▎ 摘　　要

NOVELTY - Preparing nanocellulose-graphene-polyvinyl alcohol-polyethylenediamine based conductive hydrogel, comprises e.g. (i) dissolving 2,2,6,6-tetramethylpiperidine-1-oxyl free radical and sodium bromide into de-ionized water, adding bleached wood pulp fibers, stirring and dispersing uniformly, (ii) adding sodium hypochlorite into cellulose solution obtained in the step (i) for oxidation reaction, adding sodium hydroxide solution to obtain oxidized cellulose, (iii) filtering oxidized cellulose, washing, ultrasonically dispersing to obtain slurry, preparing the cellulose suspension in a sealed container, stirring and refrigerating, (iv) taking cellulose suspension obtained in step (iii), adding graphene, uniformly stirring and ultrasonically dispersing to obtain stable cellulose-graphene composite suspension, (v) adding polyvinyl alcohol into water, heating at 70-80 degrees C, dissolving the polyvinyl alcohol by stirring, and then allowing to stand. USE - The conductive hydrogel is useful in the fields of optoelectronic devices, flexible wear-resistant devices and sensors. DETAILED DESCRIPTION - Preparing nanocellulose-graphene-polyvinyl alcohol-polyethylenediamine based conductive hydrogel, comprises (i) dissolving 0.016 g 2,2,6,6-tetramethylpiperidine-1-oxyl free radical and 0.08-0.12 g sodium bromide into 90-110 ml de-ionized water and adding 0.8-1.2 g bleached wood pulp fibers, stirring and dispersing uniformly, (ii) adding sodium hypochlorite into cellulose solution obtained in the step (i) for oxidation reaction, then continuously adding sodium hydroxide solution to controlling the pH of the reaction system at 9-11 to obtain oxidized cellulose, (iii) filtering the oxidized cellulose, washing, then ultrasonically dispersing to obtain slurry, preparing the cellulose suspension in a sealed container, stirring for 6-10 days, and then refrigerating, (iv) taking the cellulose suspension obtained in the step (iii), adding graphene fully and uniformly stirring, and ultrasonically dispersing uniformly to obtain stable cellulose-graphene composite suspension, (v) adding polyvinyl alcohol into water, heating at 70-80 degrees C, dissolving the polyvinyl alcohol by stirring, and then allowing to stand to completely dissolve the polyvinyl alcohol, (vi) adding polyethylene diamine into the polyvinyl alcohol solution obtained in step (v), stirring uniformly, and ultrasonically treating for 10-30 minutes to form uniform and stable mixed solution, then adding cellulose-graphene suspension obtained in step (iv) to the above-mentioned mixed solution and stirring for 30-50 minutes, and finally adding a crosslinking agent to continuously stirring to obtain a spinning solution, which is subjected to defoaming treatment for use, the mass ratio between polyvinyl alcohol and polyethylene diamine is 40:60-30:70, (vii) transferring the spinning solution obtained in the step (vi) into the injector, spinning using spinning device, coagulating the spinning solution into fibers in the coagulation bath, placing for 4-8 hours, taking out and air-drying naturally to obtain hydrogel fibers, (viii) placing hydrogel fiber at -80 to -60 degrees C and freezing for 3-5 hours, taking out, and thawing it at room temperature for 10-14 hours, then freezing at -80 to -60 degrees C for 3-5 hours, then thawing it, reciprocating three times to form physical cross-links in the microcrystalline area to obtain conductive hydrogel.