Nano-sized cellulose fibers are successfully fabricated by the fibrillation of wood pulp cellulose into submicron and/or nanoscale nanofibers with a high pressure homogenizer. Cellulose nanofibers (CNFs) have great potential as reinforcing materials for polymeric composite materials due to their excellent mechanical properties. In this study, the change of crystallinity index ( CI ) of the CNFs was investigated with changing the nozzle diameter and flow pressure of the homogenizer for the preparations of the CNFs. In addition, the nanopaper was produced using the CNFs prepared in this study and the specific surface area ( SSA ) of the nanopaper was measured to confirm the quality of the CNFs. The CNF-reinforced nanocomposites were produced with polyamide 6 (PA6) fibers which had the different fiber lengths. The morphological structures and tensile properties of the CNF/PA6 nanocomposites were investigated with the CNF content and length of PA6 fibers. The tensile strength and modulus of PA6 composites reinforced by CNFs of 40 % by weight were almost three and eight times higher compared to those of PA6, respectively. The increase in the tensile properties, crystallinity index, and specific surface area of the nanopapers successfully demonstrated the potential use of cellulose nanofibers in the reinforcement for polymer nanocomposites.

中文翻译：

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纤维素纳米纤维增强热塑性复合材料的制备

通过用高压均质器将木浆纤维素原纤化为亚微米和/或纳米级纳米纤维，成功地制造了纳米级纤维素纤维。纤维素纳米纤维（CNFs）由于其优异的机械性能，具有作为聚合物复合材料增强材料的巨大潜力。在这项研究中，研究了CNF的结晶度指数（ CI ）的变化，其中改变了制备CNF的均质器的喷嘴直径和流动压力。此外，使用本研究中制备的CNF和比表面积（ SSA 测量纳米纸的）以确认CNF的质量。用具有不同纤维长度的聚酰胺6（PA6）纤维生产CNF增强的纳米复合材料。通过CNF含量和PA6纤维长度，研究了CNF / PA6纳米复合材料的形貌结构和拉伸性能。用CNF增强40％（重量）的PA6复合材料的抗张强度和模量分别比PA6的抗张强度和模量高出近三倍和八倍。纳米纸的拉伸性能，结晶度指数和比表面积的增加成功地证明了纤维素纳米纤维在聚合物纳米复合材料的增强中的潜在用途。