Abstract: Vinylons is a synthetic fiber that the aqueous solution of PVA condenses with formaldehyde by wet spinning. Its performance is excellent, especially the vinylons which is prepared by adding boron wet spinning. It has high strength (more than 7.0 cN (dtex)-1), high modulus and strong corrosion resistance. Flame retardant vinylons have both high modulus and flame retardant, which makes it widely used. Therefore the structures and properties of chloro-vinylons, CY841 flame retardant vinylon, high-strength bromine/antimony compound flame retardant vinylon and high-strength halogen-free flame retardant vinylon are introduced in detail. The advantages and disadvantages of the four kinds of fibers are compared through the X-ray diffraction (XRD), scanning electron microscopy (SEM), optical microscope, limit the oxygen index and other test methods. The development trends and application prospect of flame retardant vinylon are also discussed.

Key words: flame retardant , vinylon , chloro vinylon , CY841 flame retardant vinylon , high-strength bromine∕antimony composite flame retardant vinylon , high-strength halogen-free flame retardant vinylon