通过磷酸化纤维素纳米纤维的微流控湿法纺丝制备高强阻燃微纤维。
Ultrastrong and flame-retardant microfibers via microfluidic wet spinning of phosphorylated cellulose nanofibrils.
机构信息
State Key Laboratory of Chemical Engineering, Tianjin Key Laboratory of Membrane Science and Desalination Technology, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, PR China.
State Key Laboratory of Chemical Engineering, Tianjin Key Laboratory of Membrane Science and Desalination Technology, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, PR China.
出版信息
Carbohydr Polym. 2022 Nov 15;296:119945. doi: 10.1016/j.carbpol.2022.119945. Epub 2022 Aug 3.
Translation of the high mechanical properties of cellulose nanofibrils (CNFs) to macroscopic fibers represents a great challenge due to difficulties in the assembly of CNFs into well-ordered structures. In this study, we report the ultrastrong and flame-retardant microfibers via the microfluidic wet spinning of phosphorylated cellulose nanofibrils (PCNFs) with high charge content. The macroscopic stress is effectively transferred to the individual PCNFs and results in a Young's modulus of 29 GPa and a tensile strength of 654 MPa. The as-prepared microfibers retain >85 % strength in the wet hydration state, exceeding most natural or synthetic microfibers. Furthermore, glycerol and egg yolk were introduced to the microfibers for enhancing the modulus (31 GPa), strength (865 MPa) and the strain to failure (10.95 %). In addition, the PCNFs microfibers have good flame retardancy. This study expands the potential applications of nanocellulose microfibers in biomedical and flame-retardant materials.
由于将纤维素纳米纤维（CNF）组装成有序结构存在困难，因此将纤维素纳米纤维的高机械性能转化为宏观纤维是一项巨大的挑战。在这项研究中，我们通过具有高电荷含量的磷酸化纤维素纳米纤维（PCNF）的微流体制备了超强度和阻燃的微纤维。宏观应力有效地传递到各个 PCNF 上，从而使杨氏模量达到 29 GPa，拉伸强度达到 654 MPa。所制备的微纤维在湿水合状态下保留超过 85%的强度，超过了大多数天然或合成的微纤维。此外，甘油和蛋黄被引入微纤维中以提高模量（31 GPa）、强度（865 MPa）和断裂伸长率（10.95%）。此外，PCNF 微纤维具有良好的阻燃性。这项研究扩展了纳米纤维素微纤维在生物医学和阻燃材料中的潜在应用。
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