木纤维添加量对木纤维/聚乳酸复合材料性能影响OA北大核心CSTPCD

Poplar wood fiber/poly lactic acid(WF/PLA)composites were prepared by blending,melt extrusion,and injection molding process.The effects of different wood fiber content ratios-such as 1％,5％,10％,and 20％-on the properties of the composites were investigated.The research results indicated that as the wood fiber content increased,the interface compatibility between wood fiber and poly lactic acid becomes deteriorated.This led to a decrease in the hydrophobicity,tensile,and bending strength of the composites,while the tensile and bending moduli increased.When 1％wood fiber was added,the thermal stability of the composites was good,and the notch impact strength and elongation at break increased by 45.9％and 13.2％respectively,compared to neat poly lactic acid.The composting degradation experiment showed that the mass loss rate of the composites with 20％wood fiber reached 55.7％by the 8th month.Additionally,the weight average and number average molecular weight of the poly lactic acid matrix decreased to 80 and 40 kDa,respectively.This study provided a theoretical basis and technical support for optimizing the performance of poly lactic acid,which helps expand the application of natural plant fiber/poly lactic acid composites in packaging and agricultural industries.