▎ 摘　　要

NOVELTY - Preparing high-strength and high toughness graphene composite fiber comprises (i) preparing 5-30 mg/ml graphene oxide dispersion; (ii) preparing 0.1-2 wt.% ultra-high molecular weight polyethylene oxide polymer solution; (iii) mixing the graphene oxide dispersion liquid obtained in the step (i) and the polyethylene oxide solution obtained in step (ii) to obtain composite spinning solution, where in the composite spinning solution, the mass ratio of the polyethylene oxide to graphene oxide is 1:10-10:1; (iv) extruding the composite spinning solution prepared in the step (iii) from spinning head, firstly entering the first stage coagulating liquid to generate primary fiber, entering nascent fiber into the second stage coagulating liquid, collecting wire on the reel, naturally drying to obtain the graphene oxide composite fiber, stretching the fibers in the first-stage condensing liquid and the second-stage condensing liquid. USE - The method is useful for preparing high-strength and high toughness graphene composite fiber used for energy storage, wear-resistant flexible device, biological material, sensor material and catalyst carrier. ADVANTAGE - The method improves the sheet orientation degree of the graphene in the fiber, introduces ultra-high molecular weight polymer long molecular chain to the graphene interlayer, uses the hydrogen bond between the single-layer graphene oxide layer and the long molecular chain, and uses the high entanglement density of the long molecular chain to realize double lifting of composite fiber strength and toughness, realizes free volume of the polymer is large, and enhances macromolecule segment activity ability. DESCRIPTION OF DRAWING(S) - The drawing shows scanning electric mirror image of the high-strength and high toughness graphene composite fiber.