Graduate School of Natural Science and Technology, Kanazawa University, Kanazawa 920-1192, Japan.
Institute of Science and Engineering, Kanazawa University, Kanazawa 920-1192, Japan.
Int J Mol Sci. 2023 Dec 20;25(1):69. doi: 10.3390/ijms25010069.
Bacterial cellulose, as an important renewable bioresource, exhibits excellent mechanical properties along with intrinsic biodegradability. It is expected to replace non-degradable plastics and reduce severe environmental pollution. In this study, using dry jet-wet spinning and stretching methods, we fabricate cellulose composite macrofibers using nanofibrillated bacterial cellulose (BCNFs) which were obtained by agitated fermentation. Ionic liquid (IL) was used as a solvent to perform wet spinning. In this process, force-induced alignment of BCNFs was applied to enhance the mechanical properties of the macrofibers. The results of scanning electron microscopy revealed the well-aligned structure of BCNF along the fiber axis. The fiber prepared with an extrusion rate of 30 m min and a stretching ratio of 46% exhibited a strength of 174 MPa and a Young's modulus of 13.7 GPa. In addition, we investigated the co-spinning of carboxymethyl cellulose-containing BCNF with chitosan using IL as a "container", which indicated the compatibility of BCNFs with other polysaccharides. Recycling of the ionic liquid was also verified to validate the sustainability of our strategy. This study provides a scalable method to fabricate bacterial cellulose composite fibers, which can be applied in the textile or biomaterial industries with further functionalization.
细菌纤维素作为一种重要的可再生生物资源，具有优异的机械性能和内在的可生物降解性。它有望替代不可降解的塑料，减少严重的环境污染。在这项研究中，我们使用干喷湿纺和拉伸的方法，用通过搅拌发酵得到的纳米原纤化细菌纤维素（BCNFs）来制备纤维素复合宏观纤维。离子液体（IL）被用作纺丝溶剂。在这个过程中，施加力使 BCNFs 取向排列，以提高宏观纤维的机械性能。扫描电子显微镜的结果显示，BCNF 沿着纤维轴具有良好的取向结构。在挤出速率为 30 m min 和拉伸比为 46%的条件下制备的纤维，其强度为 174 MPa，杨氏模量为 13.7 GPa。此外，我们还研究了在离子液体作为“容器”的情况下，含羧甲基纤维素的 BCNF 与壳聚糖的共纺，这表明 BCNFs 与其他多糖具有相容性。还验证了离子液体的回收，以验证我们策略的可持续性。本研究提供了一种可扩展的方法来制备细菌纤维素复合纤维，可进一步功能化后应用于纺织或生物材料行业。
