▎ 摘　　要

NOVELTY - Preparing carboxylated graphene oxide surface grafted polylactic acid composite (I) comprises carboxylated graphene oxide (GO-COOH) (II) as raw material, grafting through Steglish improvement of esterification method on to polylactic acid (PLLA) (III) to obtain (I). USE - (I) are useful in biological medical field. ADVANTAGE - The method has graft rate of up to 99.13%, mild reaction conditions and low experiment cost, has no by-product reaction process and organic solvent residue, improves purity of polymer, and is easy to operate. DETAILED DESCRIPTION - Preparing carboxylated graphene oxide surface grafted polylactic acid composite of formula (I) comprises carboxylated graphene oxide(GO-COOH) of formula (II) as raw material, grafting through Steglish improvement of esterification method on to polylactic acid (PLLA) of formula (III) to obtain (I). m and l = not defined.