Polyacrylonitrile. English abbreviation PAN. It is obtained by radical polymerization of monomeric acrylonitrile. The acrylonitrile units in the macromolecular chain are connected in a linker-tail manner. The appearance is white powder, the density is 1.14~1.15g/cm, and it softens and decomposes when heated to 220~300 °C.
Polyacrylonitrile is mainly used in the manufacture of synthetic fibers such as acrylic fibers. A synthetic fiber imitation of a high molecular polymer copolymerized with 85% or more of acrylonitrile and other second and third monomers. The Chinese trade name of polyacrylonitrile fiber. Commonly known as artificial wool. DuPont Company successfully developed pure polyacrylonitrile fiber (trade name: Alon) in the 1940s. It has not been put into industrial production because of difficult dyeing and fibrillation. Later, on the basis of improving the imitation of the polymer and the dyeability of the fiber, the acrylic fiber was industrially produced. Each country has different trade names. For example, there are Aaron, Acliffen, Kleisson, Zefron in the United States, Coulter in the United Kingdom, and Mao Lilong, Kaisei Mian, Ikeslan, Bethel and so on. The density of acrylic fiber is generally 1.16 to 1.18 g/cm 3 and the standard moisture regain is 1.0% to 2.5%. The fiber is characterized by good bulkiness and warmth, soft handfeel, good weather resistance, mildew proof and anti-caries properties. Mainly used as man-made fiber, commonly known as artificial wool; made of wool, knitted fabrics (pure or blended with wool) and woven fabrics, especially suitable for interior decorative fabrics, such as curtains. In materials science, polyacrylonitrile is often used as a matrix to synthesize multi-space materials, such as PAN-based activated carbon.