As long as ring formation, the thing which includ the ring and has a continuous carbon skeleton can be burn into carbon fiber.
Carbon fiber raw materials can be made into fibers and can recovery the carbon. The final products have good mechanical properties.
Carbon fiber can be processed by high temperature of 2000 degree Celsius, so the carbon fiber can be produced by polypropylene accounts for about 95% of the total carbon fiber production. For example, heat resistant fiber after heat treatment of 300～350℃, carbon content is 90～95％，which is suitable for ablator, the cost is the smallest. Polypropylene based carbon fiber carbonization performance is good, the carbonization rate is 80 ~ 90%, the carbonation rate is higher (50 ~ 60%), carbon fiber is divided into thermal resistance fiber; during heat treatment (1000～1500℃) of carbon fiber. Varieties of carbon and graphite fiber are developing. Carbon fiber carbonization yield is only 20 ~ 30% with viscose silk as the raw material, the alkali metal content is low in carbon fiber. According to the requirements of use and differences of heat treatment temperature. With the asphalt fiber as raw material, the carbon content is up to 99%. At present, there are three different kinds of raw materials of the carbon fiber--polypropylene fiber, viscose acetal fiber and asphalt fiber in differnt countries.
