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以聚乳酸(PLA)、杨木粉为原料,采用改进过磨头的双螺杆挤出机制备新型木塑3D打印材料PLA/木粉复合材料。利用SEM对新型木塑3D打印材料的断面形貌进行分析表征,利用DSC考察了新型木塑3D打印材料的非等温结晶行为,并利用莫志深方程对新型木塑3D打印材料的结晶动力学进行研究分析。结果表明:PLA/木粉复合材料内部存在大量空洞,而增韧剂POE的加入则会很好的改善这一缺陷,大幅度地减少空洞的数量;莫志深方程可以较好地分析新型木塑3D打印材料的非等温结晶动力学,木粉的加入能够起到一定的异相成核作用,提高了结晶温度,但降低了结晶速率;当木粉含量为20%时,PLA的结晶温度最高,结晶速率最快。
A novel wood-plastic 3D printing material, PLA / wood flour composite, was prepared by using polylactic acid (PLA) and poplar wood as raw material and a twin-screw extruder with improved grinding head. The morphologies of the new wood-plastic 3D printing materials were analyzed by SEM. The non-isothermal crystallization behavior of the new wood-plastic 3D printing materials was investigated by DSC. The crystallization kinetics of the new wood-plastic 3D printing materials Conduct research and analysis. The results show that there are a large number of cavities in the PLA / wood flour composites, and the toughening agent POE can improve this defect and greatly reduce the number of cavities. The non-isothermal crystallization kinetics of 3D printing material and the addition of wood powder can play a role of heterogeneous nucleation and increase the crystallization temperature but reduce the crystallization rate. When the content of wood flour is 20%, the crystallization temperature of PLA Highest, the fastest crystallization rate.