▎ 摘　　要

NOVELTY - Preparing self-repairing hydrogel using modified graphene oxide material comprises e. g. (i) connecting the surface of graphene oxide with acrylic acid, dispersing the graphene oxide in a solution of acrylic acid, 4-dimethylaminopyridine, and N, N-dimethylformamide, where the mass ratio of the graphene oxide, acrylic acid, 4-dimethylaminopyridine and N, N-dimethylformamide is 20:1:10-20:800-1200, dissolving the dicyclohexyl carbodiimide in N, N-dimethylformamide solution and adding into the above solution within 10 minutes, where the mass ratio of the dicyclohexyl carbodiimide in N, N-dimethylformamide is 1:0-10, stirring for 24 hours, collecting the product graphene oxide-acrylic acid, and concentrating and freeze-drying at 15-35 degrees C for 24 hours; and (ii) dispersing the product graphene oxide-acrylic acid in distilled water with iron chloride in a beaker, mixing toluene and pyrrole in the beaker and emulsifying with a homogenizer until it does not separate. USE - The method is useful for preparing self-repairing hydrogel using modified graphene oxide material. ADVANTAGE - The hydrogel is tested for relative resistance change and conductivity under different strains and angles. DETAILED DESCRIPTION - Preparing self-repairing hydrogel using modified graphene oxide material comprises (i) connecting the surface of graphene oxide with acrylic acid, dispersing the graphene oxide in a solution of acrylic acid, 4-dimethylaminopyridine, and N, N-dimethylformamide, where the mass ratio of the graphene oxide, acrylic acid, 4-dimethylaminopyridine and N, N-dimethylformamide is 20:1:10-20:800-1200, dissolving the dicyclohexyl carbodiimide in N, N-dimethylformamide solution and adding into the above solution within 10 minutes, where the mass ratio of the dicyclohexyl carbodiimide in N, N-dimethylformamide is 1:0-10, stirring for 24 hours, collecting the product graphene oxide-acrylic acid, and concentrating and freeze-drying at 15-35 degrees C for 24 hours; (ii) dispersing the product graphene oxide-acrylic acid in distilled water with iron chloride in a beaker, mixing toluene and pyrrole in the beaker and emulsifying with a homogenizer until it does not separate, mechanically stirring for 10-60 minutes, at 300 revolutions/minute, reacting at 15-35 degrees C for 40-60 minutes, at 300 revolutions/minute, and obtaining Janus graphene oxide-acrylic acid, adding dopamine and tris-hydrochloric acid buffer (pH = 8.5) using a constant pressure dropping funnel, reacting until the system turns black to obtain uniform and stable Pickering emulsion, where the reaction temperature is 15-35 degrees C, for 2 hours, at PH 8.5, washing the emulsion with ethanol until the supernatant is clear to obtain black product Janus GOPP/y-PDA and freeze drying; and (iii) mixing the nano-sheet (Janus GOPPy/PDA) with acrylic acid, distilled water, potassium persulfate and iron chloride hexahydrate, reacting to obtain Janus nano-composite self-repairing hydrogel, where the mass ratio of the acrylic acid, distilled water, iron chloride hexahydrate, potassium persulfate and Janus GO-PPy/PDA is 1:1-10:0.1-10:1-10:1-10, reacting the reactive free radical initiator and potassium persulfate at 40-45 degrees C, applying the prepared Janus nano-composite self-repairing hydrogel into a flexible sensor to obtain rectangular hydrogel film (length 5-8 cm, width 3-4 cm, thickness 1-2 mm) template, preparing Janus self-healing hydrogel flexible sensor using electronic universal stretching machine (stretching speed: 25 mm/minute) and digital multi-meter, testing the hydrogel template for relative resistance change and conductivity under different strains and angles, studying the effect of the sensing signal on the response time of the sensor, applying 0.5% strain, at 500 mm/minute, maintaining the strain for 1 second, lowering its original position and applying to the hydrogel template at stretching rate of the same rate.