and morphology, covering such topics as thermal phase behavior influence on optoelectronic properties, effect of miscibility on organic solar cells, and more. Finally, the book discusses applications, including the use of conducting polymers in stretchable electronics, electrochemical capacitors, and biomedical applications.