What are the applications of polyimide

Due to the characteristics of polyimide in performance and synthetic chemistry, it is difficult to find a polymer that has such a wide range of applications as polyimide, and it shows extremely outstanding performance in every aspect.

1. Film: It is one of the earliest products of polyimide, used for slot insulation of motors and cable wrapping materials. Transparent polyimide film can be used as a soft solar cell base plate.

2. Coating: It is used as an insulating paint for electromagnetic wires, or as a high-temperature resistant coating.

3. Advanced composite materials: It is used in aerospace, aircraft and rocket components. It is one of the most high-temperature resistant structural materials. For example, the speed designed for the US supersonic passenger aircraft plan is 2.4M, the surface temperature during flight is 177℃, and the service life is required to be 60,000h. It is reported that 50% of the structural materials have been determined to be carbon fiber reinforced composite materials with thermoplastic polyimide as the matrix resin, and the amount used for each aircraft is about 30t.

4. Fiber: The elastic modulus is second only to carbon fiber, and it is used as a filter material for high-temperature media and radioactive substances and bulletproof and fireproof fabrics.

5. Foam plastics: It is used as a high-temperature resistant insulation material.

6. Engineering plastics: There are thermosetting and thermoplastic types. Thermoplastic types can be molded by compression molding, injection molding or transfer molding. They are mainly used for lubrication, sealing, insulation and structural materials. Guangcheng polyimide materials have begun to be used in mechanical parts such as compressor vanes, piston rings and special pump seals.

7. Adhesives: Used as high-temperature structural adhesives. Guangcheng polyimide adhesives have been produced as high-insulation potting materials for electronic components.

8. Separation membranes: Used for the separation of various gas pairs, such as hydrogen/nitrogen, nitrogen/oxygen, carbon dioxide/nitrogen or methane, and to remove moisture from hydrocarbon raw gas and alcohols in the air. It can also be used as a pervaporation membrane and ultrafiltration membrane. Due to the heat resistance and organic solvent resistance of polyimide, it is of particular importance in the separation of organic gases and liquids.

9. Photoresist: There are negative and positive photoresists, and the resolution can reach submicron level. It can be used in combination with pigments or dyes for color filter membranes, which can greatly simplify the processing process.

10. Application in microelectronic devices: used as dielectric layer for interlayer insulation, as buffer layer to reduce stress and improve yield rate. As protective layer, it can reduce the impact of environment on devices, and can also shield a-particles, reducing or eliminating soft errors of devices.

11. Orientation agent for liquid crystal display: polyimide plays a very important role in the orientation agent materials of TN-LCD, STN-LCD, TFT-LCD and future ferroelectric liquid crystal displays.