▎ 摘　　要

We report the effect of filler modification on the properties of polylactide (PLA)-based nanocomposites, where graphene oxide (GO) nanosheets and polyhedral oligomeric silsesquioxane (POSS) nanocages are employed as nanofillers. The organically treated nanofillers are termed as GO-functionalized and POSS-functionalized. The synthesis of the nanocomposites was carried out via in situ ring-opening polymerization of lactic acid (LA). The following four naocomposite systems were prepared, characterized, and compared to achieve a better understanding of structure-property relationship (1) PLA/GO-functionalized, (2) PLA/POSS-functionalized, (3) PLA/physical mixture of GO-functionalized and POSS-functionalized, and (4) PLA/GO-graft-POSS (with eight hydroxyl groups). As revealed by the thermal and mechanical (nanoindendation) characterization, that the nanocomposites having a combination of GO and POSS as nanofiller, either as physical mixture of GO-functionalized and POSS-functionalized or as GO-graft-POSS, is far more superior as compared with the nanocomposites having individually dispersed nanofillers in the PLA matrix. Observed enhancement is attributing to the synergistic effect of the nanofillers as well as better dispersion of the modified-fillers in the matrix. POLYM. COMPOS., 35:118-126, 2014. (c) 2013 Society of Plastics Engineers