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以杨木粉、玉米淀粉和聚乳酸(PLA)为原料,甘油为相容剂,利用熔融挤出法制备了木粉-淀粉/PLA复合材料。研究了木粉含量对复合材料界面相容性、热性能、力学性能、流变性能以及吸水率的影响。结果表明:随着木粉含量的增加,PLA与木粉之间的界面相容性下降,木粉-淀粉/PLA复合材料的热稳定性下降,储能模量、损耗模量和复数黏度逐渐增加;随着木粉含量的增加,木粉-淀粉/PLA复合材料的拉伸强度和弯曲强度呈现先增大后减小的趋势,当木粉含量为18wt%时,复合材料的拉伸强度和弯曲强度均达到最大值,最大值分别为40.65 MPa和60.91 MPa;随木粉含量的增加,复合材料的断裂伸长率由9.64%减小到5.97%,而吸水率由5.38%增大到13.43%。
The wood flour - starch / PLA composites were prepared by melt extrusion with poplar wood flour, corn starch and polylactic acid (PLA) as raw materials and glycerol as compatibilizer. The effects of the content of wood flour on the interface compatibility, thermal properties, mechanical properties, rheological properties and water absorption of the composites were studied. The results showed that with the increase of wood flour content, the interfacial compatibility between PLA and wood flour decreased, the thermal stability of wood flour-starch / PLA composites decreased, the storage modulus, loss modulus and complex viscosity gradually decreased The tensile strength and flexural strength of wood flour-starch / PLA composites firstly increased and then decreased with the increase of wood flour content. When the wood flour content was 18wt%, the tensile strength And bending strength both reach the maximum, the maximum value is 40.65 MPa and 60.91 MPa, respectively. With the increase of wood flour content, the elongation at break of the composite decreases from 9.64% to 5.97%, while the water absorption increases from 5.38% 13.43%.