Polylactic acid (PLA) and organosolv lignin were mixed at different ratios and extruded to obtain PLA-lignin composite filaments. PLA was replaced with lignin up to 20 wt%. Two plasticizers (polyethylene glycol (PEG) 2000 and struktol TR451) were added in varying concentrations to enhance the properties of PLA_L20 (20% lignin in PLA) composite filaments. The effect of lignin in PLA, and PEG, and struktol in PLA_L20 composites was investigated via tensile test, differential scanning calorimetry, thermogravimetric analysis, scanning electron microscopy, Fourier transform infrared spectroscopy of the filaments, and dynamic mechanical analysis of 3D printed samples. A 2 wt% PEG was able to enhance both tensile stress and elongation at maximum load of PLA_L20 composite by 19% and 35%, respectively, whereas struktol TR451 was able to improve elongation at maximum load by 24%.

将聚乳酸（PLA）和有机溶剂木质素以不同比例混合并挤出以获得PLA-木质素复合长丝。PLA被木质素取代，含量最高为20 wt％。添加了不同浓度的两种增塑剂（聚乙二醇（PEG）2000和struktol TR451），以增强PLA_L20（PLA中20％木质素）复合长丝的性能。通过拉伸试验，差示扫描量热法，热重分析，扫描电子显微镜，细丝的傅立叶变换红外光谱以及3D打印样品的动态力学分析，研究了木质素在PLA和PEG中的含量以及Struktol在PLA_L20复合材料中的作用。2 wt％的PEG能够在PLA_L20复合材料的最大载荷下分别提高拉伸应力和伸长率19％和35％，