木粉含量对木粉/酯化淀粉/聚乳酸复合材料性能影响

The effect of wood contents on the properties of wood flour/esterified starch/PLA composites

以甘油为相容剂,利用木粉、马来酸酐酯化淀粉和聚乳酸(PLA)进行熔融挤出制备了木粉/酯化淀粉/聚乳酸复合材料。利用XRD和SEM对复合材料的结晶度和断面形貌进行分析表征,以研究木粉含量对复合材料界面相容性的影响;并对复合材料的热稳定性、力学性能、流变性能以及吸水率进行表征。实验结果表明,随着木粉含量的增加,复合材料的界面相容性下降,拉伸强度和弯曲强度增大,断裂伸长率下降,吸水率逐渐增大;TGA测试结果表明木粉的加入使材料的热稳定性下降;流变测试表明木粉用量的增加,使复合材料的储能模量、损耗模量和复数粘度逐渐增加。

In this work,wood flour/esterified starch/PLA composites were prepared by melt extrusion method with wood flour,maleic anhydride esterified starch and poly （lactic acid）as raw material,glycerol as compati-bilizer.In order to study the effect of wood contents on the interfacial compatibility,XRD and SEM were used to analysis the crystal degree and fracture morphology.Thermal stability,mechanical properties,rheological properties and water absorption rate of composites were also characterized.The results showed that with the in-creasing of wood contents,the interfacial compatibility of composites decreased obviously,tensile strength and bending strength increased,elongation at break reduced gradually,and the water absorption rate increased ob-servably.TGA curves indicated that with wood contents increased,the thermal stability reduced.The rheologi-cal properties were also influenced by wood contents of the composites,as the addition amounts of wood flour increased,the storage modulus and complex viscosity gradually increased.