Interpenetrating network polyimide is mainly aimed at improving the toughness of thermosetting polyimide issue undertaken. Since the thermosetting polyimide matrix advanced composites is the highest temperature polymer material. However, due to the high crosslinking density tend to make the material more brittle, so much attention been toughening its work.
Bismaleimide homopolymer too brittle, so much used copolymer to increase the toughness of the material. These copolymers are often due to the introduction of more fat cells. Affect the thermal stability of the polymer. An effective toughened bismaleimide resin method is linear heat-resistant polymer blends. That is, the formation of a semi-interpenetrating polymer networks. Such polymers can both increase the toughness of the material can also maintain thermal stability, particularly for engineering plastics is a good choice.