Donor–Acceptor Electrochromic Conjugated Polymers with Different Structures
Conjugated polymers based on various electron–donor (D) and -acceptor (A) structures have been an important focus in the field of electrochromic (EC) research. Recent years have witnessed significant advances in the context of the design and synthesis of D–A conjugated polymers. Most studies have focused on the tuneable band gap and colour changes by introducing appropriate D and A units. However, D–A polymers with different configuration structures, such as specific D units containing A units in the backbone or side chain, novel D–A systems based on cruciform, star-shaped or dendritic monomers possess varied conjugation effects, electron affinities, ionization potentials and aggregated state structures as well as micro-morphologies, which leads to the diverse electrochemical, thermal and optoelectronic properties. In this chapter, our main focus will be placed on summarizing the characteristics of D–A conjugated polymers with various structures. The overarching aim is to strengthen the understanding of the relationship between different D–A structures and the EC properties, providing some suggestions for the design and preparation of novel D–A electrochromic conjugated polymers with desirable properties in the future.