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1,3-benzoxazine has long been considered as the unique polymerizable benzoxazine species to fabricate high performance polymers. Herein, polymerization of 2H,4H-3,1-benzoxazine is observed for the first time and the thermal property...

Dielectric film capacitors for high‐temperature energy storage applications have shown great potential in modern electronic and electrical systems, such as aircraft, automotive, oil exploration industry, and so on, in which polymers are the preferred materials for dielectric capacitors. This review tries to summarize the recent progress in the field of energy storage based on heat‐resistant all‐organic polymers from the perspective of their operating temperatures. Based on this, a summary of commonly used and latest research on high‐temperature polymers is conducted, and they are classified into different heat‐resistant insulation grades, consequently providing a new perspective for high‐temperature polymers dielectric research, especially on the selection of them under different occasions. Emphasis is placed on the influencing factors of polymer performance and ways to develop high‐temperature polymers. Especially, properties under high temperature including dielectric constant and loss, glass transition temperature, and energy density are summarized, inspiring researchers devoting further efforts in this area. A future prospect in this field is also discussed.