Super-Strong and Super-Stiff Chitosan Filaments with Highly Ordered Hierarchical Structure
Super-Strong and Super-Stiff Chitosan Filaments with Highly Ordered Hierarchical Structure
复制标题
具有高度有序分级结构的超强超硬壳聚糖长丝
DOI：
10.1002/adfm.202104368
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发表时间：
2021-07-03
影响因子：
19
通讯作者：
Cai, Jie
中科院分区：
文献类型：
--
作者：
Chen, Yijun;Zhang, Qing;Cai, Jie
目前，全球正面临不可再生化石资源逐渐枯竭、不可降解塑料垃圾对陆地和海洋生态环境危害严重等问题。由于对纤维材料的需求迅速增加，开发高性能的生物质基纤维已成为减少对石油基合成纤维依赖的重要研究课题。在这项研究中，一种新的绿色湿法纺丝策略是用于制造超强和超硬壳聚糖长丝从KOH/尿素水溶液使用两步拉伸过程。所得长丝的高度有序的分级结构有助于其优异的机械性能。壳聚糖长丝的拉伸强度和杨氏模量分别为878 +/- 123 MPa和44.7 +/- 12.3 GPa，这些值与蜘蛛丝和细菌纤维素的值相当。本研究所制得之壳聚糖纤维之比强度及比模量均优于低密度钢之上级。本研究提出的绿色和可规模化策略将拓宽壳聚糖长丝在柔性生物电子、生物材料和纺织品等领域的应用范围。
Currently, the world is facing the problems of the gradual depletion of non-renewable fossil resources and the severe harm of non-degradable plastic waste to the land and marine ecological environment. Because of the rapid increase in the demand for fiber materials, the development of high-performance biomass-based fibers has emerged as an important research topic to reduce the reliance on petroleum-based synthetic fibers. In this study, a novel green wet-spinning strategy is used for the fabrication of super-strong and super-stiff chitosan filaments from an aqueous KOH/urea solution using a two-step drawing process. The highly ordered hierarchical structure of the resulting filaments contributes to their excellent mechanical properties. The tensile strength and Young's modulus of the chitosan filaments are 878 +/- 123 MPa and 44.7 +/- 12.3 GPa, respectively, and these values are comparable to those of spider silk and bacterial cellulose. The chitosan filaments prepared in this study are superior to low-density steel in terms of the specific strength and modulus. The green and scalable strategy proposed in this study will broaden the application range of chitosan filaments in flexible bioelectronics, biomaterials, and textiles.