The research aim of this work was to understand the effects of the soil burial of rice straw on the morphology and properties of 3D-printed rice straw powder (RSP)/polylactic acid (PLA) biocomposites. The rice straw buried in the soil for various days was grounded and sieved into powder at 120 mesh. The RSP was then mixed with PLA at a mass ratio of 15/100 and the mixture was extruded into filament, followed by a fused deposition modeling 3D printing process. The as-prepared products were characterized in terms of morphological, mechanical, thermal, and nonisothermal crystallization properties. The results show that cavities with large holes induced by fused deposition modeling exhibit on the cross section of RSP/PLA biocomposite. The longer the burial duration of rice straw, the more the cavities with large holes could be observed on the surface. Therefore, soil burial of rice straw improved the thermal stability of the biocomposites while depressing their mechanical properties due to the amplification of the cavities. The crystallinity of the biocomposites was maintained at a low level (<9%) before and after the soil burial process.

这项工作的研究目的是了解稻草掩埋对3D打印稻草粉（RSP）/聚乳酸（PLA）生物复合材料的形态和性能的影响。将埋在土壤中数天的稻草磨碎并筛分成120目粉末。然后将RSP与PLA以15/100的质量比混合，并将混合物挤出成长丝，然后进行熔融沉积建模3D打印过程。按照形态，机械，热和非等温结晶特性对所制备的产物进行表征。结果表明，由RSP / PLA生物复合材料的横截面呈现出由熔融沉积模型引起的大孔洞。稻草的埋葬时间越长，在表面上可以看到的洞越大的洞越多。因此，稻草的土壤掩埋改善了生物复合材料的热稳定性，同时由于空腔的增大而降低了它们的机械性能。在土壤掩埋之前和之后，生物复合材料的结晶度保持在较低水平（<9％）。