Polyimide has excellent resistance to high temperature

but poor fusion and processing properties limited its wide application. Thermoplastic polyimide synthesized by introducing flexible groups

by designing the molecular structure of isomerization and other methods will get improved processing properties

and it can be used for extrusion and injection molding processing directly. In this paper

the synthesis methods of thermoplastic polyimide resin and its monomer were summarized. Moreover preparation methods and performance properties of nylon

poly(ether ether ketone) and epoxy resin modified with polyimide were proposed. Furthermore

the future development of polyimide modified engineering plastics were prospected.