Polyacrylonitrile (PAN) is a resinous, fibrous, or rubbery organic polymer. Almost all polyacrylonitrile resins are copolymers made from mixtures of monomers; acrylonitrile is usually the main component. Pure PAN fibers are the chemical precursor of high-quality carbon fiber. Polyacrylonitrile is chemically modified to make acrylic fibres & carbon fibres found in tennis rackets & high-tech bicycles. A polymer is a generic term used to describe a substantially long molecule. ... Insect trapped in resin. ... A heteropolymer, also called a copolymer, is a polymer formed when two different types of monomer are linked in the same polymer chain. ... In chemistry, a monomer (from Greek mono one and meros part) is a small molecule that may become chemically bonded to other monomers to form a polymer. ... Acrylonitrile (CH2=CH-C≡N), is a pungent smelling, extremely flammable organic liquid. ... Carbon fiber composite is a strong, light and very expensive material. ...