▎ 摘　　要

NOVELTY - A high elastic temperature-sensitive variable resistance polyurethane fiber comprises polyurethane, modified reduced graphene oxide and isopropyl acrylamide. USE - High elastic temperature-sensitive variable resistance polyurethane fiber. ADVANTAGE - The polyurethane fiber has excellent spinning performance, air permeability, excellent electrical conductivity and variable electrical resistance, and uses polyurethane fiber having excellent wear resistance, strain sensing capability, temperature-sensitive variable resistance and flexibility, and high elasticity. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation of the polyurethane fiber, which involves ultrasonically dispersing graphene oxide in water to obtain graphene oxide binder, adding tris(hydroxymethyl)aminomethane to graphene oxide binder solution, reacting at room temperature for 10-14 hours, adding 2-bromo-2-methylpropionyl bromide to modify graphene oxide to halogen group which is reactive on the plane, grafting polyisopropylacrylamide onto graphene oxide using single electron transfer active radical polymerization to obtain modified graphene oxide with temperature sensitivity, drying, ultrasonically dispersing modified graphene oxide in water, adjusting the pH value to 8-10 using 2-4 wt% sodium carbonate solution, adding excess sodium borohydride solution, stirring at 55-65 degrees C for 20-30 hours, suction filtering when the solution is changed from yellowish brown to black, washing filter cake using deionized water and absolute ethanol, vacuum drying at 55-65 degrees C for 10-15 hours to obtain modified reduced graphene oxide, ultrasonically dispersing modified reduced graphene oxide in solvent at 40-50 degrees C for 20-40 minutes to obtain dispersion, immersing polyurethane fiber in dispersion liquid, forming pores due to the solvent action of the fiber, ultrasonically dispersing for 20-40 minutes, contacting modified reduced graphene oxide with fiber surface, entering the pore, forming a conductive network with polyurethane surface to obtain polyurethane conductive fiber, immersing polyurethane conductive fiber in deionized water to carry out solidification, closing the pores on the surface of the polyurethane conductive fiber, blocking the modified reduced graphene oxide on the surface of the fiber, and washing the residual dispersion and modified reduced graphene oxide which does not enter the surface of the fiber.