▎ 摘　　要

NOVELTY - Preparation of polylactic acid and graphene oxide composite material involves using graphene oxide (GO) and reduced graphene oxide films having great application prospects based on the special characteristics of graphene, L-lactic acid and graphene oxide nanosheets as raw materials to prepare polylactic acid composites by in-situ melt polycondensation, in which the weight-average molecular weight and number-average molecular weight of the composites also decrease, as the content of GO nanosheets increases, reducing portion of the graphene oxide to graphene in the process of melt polymerization from oligomers to high polymers, in which there is also a strong interaction between the GO and PLA interface, transforming some of the defective crystals into more stable crystals during the melting process, forming composites crystallize by GO nanosheets as a nucleating agent in the polymer at low temperature, in which the greater its content and the greater the crystallinity of the composite. USE - Preparation of polylactic acid and graphene oxide composite material. ADVANTAGE - The method is simple technique, low reaction temperature reaction time, and provides high yield of the product with high purity. DETAILED DESCRIPTION - Preparation of polylactic acid and graphene oxide composite material involves using graphene oxide (GO) and reduced graphene oxide films having great application prospects based on the special characteristics of graphene, L-lactic acid and graphene oxide nanosheets as raw materials to prepare polylactic acid composites by in-situ melt polycondensation, in which the weight-average molecular weight and number-average molecular weight of the composites also decrease, as the content of GO nanosheets increases, reducing portion of the graphene oxide to graphene in the process of melt polymerization from oligomers to high polymers, in which there is also a strong interaction between the GO and PLA interface, transforming some of the defective crystals into more stable crystals during the melting process, forming composites crystallize by GO nanosheets as a nucleating agent in the polymer at low temperature, in which the greater its content and the greater the crystallinity of the composite. The addition of GO nanosheets has no obvious effect on the chemical structure of PLA.