聚丁二酸丁二醇酯/聚乳酸交替多层复合材料的力学性能和降解行为

Mechanical Properties and Degradation Behaviors of Poly(Butylene Succinate)/Poly(Lactic Acid) Alternating Multilayered Materials

以聚丁二酸丁二醇酯(PBS)和聚乳酸(PLA)为原料,通过微纳多层共挤出技术制备了不同层数的PBS/PLA交替多层复合材料。采用偏光显微镜、差示扫描量热分析、力学测试和降解测试对比研究了交替多层复合材料和普通共混材料的力学性能及降解行为。研究表明:随着层数的增加,交替多层复合材料界面作用增强,在超过16层后材料的断裂伸长率高于普通共混材料,而屈服强度整体明显高于普通共混材料。在降解前期,交替多层复合材料的降解速率随层数的增加而降低;在降解后期,降解速率随层数的增加而增加,并在多于32层时降解速率保持相对稳定。交替多层复合材料的降解速率整体低于普通共混材料。

Poly( butylene succinate) /poly( lactic acid)( PBS /PLA) alternating multilayered materials were successfully prepared through multilayered co-extrusion technology. Mechanical properties and degradation behaviors of the alternating multilayered materials and the conventional blends were studied. The result showed that the elongation at break of the alternating multilayered materials increases with increasing the layer number and is higher than that of the conventional blends when the layer number is over 16 while the yield strength of the alternating multilayered materials is obviously higher than that of the conventional blends in spite of the layer number,since the interfacial strength of the alternating multilayered materials is enhanced with increasing the layer number. At the earlier stage of the degradation,the degradation rate of the alternating multilayered materials increases with decreasing the layer number; while at the later stage,the degradation rate increases with increasing the layer number and is kept at a stable level as the layer number reaches 32. The degradation rate of the alternating multilayered materials is slower than that of the conventional blends as a whole.