拉伸形变作用下PLA/PBS增韧共混物力学性能研究

通过叶片挤出机对聚乳酸/聚丁二酸丁二醇酯（PLA/PBS）及添加剂进行塑化共混后制备复合增韧体系，研究不同PLA/PBS配比、挤出机转速以及添加剂种类对共混物力学性能的影响。结果表明，随着PBS含量的增加，PLA/PBS共混物的拉伸强度变化不大，而韧性明显提高；当叶片挤出机转速为75 r/min，改性剂邻苯二甲酸二仲辛酯(DCP)含量为0.05 %(质量分数，下同)，马来酸酐接枝聚丙烯（PP-g-MAH)含量为1.5 %时，共混物具有最佳力学性能；PLA与PBS相容性较差，但叶片挤出机提供的拉伸力场迫使分散相分散均匀，尺度较小。

Study on Mechanical Properties of PLA/PBS Toughening Blends Under Tensile Deformation

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.