Kafy Abdullahil, Kim Hyun Chan, Zhai Lindong, Kim Jung Woong, Hai Le Van, Kang Tae June, Kim Jaehwan
Creative Research Center for Nanocellulose Future Composites, Department of Mechanical Engineering, Inha University, Incheon, 222212, Republic of Korea.
Advanced Materials Laboratory, Department of Mechanical Engineering, Inha University, Incheon, 222212, Republic of Korea.
Sci Rep. 2017 Dec 15;7(1):17683. doi: 10.1038/s41598-017-17713-3.
Cellulose nanofiber (CNF) with high crystallinity has great mechanical stiffness and strength. However, its length is too short to be used for fibers of environmentally friendly structural composites. This paper presents a fabrication process of cellulose long fiber from CNF suspension by spinning, stretching and drying. Isolation of CNF from the hardwood pulp is done by using (2, 2, 6, 6-tetramethylpiperidine-1-yl) oxidanyl (TEMPO) oxidation. The effect of spinning speed and stretching ratio on mechanical properties of the fabricated fibers are investigated. The modulus of the fabricated fibers increases with the spinning speed as well as the stretching ratio because of the orientation of CNFs. The fabricated long fiber exhibits the maximum tensile modulus of 23.9 GPa with the maximum tensile strength of 383.3 MPa. Moreover, the fabricated long fiber exhibits high strain at break, which indicates high toughness. The results indicate that strong and tough cellulose long fiber can be produced by using ionic crosslinking, controlling spinning speed, stretching and drying.
具有高结晶度的纤维素纳米纤维（CNF）具有很高的机械刚度和强度。然而，其长度太短，无法用于环保型结构复合材料的纤维。本文介绍了一种通过纺丝、拉伸和干燥从CNF悬浮液制备纤维素长纤维的工艺。通过使用（2,2,6,6-四甲基哌啶-1-基）氧化自由基（TEMPO）氧化从阔叶木浆中分离出CNF。研究了纺丝速度和拉伸比对所制备纤维力学性能的影响。由于CNF的取向，所制备纤维的模量随着纺丝速度和拉伸比的增加而增加。所制备的长纤维表现出最大拉伸模量为23.9 GPa，最大拉伸强度为383.3 MPa。此外，所制备的长纤维在断裂时表现出高应变，这表明其具有高韧性。结果表明，通过离子交联、控制纺丝速度、拉伸和干燥可以制备出强度高且韧性好的纤维素长纤维。
