▎ 摘　　要

NOVELTY - Preparing functionalized graphene grafted modified polylactic acid material comprises (i) adding polyethylene glycol, accelerator triethylamine and p-toluenesulfonyl chloride to the dichloromethane solvent, and reacting to prepare single-ended p-toluenesulfonyl polyethylene glycol; (ii) adding single-end p-toluenesulfonyl polyethylene glycol and sodium azide with a mass ratio of 100:2-4 to the acetonitrile solvent, placing it in a constant temperature reactor, heating to 80-100 degrees C, and reacting for 24-48 hours to obtain single-end azide polyethylene glycol; (iii) adding single-end azide polyethylene glycol with a mass ratio of 100:12-25 and catalyst triphenylphosphine to tetrahydrofuran solvent; (iv) adding carboxylated graphene to distilled water solvent in a nitrogen atmosphere, ultrasonically dispersing uniformly; (v) adding D,L-lactide and polyethylene glycol to covalently modify graphene in anhydrous toluene solvent, stirring uniformly, adding catalyst stannous octoate. USE - The method is useful for preparing functionalized graphene grafted modified polylactic acid material. ADVANTAGE - The material has interface compatibility, tensile strength and thermal stability. DETAILED DESCRIPTION - Preparing functionalized graphene grafted modified polylactic acid material comprises (i) adding polyethylene glycol, accelerator triethylamine and p-toluenesulfonyl chloride to the dichloromethane solvent, and reacting to prepare single-ended p-toluenesulfonyl polyethylene glycol; (ii) adding single-end p-toluenesulfonyl polyethylene glycol and sodium azide with a mass ratio of 100:2-4 to the acetonitrile solvent, placing it in a constant temperature reactor, heating to 80-100 degrees C, and reacting for 24-48 hours to obtain single-end azide polyethylene glycol; (iii) adding single-end azide polyethylene glycol with a mass ratio of 100:12-25 and catalyst triphenylphosphine to tetrahydrofuran solvent, and reacting for 36-72 hours at room temperature to prepare single-end amino polyethylene glycol; (iv) adding carboxylated graphene to distilled water solvent in a nitrogen atmosphere, ultrasonically dispersing uniformly, adding single-end amino polyethylene glycol, condensation agent 1-ethyl-(3-dimethylaminopropyl) carbonyl Diimine hydrochloride and accelerator N-hydroxysuccinimide, heating to 50-60 degrees C, reacting for 20-30 hours, filtering, washing and drying to prepare polyethylene glycol covalently modified graphene; (v) adding D,L-lactide and polyethylene glycol to covalently modify graphene in anhydrous toluene solvent, stirring uniformly, adding catalyst stannous octoate, heating to 110-130 degrees C, and reacting for 20-30 hours, vacuum distilling, washing and drying, where solid product is made into standard splines through a twin-screw extruder and an injection molding machine.