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Polyacrylonitrile (PAN) is a resinous, fibrous, or rubbery organic polymer. Almost all polyacrylonitrile resins are copolymers made from mixtures of monomers; with acrylonitrile as the main component. PAN fibers are the chemical precursor of high-quality carbon fiber. It is chemically modified to make the carbon fibers found in tennis rackets & high-tech bicycles.