Heterocyclic aramid nanofiber membrane and preparation method thereof

The invention relates to a heterocyclic aramid nanofiber membrane and a preparation method thereof, and the preparation method comprises the following steps: adding an aromatic heterocyclic diamine monomer containing benzimidazole or benzoxazole, an aromatic diamine monomer and an aromatic diacyl chloride monomer into a solvent for reaction to obtain a heterocyclic aramid solution; adding a micromolecular physical cross-linking agent into the heterocyclic aramid fiber solution, and uniformly mixing to obtain a spinning glue solution; performing an electrostatic spinning process on the spinning glue solution to obtain a primary heterocyclic aramid nanofiber membrane oriented along the rotation direction of a roller; the primary heterocyclic aramid nanofiber membrane is soaked in an alkaline solution and distilled water and then taken out, normal-pressure drying or freeze drying is carried out, annealing treatment is carried out, and the pure heterocyclic aramid nanofiber membrane is obtained. The high-performa