The polymer used in making missiles, solid propellant, rocket motors etc. is

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. It is chemically modified to make the carbon fibers found in plenty of both high-tech and common daily applications such as civil and military aircraft primary and secondary structures, missiles, solid propellant, rocket motors, pressure vessels, fishing rods, tennis rackets, badminton rackets and high-tech bicycles.