A PLA-based bagasse cellulose composite material with excellent performance and low cost was prepared. As one of the most commonly used thermoplastic materials in fused deposition modeling (FDM), PLA is currently the most widely used three-dimensional (3D) printing technology. It has the natural advantage of being biodegradable. However, due to its poor toughness, it cannot meet the requirements for 3D printing consumables in some areas. Therefore, polylactic acid (PLA) is used as the matrix, tert-butyl peroxybenzoate (TBPB) are used as the free radical initiator, and glycidyl methacrylate (GMA) is used as the reaction monomer to prepare the PLA-GMA graft product, which realizes the toughening of PLA, and the PLA/PLA-GMA/BC (bagasse cellulose) composite material is prepared by the physical blending method, which realizes the reinforcement of PLA; it was proved by fourier transform infrared spectroscopy (FTIR) and ¹H NMR that GMA was successfully grafted onto the PLA molecular chain, and the influence of the grafting rate on the toughness of PLA-GMA was explored. It was concluded that the grafting rate of PLA-GMA with the best toughness was 10.33%. The strength is 15.94 MPa, the modulus of elasticity is 969.01 MPa, and the elongation at break is 278.17%, which is about 44 times the elongation at break of pure PLA. The PLA/PLA-GMA/BC composite material with high cellulose loading was prepared by physical blending. The effect of PLA-GMA content, BC particle size and BC content on the properties of composite materials was explored. The results showed that PLA-GMA when the addition amount is 25%, the capacity enhancement effect is the best; when the additional amount of BC is as high as 40%, the PLA/PLA-GMA/BC composite still has good mechanical properties, and the addition of BC can promote the crystallization of PLA; DSC results show that BC can promote the crystallization of PLA, and the addition of PLA-GMA is not conducive to the composite material the formation of PLA crystalline regions; the temperature at the maximum decomposition rate of 40% BCB/25% PLA-GMA/PLA composite material is 355.44 ℃, and the thermal stability is improved. This study proves that the functional group properties of GMA realize the toughening and enhanced dual modification of polylactic acid, which expands the choice and application range of FDM 3D printing materials.

制备了一种性能优良、成本低廉的PLA基甘蔗渣纤维素复合材料。作为熔融沉积成型（FDM）中最常用的热塑性材料之一，PLA是目前应用最广泛的三维（3D）打印技术。它具有可生物降解的天然优势。但由于其韧性较差，在某些领域不能满足3D打印耗材的要求。因此，以聚乳酸（PLA）为基体，过苯甲酸叔丁酯（TBPB）为自由基引发剂，甲基丙烯酸缩水甘油酯（GMA）为反应单体制备PLA-GMA接枝产物，实现了PLA的增韧，通过物理共混的方法制备了PLA/PLA-GMA/BC（甘蔗渣纤维素）复合材料，实现了PLA的增强；¹H NMR表明GMA成功接枝到PLA分子链上，并探讨了接枝速率对PLA-GMA韧性的影响。得出韧性最好的PLA-GMA的接枝率为10.33%。强度15.94 MPa，弹性模量969.01 MPa，断裂伸长率为278.17%，约为纯PLA断裂伸长率的44倍。通过物理共混制备了具有高纤维素负载量的PLA/PLA-GMA/BC复合材料。探讨了PLA-GMA含量、BC粒径和BC含量对复合材料性能的影响。结果表明，PLA-GMA添加量为25%时，容量增强效果最好；当BC的添加量高达40%时，PLA/PLA-GMA/BC复合材料仍具有良好的力学性能，BC的加入可以促进PLA的结晶；DSC结果表明BC可以促进PLA的结晶，PLA-GMA的加入不利于复合材料PLA结晶区的形成；40%BCB/25%PLA-GMA/PLA复合材料最大分解温度为355.44℃，热稳定性提高。本研究证明GMA的官能团特性实现了聚乳酸的增韧和增强双重改性，扩大了FDM 3D打印材料的选择和应用范围。40%BCB/25%PLA-GMA/PLA复合材料最大分解温度为355.44℃，热稳定性提高。本研究证明GMA的官能团特性实现了聚乳酸的增韧和增强双重改性，扩大了FDM 3D打印材料的选择和应用范围。40%BCB/25%PLA-GMA/PLA复合材料最大分解温度为355.44℃，热稳定性提高。本研究证明GMA的官能团特性实现了聚乳酸的增韧和增强双重改性，扩大了FDM 3D打印材料的选择和应用范围。