▎ 摘　　要

NOVELTY - Graphene-polyacrylic acid composite conductive hydrogel is prepared by (a) dispersing graphene in distilled water and performing hydrothermal reaction to obtain graphene hydrogel, (b) adding distilled water solvent and graphene hydrogel, adding isoamyl nitrite and 4-aminobenzoic acid after dispersing, heating, and reacting to obtain carboxylated graphene hydrogel, (c) adding toluene solvent, carboxylated graphene, dicyclohexylcarbodiimide and 4-dimethylaminopyridine into the beaker, uniformly dispersing them, placing them in a heating reactor, heating, adding ethylenediamine, and reacting to obtain aminated graphene hydrogel, and (d) adding distilled water solvent and aminated graphene hydrogel to the beaker, adding acrylic acid after uniformly dispersing, in a nitrogen atmosphere, stirring, adding the initiator ammonium persulfate, reacting, adding ferric nitrate, and stirring to obtain a double-network crosslinked high-strength graphene-polyacrylic acid composite conductive hydrogel. USE - As graphene-polyacrylic acid composite conductive hydrogel. ADVANTAGE - The hydrogel has high strength. The chemical covalent crosslinking of graphene grafting and the ionic crosslinking of ferric ions enable the composite hydrogel to form a three-dimensional structure with a double network and interpenetrating, which significantly improves the tensile strength and elongation at break of the composite hydrogel. The hydrogel simultaneously utilizes graphene and ferric ions with excellent conductivity in the composite hydrogel matrix to form a three-dimensional conductive network, giving the hydrogel a new function of high conductivity. DETAILED DESCRIPTION - Graphene-polyacrylic acid composite conductive hydrogel is prepared by method involving (a) dispersing graphene in distilled water and placing it in a reaction kettle for hydrothermal reaction to obtain graphene hydrogel, (b) adding distilled water solvent and graphene hydrogel to the beaker, adding isoamyl nitrite and 4-aminobenzoic acid after uniform dispersion, placing in a heating reactor, heating to 70-90 degrees C, and reacting for 12-24 hours to obtain carboxylated graphene hydrogel, (c) adding toluene solvent, carboxylated graphene, dicyclohexylcarbodiimide and 4-dimethylaminopyridine into the beaker, uniformly dispersing them, placing them in a heating reactor, heating to 100-120 degrees C, adding ethylenediamine, and reacting for 6-12 hours to obtain aminated graphene hydrogel, and (d) adding distilled water solvent and aminated graphene hydrogel to the beaker, adding acrylic acid after uniformly dispersing, in a nitrogen atmosphere, stirring at 0-5 degrees C for 1-3 hours, adding the initiator ammonium persulfate, reacting for 24-48 hours, adding ferric nitrate, and stirring at a constant speed for 12-24 hours to obtain a double-network crosslinked high-strength graphene-polyacrylic acid composite conductive hydrogel.