Biofuels Institute, School of the Environment and Safety Engineering, Jiangsu University, Zhenjiang 212013, China.
Institute of Textiles and Clothing, The Hong Kong Polytechnic University, Hong Kong, China.
Molecules. 2020 May 15;25(10):2319. doi: 10.3390/molecules25102319.
As direct digital manufacturing, 3D printing (3DP) technology provides new development directions and opportunities for the high-value utilization of a wide range of biological materials. Cellulose nanofibrils (CNF) and polylactic acid (PLA) biocomposite filaments for fused deposition modeling (FDM) 3DP were developed in this study. Firstly, CNF was isolated by enzymatic hydrolysis combined with high-pressure homogenization. CNF/PLA filaments were then prepared by melt-extrusion of PLA as the matrix and CNF as the filler. Thermal stability, mechanical performance, and water absorption property of biocomposite filaments and 3D-printed objects were analyzed. Findings showed that CNF increased the thermal stability of the PLA/PEG600/CNF composite. Compared to unfilled PLA FDM filaments, the CNF filled PLA biocomposite filament showed an increase of 33% in tensile strength and 19% in elongation at break, suggesting better compatibility for desktop FDM 3DP. This study provided a new potential for the high-value utilization of CNF in 3DP in consumer product applications.
作为直接数字制造，3D 打印（3DP）技术为广泛的生物材料的高价值利用提供了新的发展方向和机会。本研究开发了用于熔丝制造（FDM）3DP 的纤维素纳米纤维（CNF）和聚乳酸（PLA）生物复合材料丝。首先，通过酶水解结合高压匀浆分离 CNF。然后通过 PLA 作为基质和 CNF 作为填充剂的熔融挤出制备 CNF/PLA 纤维。分析了生物复合材料纤维和 3D 打印制品的热稳定性、机械性能和吸水性。结果表明，CNF 提高了 PLA/PEG600/CNF 复合材料的热稳定性。与未填充 PLA 的 FDM 纤维相比，填充 CNF 的 PLA 生物复合材料纤维的拉伸强度提高了 33%，断裂伸长率提高了 19%，表明更适合桌面 FDM 3DP。本研究为 CNF 在消费产品应用的 3DP 中的高价值利用提供了新的潜力。
