【摘要】 以微晶纤维素（MCC）为增强材料、聚乳酸（PLA）为基体，通过高温熔融共混、挤出、拉丝等流程，制备适用于熔融沉积成型（FDM）3D打印技术的MCC/PLA复合材料，并通过FDM型3D打印机打印出成品。讨论了MCC添加量对该复合材料的力学性能、热性能、微观结构以及3D打印性能的影响。研究结果表明，随着MCC添加量的增加，复合材料的力学性能呈现先增高后下降的变化趋势，当MCC添加量为3%时，其拉伸强度和弯曲强度达到最高，分别为54.55 MPa和64.25 MPa。红外分析证实了微晶纤维素与聚乳酸在熔融时发生了接枝共聚反应。热性能分析表明，添加少量MCC，可以提高复合材料的热稳定性和PLA的结晶度。MCC添加量为3%的MCC/PLA复合材料其力学性能、打印性能和外观达到最佳，可应用于FDM型3D打印技术。更多还原

【Abstract】 Using microcrystalline cellulose(MCC) as reinforcing material, and polylactic acid(PLA) as matrix,MCC/PLA composites for fused deposition molding(FDM) 3D printing technology were prepared through high-temperature melt blending, extrusion and drawing processes, and the finished products were printed by FDM-type 3D printers. The effects of MCC content on the mechanical properties, thermal properties,microstructure and 3D printing performance of the composites were investigated. The research results show that the mechanical properties of the composites appear a trend of first increasing and then decreasing with MCC content. When MCC content is 3%, the bending strength and tensile strength of the composites reach 64.25 MPa and 54.55 MPa, respectively. FT-IR analysis confirmed that graft copolymerization reaction between microcrystalline cellulose and poly(lactic acid) occurred during melting. Thermal property analysis shows that the thermal stability of the composites and crystallinity of PLA can be improved by adding a small amount of MCC.The MCC/PLA composites with 3% MCC content have the best mechanical properties, printing performance and appearance, and can be applied to FDM 3D printing technology.更多还原