Modified polyacrylonitrile-based carbon fiber as well as preparation method and application thereof

The invention discloses a modified polyacrylonitrile-based carbon fiber as well as a preparation method and application thereof. The method for preparing the modified polyacrylonitrile-based carbon fiber comprises the following steps: successively adding dicyandiamide and phosphoric acid into an acrylonitrile polymer solution to obtain a modified spinning solution; spinning the modified spinning solution to obtain a modified precursor; and carrying out heat treatment on the modified precursor in an inert atmosphere, and then carrying out air oxidation, low-temperature carbonization and high-temperature carbonization to obtain the modified polyacrylonitrile-based carbon fiber. According to the method for preparing the modified polyacrylonitrile-based carbon fiber, high-efficiency preparation is realized, and meanwhile, the carbon yield is increased. 本发明公开了一种改性的聚丙烯腈基碳纤维及其制备方法与应用。用于制备改性的聚丙烯腈基碳纤维的方法包括向丙烯腈聚合物的溶液中相继添加双氰胺和磷酸，得到改性的纺丝液；对所述改性的纺丝液进行纺丝得到改性的原丝；对所述改性的原丝进行惰性气氛下热处理，然后进行空气氧化、低温碳化、高温碳化获得改性的聚丙烯腈基碳纤维。用于制备改性的聚丙烯腈