Jiang Yangxiaozhe, Latif Muhammad, Kim Jaehwan
Creative Research Center for Nanocellulose Future Composites, Department of Mechanical Engineering, Inha University, 100, Inha-ro, Michuhol-gu, Incheon 22212, South Korea.
ACS Omega. 2024 May 1;9(22):23442-23450. doi: 10.1021/acsomega.3c10101. eCollection 2024 Jun 4.
Additive manufacturing of nanocellulose (NC) materials is an emergent technological domain that facilitates the fabrication of complex and environment-friendly structures that mitigate greenhouse gas emissions. However, printing high concentrations of NC into intricate structures encounters substantial challenges due to inadequate adhesion between the printed layers attributed to a high cellulose solid content, resulting in low shape fidelity and mechanical properties. Therefore, to address these challenges, this paper reports lignin (LG) blending, a nanofiller, in high-content NC (>25 wt % solid content) paste to improve the layer adhesion of three-dimensional (3D) printed structures. The printed structures are dried in a clean room condition followed by postcuring. The optimized lignocellulose (0.5LG-NC) paste showed high structural shape fidelity, remarkable flexural strength, and moduli of 102.93 ± 0.96 MPa and 9.05 ± 0.07 GPa. Furthermore, the volumetric shrinkage behavior in box-like 3D printed structures with optimized LG-NC paste shows low standard deviations, demonstrating the repeatability of the printed structures. The study can be adapted for high-performance engineering and biomedical applications to manufacture high mechanical strength environment-friendly structures.
纳米纤维素（NC）材料的增材制造是一个新兴的技术领域，它有助于制造复杂且环保的结构，从而减少温室气体排放。然而，由于高纤维素固体含量导致打印层之间的附着力不足，将高浓度的NC打印成复杂结构会遇到重大挑战，进而导致形状保真度和机械性能较低。因此，为应对这些挑战，本文报道了在高含量NC（固体含量>25 wt%）糊剂中添加木质素（LG）作为纳米填料，以改善三维（3D）打印结构的层间附着力。打印后的结构在洁净室条件下干燥，然后进行后固化处理。优化后的木质纤维素（0.5LG-NC）糊剂显示出高结构形状保真度、显著的弯曲强度，模量分别为102.93±0.96 MPa和9.05±0.07 GPa。此外，使用优化后的LG-NC糊剂打印的盒状3D结构的体积收缩行为显示出较低的标准偏差，证明了打印结构的可重复性。该研究可应用于高性能工程和生物医学领域，以制造具有高机械强度的环保结构。
