Abstract: Poly(lactic acid)/poly(butylene succinate) (PLA/PBS) and additives were melt blended in a vane extruder, the effect of composition and rotating speed on the mechanical properties was studied. With increasing PBS content, the tensile strength was little changed, while the impact strength increased significantly. When the rotating speed was 75 r/min, DCP content was 0.05 %, content of maleic anhydride grafted PP was 1.5 %, the mechanical properties was the optimal. SEM photographs showed that PLA was poorly compatible with PBS, however, the tensile force field provided by the vane extruder made the dispersed phase finer and more uniform.

Key words: vane extruder, poly(lactic acid), poly(butylene succinate), tensile deformation, mechanical property