Polyimide (PEI) is a high-performance engineering plastic with many excellent properties. The following is a detailed answer:
1. High temperature resistance: The melting point of polyimide is very high, generally above 300℃, up to 400℃ ... which makes it possible to maintain stable physical and chemical properties in high temperature environment, such as being used as a thermal protection material in spacecraft. This also makes it widely used in automobiles and mechanical equipment, such as high-temperature engines, turbines and exhaust systems, because it can withstand high-temperature and high-pressure environments.
2. Chemical resistance: Polyimide material has excellent chemical resistance and can resist the corrosion of many chemicals, including acids, bases and solvents. This makes it widely used in the chemical industry to manufacture various chemical reactors, pipelines and valves. In addition, it can also be used in battery separators and chemical sensors.
3. Mechanical properties: polyimide material has high strength and rigidity, and also has good toughness and wear resistance. Its tensile strength can reach more than 150MPa, and its hardness can reach more than 90 Shore D. These characteristics make it used as high-strength structural parts and seals in automobile, aerospace and other fields. In addition, it can also be used to manufacture high-performance bearings, pumps and valves.
4. Electrical properties: Polyimide has good insulation and conductivity, and can be used to manufacture high-performance electronic devices and circuit boards. In addition, it has good radiation resistance and can be used in high-energy radiation environment.
5. Other characteristics: Polyimide also has some other special characteristics, such as low surface tension, good biocompatibility and processability. These characteristics make it widely used in manufacturing artificial joints, dental restoration materials and other medical fields.
To sum up, polyimide materials have excellent heat resistance, chemical resistance, mechanical properties, electrical properties and other special characteristics. These characteristics make it widely used in aerospace, automobile, mechanical equipment, chemical industry, electronics, medical treatment and other fields.