Polycyclic aromatic hydrocarbon-based carbon fiber and preparation method thereof

The invention relates to the technical field of carbon fibers, in particular to a polycyclic aromatic hydrocarbon-based carbon fiber and a preparation method thereof. The preparation method comprises the following steps: dissolving micromolecular polycyclic aromatic hydrocarbon in a solvent, uniformly stirring in an inert atmosphere, adding a catalyst for constant-temperature reaction, adding an alkylating agent for alkylation reaction, taking out a product after the reaction is finished, washing with water, and drying to obtain a polycyclic aromatic hydrocarbon compound precursor; carrying out hot-melt spinning on the polycyclic aromatic hydrocarbon compound precursor in an inert atmosphere to prepare polycyclic aromatic hydrocarbon compound fibers; carrying out non-melting oxidation treatment on the polycyclic aromatic hydrocarbon compound fibers to obtain non-melting fibers; the non-melting fibers are sequentially subjected to carbonization and graphitization treatment, and the polycyclic aromatic hydrocar