The "sliding graft copolymer" (SGC) was employed to toughen brittle polylactide (PLA) by melt blending. The SEM was characterized the phase structure of PLA/SGC blend. The toughening mechanism was investigated by the SEM photo of impact-fractured surface of PLA/SGC blend. The thermal properties and crystallization behavior of PLA/ SGC blend were investigated by DSC and XRD. It is found that the blends showed a typical "sea-island" morphology. The particle size is from 0. 8μm to 4. lμm. The elongation at break and notch impact strength has been increased 6 and 2 times respectively as compared to unmodified PLA
which indicating the toughening effect of SGC. The in vitro cytotoxicity tests showed that the cytotoxicity of PLA/SGC blends belonged to grade 1