Recent development of polyimides: Synthesis, processing, and application in gas separation

Abstract High‐performance polymers have been concomitant with advanced technology for half a century. With the advancement of synthetic chemistry, the recent development of high‐performance polymers has provided superior properties and enabled wide applications. This article reviews recent research progress in aromatic high‐performance polymers. Particularly, we focus on the synthesis and processing of polyimides, as well as the application in gas separation membranes. We begin with a brief introduction to highlight important history and physiochemical characteristics of polyimides. Then, we review the various synthesis methods, followed by recent advances for improving processability. Finally, we evaluate the use of high‐performance polymers in gas separation membranes with focus given to the key issues of plasticization and aging. Overall, the information presented herein provides an up‐to‐date overview of high‐performance polymers, polyimides particularly, and serves as a guide for further research involving the applications in membrane technologies.