Five high temperature resistant polymer materials

Heat-resistant polymers refer to polymer materials with good high-temperature stability and are widely used in aerospace, energy, electronics, building materials and other fields. In the fields of modern industry and science and technology, polymer materials are an indispensable material. With the development of science and technology, people have higher and higher requirements for polymer materials, and high-temperature stability is one of the important properties that polymer materials must possess. Heat-resistant polymer materials have good performance in high-temperature environments, such as high-temperature strength, high heat resistance, high oxidation stability, low creep, and good processing properties. Therefore, heat-resistant polymer materials are the mainstream materials to meet the needs of future high-temperature applications.

Aramid 1313 is a fiber with special functions, first developed by DuPont in the United States. This fiber looks similar to ordinary chemical fibers, but has many unique properties. The most outstanding feature is its excellent high temperature resistance, which can be used for a long time at high temperatures of 220°C without aging. At temperatures around 250°C, its dimensional stability is very good, with a thermal shrinkage rate of only 1%. The limiting oxygen index of aramid 1313 is greater than 28%. It is a flame-retardant fiber, does not support combustion, and has good self-extinguishing properties. It begins to decompose above 370°C, and carbonization begins around 400°C. Therefore, aramid 1313 is widely used in protective clothing, train protection, aviation and automotive industries and other fields to meet the needs for high performance, high durability and high temperature stability.

Compared with the existing methyl vinyl silicone rubber, phenyl silicone rubber has better temperature resistance. Its temperature resistance range can be extended to -70℃-350℃, and the short-term working temperature can reach -110℃. -400℃, also has the characteristics of ablation resistance and radiation resistance. Therefore, it is widely used in electric power, electronic appliances, automobiles, industrial deep refrigeration, aerospace, engines and other fields. Silicone rubber with a phenyl content of 5%-15% is called low phenyl silicone rubber; silicone rubber with a phenyl content of 15%-25% is called medium phenyl silicone rubber; and silicone rubber with a phenyl content of more than 30% is called high phenyl silicone rubber. Silicone Rubber. As the phenyl content increases, the molecular rigidity increases, and the radiation resistance and flame resistance also increase accordingly. However, medium and high phenyl silicone rubber are difficult to process and have poor physical and mechanical properties, so their production and application are subject to certain restrictions.

Borosilicone rubber is a special synthetic rubber with carbon decaborane segments in its silicone main chain. It can be used at high temperatures up to 410°C for short-term use, and the long-term use range is generally between -40°C and 350°C. It has other properties similar to silicone rubber. Borosilicon rubber can be processed and vulcanized like regular silicone rubber, and is often used to make products such as sealing parts and insulation materials that need to be used at high temperatures.

Polyimide is a polymer material with an imide structure in its main chain, and its molecular structure includes main structural units such as aromatic rings and heterocyclic rings. Polyimide has the highest flame retardant rating (UL-94), good electrical insulation properties, mechanical properties, chemical stability, aging resistance, radiation resistance and low dielectric loss. At the same time, these properties do not change significantly over a wide temperature range (-269℃-400℃). Therefore, polyimide is widely used in microelectronics, aerospace, automotive, medical, chemical and other fields.

Polysilazane polymer is a type of inorganic polymer material containing repeated Si-N in the molecular backbone. Due to the particularity of its chemical structure, it can be converted into silica ceramics under high temperature conditions. Therefore, polysilazane has important application value in high temperature resistance. Polysilazane resin has a small silicon-nitrogen bond angle and high molecular bond tension, so the molecular chain is not easy to form rings, and side reactions such as bite back and rearrangement are not easy to occur during the molecular polymerization reaction. It has good thermal stability. By changing the silicon atom Or nitrogen atom substituents can design polysilazane resins with specific properties, excellent high temperature resistance (1800°C), high film hardness, ultra-thin varnish, low viscosity; excellent adhesion to most types of substrates.

Heat-resistant polymer materials have good performance in high-temperature environments, including high-temperature strength, high heat resistance, high oxidation stability, low creep, and good processing properties. These heat-resistant polymer materials have great application prospects, and with continuous innovation and development, they provide solutions for future high-temperature application needs.