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(Polyphenylene ether) is an amorphous material, and its working temperature is roughly ℃ to ℃. It has high impact toughness, low water absorption, high dimensional stability and is not prone to creep. Its electrical performance is basically not affected by the loading frequency, so it can be widely used in the electrical field. Main characteristics: The structure has a glass transition temperature of about ℃, a melting temperature of about ℃, and a density of .～.gcm. The molecular weight of practical polyphenylene ether is ~10,000, and the crystallinity is about %. The most outstanding advantage is its high water and steam resistance. There is no significant change in tensile and impact strength after being treated in a high-pressure steam container at ℃ It can reach ℃, which is equivalent to the level of general thermosetting plastics. Polyphenylene ether is produced by oxidative coupling polymerization of dimethylphenol in air or pure oxygen under the action of a copper salt (such as cuprous chloride) and an amine binding catalyst.
Advantages: good dimensional stability, low creep, heat resistance and no deformation, high impact toughness, low water absorption, good electrical properties in a wide frequency range, not easy to hydrolyze, easy to bond and very light weight.
Application fields: Polyphenylene ether is easy to process and mold, and can be extruded, injected and molded. Used in the manufacture of medical devices instead of stainless steel, able to withstand steam sterilization, and also used in mechanical and electronic parts, insulation materials, etc. Polyphenylene ether and polystyrene are blended and modified, and can be reinforced with %~% glass fiber, carbon fiber, etc. It is an engineering plastic and insulating material with excellent performance