Polyacrylonitrile, with the chemical formula (C3H3N) n, is a polymer compound obtained by free radical polymerization of the monomer acrylonitrile. The acrylonitrile units in the macromolecular chain are connected in a joint tail manner. Mainly used for producing polyacrylonitrile fibers (PAN), the strength is not high, and the wear resistance and fatigue resistance are also poor. The advantages of polyacrylonitrile fiber are good weather resistance and sun resistance, and it can maintain 77% of its original strength after being placed outdoors for 18 months. It is also resistant to chemical reagents, especially inorganic acids, bleaching powder, hydrogen peroxide, and general organic reagents.

Physical and chemical properties:

Melting point: 317 ° C

Density: 1.184 g/cm3

Appearance: White or slightly yellow opaque powder

Solubility: soluble in polar organic solvents such as dimethylformamide, dimethyl sulfoxide, sulfolane, and ethyl nitrate, as well as concentrated aqueous solutions of inorganic salts such as thiocyanate, perchlorate, zinc chloride, lithium bromide, and special solvents such as concentrated nitric acid.