▎ 摘　　要

NOVELTY - The preparation of functionalized graphene-polyester composite fiber, involves (1) adding N,N-dimethylformamide, dimethylolpropionic acid and terephthalic acid to reaction bottle, introducing nitrogen and adding p-toluenesulfonic acid, heating, cooling, adding distilled water to precipitate, filtering and washing to obtain hyper-branched polyarylate with terminal hydroxyl, (2) adding graphene oxide to thionyl chloride, reacting to obtain acyl chloride graphene, adding acyl chloride graphene and hyper-branched polyarylate to N,N-dimethyl formamide solvent, ultrasonically dispersing, and adding catalyst triethylamine, heating and refluxing, cooling, adding distilled water, filtering, and washing to obtain hyper-branched polyarylate graft of graphene function, (3) adding functionalized graphene and polyethylene glycol terephthalate to double-screw extruder, melting, extruding, granulating and melt spinning to obtain composite primary fiber, carrying out heat traction and stretching. USE - Preparation of functionalized graphene-polyester composite fiber. ADVANTAGE - The molecular chain of hyperbranched polyarylate grafted on graphene surface contains aryl polyester structure, ensures compatibility with aryl ester group in polyethylene terephthalate, and is hyperbranched with hydroxyl group at end of polyarylate forming an intermolecular hydrogen bond with polyethylene terephthalate, so that the functionalized graphene has excellent interfacial force and compatibility with polyethylene terephthalate, and the hyperbranched polyarylate has unique three-dimensional branched network structure, forming organic-inorganic hybrid ions with graphene, the elongation at break and mechanical strength of polyester fibers are significantly improved, and the functionalized graphene forms physical cross-linking sites in polyester fibers, which hinders the segment movement of polyester molecular chains and improves polyester fibers, thermal decomposition temperature and thermal stability of fibers. DETAILED DESCRIPTION - The preparation of functionalized graphene-polyester composite fiber, involves (1) adding N,N-dimethylformamide, dimethylolpropionic acid and terephthalic acid to reaction bottle, introducing nitrogen and adding p-toluenesulfonic acid, heating at 120-140degreesC for 6-18 hours, reacting, placing in ice water bath for cooling, adding distilled water to precipitate, filtering, washing product using distilled water and ethanol, preparing hyper-branched polyarylate with terminal hydroxyl, (2) adding graphene oxide to thionyl chloride, reacting to obtain acyl chloride graphene, adding acyl chloride graphene and hyper-branched polyarylate to N,N-dimethyl formamide solvent, ultrasonically dispersing, and adding catalyst triethylamine, where the mass ratio of acyl chloride graphene, hyper-branched polyarylate, triethylamine is 100:250-400:60-120, heating and refluxing to react, after reaction, placing in ice water bath for cooling, adding distilled water to precipitate, filtering, washing the product using distilled water and ethanol to obtain hyper-branched polyarylate graft of graphene function, (3) adding functionalized graphene and polyethylene glycol terephthalate to double-screw extruder, melting, mixing, extruding and granulating and performing melt spinning to obtain composite primary fiber, carrying out heat traction and stretching.