PEEK refers to a linear polymer compound composed of an aryl group, a ketone group and an ether bond. It is the main type of polyaryl ether ketone. The outstanding performance of PEEK is heat resistance, and the high continuous use temperature can reach 240. Above °C, it can be more than 300 °C after being reinforced with glass fiber. Secondly, it has excellent mechanical properties, electrical insulation properties, chemical medium corrosion resistance, water resistance and water vapor resistance, flame retardancy and radiation resistance. It is a new type of heat resistant polymer with excellent comprehensive performance
PEEK is a linear polymer compound composed of a benzene ring, an ether bond and a ketone group. The molecular bond contains a large amount of a benzene ring. The benzophenone formed by two benzene rings and a ketone group and a benzene ring constitute a macromolecular chain. The rigid structure, while the ether bond provides the flexibility of macromolecules, so the molecular chain of PEEK exhibits both rigid and soft characteristics. Compared with polyphenylene ether, the phenylene group attached to the ether bond in PEEK has no substituent, so its macromolecular chain is more flexible than polyphenylene ether, and its Tg (143 ° C) is lower than that of polyphenylene ether. Tg (210 ° C). Because of its regular molecular chain and a certain flexibility, it can be crystallized, with a large crystallinity of 48% and a general crystallinity of 35%.
The carbonyl group in the molecular chain of PEEK has a high polarity, the molecular force is higher than that of polyphenylene ether, and it can be crystallized, so the cohesive strength is high, resulting in higher mechanical properties than polyphenylene ether, and electrical insulation is slightly lower than polyphenylene ether. . Although the mechanical properties of PEEK will decrease significantly after exceeding Tg, the mechanical properties can maintain a high value even at temperatures above 200 °C due to the influence of crystallization.
