Polyimide (PI) is a kind of polymer with a cyclic imide group in its molecular chain. It has the advantages of high-temperature resistance, low-temperature resistance, high strength, and high modulus, high creep resistance, high dimensional stability, low thermal expansion coefficient, high electrical insulation, low dielectric constant and low loss, radiation resistance and corrosion resistance. At the same time, it has the characteristics of low vacuum volatilization, less volatile condensate, and other space materials. It can be processed into polyimide film, high temperature engineering plastics, matrix materials for composite materials, high-temperature resistant adhesives, fiber and foam materials. In recent years, many countries are researching, developing, and utilizing polyimide, and polyimide is listed as one of the most promising engineering plastics in the 21st century. In view of its excellent performance, it is also known as the "problem-solving expert". It is generally believed that "without polyimide, there would be no microelectronic technology today". Polyimide products are mainly composed of thin films, coatings, fibers, engineering plastics, composite materials, adhesives, foam plastics, separation membranes, liquid crystal aligning agents, photoresists, and so on. They can be applied to aerospace, electrical insulation, liquid crystal display, automotive medical, atomic energy, satellites, a nuclear submarine, microelectronics, precision machinery packaging, etc. Among them, a polyimide film is an earliest and most mature product in the series of polyimide products. http://www.china-polyimide.com
