无卤阻燃聚丙烯腈纤维的制备及性能

In this paper, in order to improve the fire retardancy of polyacrylonitrile(PAN) fiber, the fire retardant PAN fiber was prepared by the reaction of hydrazine hydrate with PAN fiber. The structure of PAN fiber was characterized by Fourier transform infrared spectroscope (FTIR) and X-ray diffraction(XRD), the thermal property was studied by differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA), and the fire retardant and mechanical properties were studied by limited oxgen index(LOI) and tensile strength tester. The appearance of new C=N bond indicates that hydrazine hydrate really reacts with PAN fiber. The crystalline form of the modified PAN fiber changes and the crystallinity decreases accordingly. The temperature of cyclization exothermic decreases and the fire retardant and the char-forming ability increase. After modification, the mechanical property of PAN fiber drops a little, and with the modification time prolonging, the fire retardant performance of PAN fiber increases greatly.