Owing to the facile, low cost, rapid, personalization characters, 3D printing method has been one of the most attractive additive manufacturing processes in medicine, airplane, packaging and printing areas. In this work, a series of carbon nanotubes/polylactic acid (CNTs/PLA) composites were prepared through the combination of molten co-extrusion and 3D printing processes. The orientation and dispersion of CNTs in PLA matrix were investigated to explore the impact of 3D printing process on the morphology of CNTs/PLA composites via transmission electron microscopy, field emission scanning electron microscopy and Raman spectroscopy. X-ray diffractometer, differential scanning calorimetry, and thermal gravity analysis were employed to study the crystal structure and thermal properties of the composites. In addition, the electrical conductivity of the prepared specimen revealed that the orientation of CNTs in PLA might enhance the conductivity of the composite. It was found that 3D printing process was beneficial to increasing the purity of CNTs, electrical conductivity and mechanical properties of CNTs/PLA composites.

由于其价格低廉，快速，个性化，3D打印方法已成为医药，飞机，包装和印刷领域最有吸引力的增材制造工艺之一。在这项工作中，通过熔融共挤出和3D打印工艺的组合，制备了一系列碳纳米管/聚乳酸（CNTs / PLA）复合材料。通过透射电子显微镜，场发射扫描电子显微镜和拉曼光谱研究了碳纳米管在聚乳酸基质中的取向和分散性，以探讨3D打印工艺对碳纳米管/聚乳酸复合材料形态的影响。用X射线衍射仪，差示扫描量热法和热重分析法研究了复合材料的晶体结构和热性能。此外，制备的样品的电导率表明CNT在PLA中的取向可能会增强复合材料的电导率。发现3D打印工艺有利于提高CNT的纯度，导电性和CNT / PLA复合材料的机械性能。