▎ 摘　　要

Graphene nanosheets have shown great application promise in promoting the mechanical performance and gas barrier properties for poly(lactic acid)(PLA),which was dwarfed by the relatively poor interfacial interactions. Using the microwave-assisted aqueous biomineralization approach,this work disclosed a high-efficiency and eco. friendly route to direct decoration of graphene nanosheets with well-crystallized and high-uniformity hydroxyapatite nanowhiskers,yielding the biomineralized graphene(BMGr) nanohybrids with favorable dispersibility and strong interfacial adhesion. The BMGr nanohybrids were homogeneously exfoliated and adhered onto the PLA microfibers, followed by the confined processing at 60 degrees C and 3 MPa for fabrication of strong and tough PLA composite films with extensive interfacial interactions. It is worth noting that the tensile strength,Young's modulus and tensile toughness of BMGr-reinforced PLA achieved 22.6 MPa, 199 MPa and 6.6 MJ/m(3),which were 6.46, 3.75 and 8.25 times of those of pure PLA,respectively. This work is of important significance for effective decoration and surface modification of 2D nanosheets,as well as industrially viable fabrication of mechanically robust biodegradable nanocomposites.