可生物降解PLA/St/BF复合材料的制备

摘要

The biodegradable polylactic acid(PLA)/starch(St)/bagasse fiber(BF)composites were prepared via extrusion and injection molding process with glycerin as plasticizer. The effect of raw material proportion on mechanical properties, water absorption, thermal stability and rheological properties of the composites were observed. Scanning electron microscope(SEM)was used to survey the section of the composites. The results show that the composites prepared with high mass fraction of St and BF keep mechanical properties at a certain extent and meet the requirements of processing. The mechanical properties of the composites can be improved by adding BF. The increase of St and BF content can improve the water absorption significantly and widen the interfacial gaps among different components of the composites.%以甘油为增塑剂,采用挤出注塑工艺制备了可生物降解聚乳酸(PLA)/淀粉(St)/蔗渣(BF)复合材料,研究了原料配比对复合材料力学性能、吸水性能、热稳定性及流变性能的影响,并利用扫描电子显微镜对复合材料断面进行了观察.结果表明:BF与St用量较大时,制备的PLA/St/BF复合材料仍能保持一定的力学性能,能满足实际加工要求;BF对PLA/St复合材料具有一定的增强作用;增大极性组分St和BF用量会大幅提高PLA/St/BF复合材料的吸水性,且组分间界面间隙变大.