Zhang Zhen-Bang, He ZeZhou, Pan Xiao-Feng, Gao Huai-Ling, Chen Si-Ming, Zhu YinBo, Cao Saisai, Zhao Chunyu, Wu Shuang, Gong Xinglong, Wu HengAn, Yu Shu-Hong
Department of Chemistry, Institute of Biomimetic Materials & Chemistry, Anhui Engineering Laboratory of Biomimetic Materials, Division of Nanomaterials & Chemistry, Hefei National Research Center for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, 230026, China.
CAS Key Laboratory of Mechanical Behavior and Design of Materials, Department of Modern Mechanics, CAS Center for Excellence in Complex System Mechanics, University of Science and Technology of China, Hefei, Anhui, 230027, China.
Small. 2023 Jan;19(2):e2205219. doi: 10.1002/smll.202205219. Epub 2022 Nov 20.
Lightweight and impact-resistant materials with self-monitoring capability are highly desired for protective applications, but are challenging to be artificially fabricated. Herein, a scalable-manufactured aramid nanofiber (ANF)-based composite combining these key properties is presented. Inspired by the strengthening and toughening mechanisms relying on recoverable interfaces commonly existing in biological composites, mechanically weak but dense hydrogen bonds are introduced into the ANF interfaces to achieve simultaneously enhanced tensile strength (300 MPa), toughness (55 MJ m ), and impact resistance of the nanofibrous composite. The achieved mechanical property combination displays attractive advantages compared with that of most of previously reported nanocomposites. Additionally, the nanofibrous composite is designed with a capability for real-time self-monitoring of its structural safety during both quasi-static tensile and dynamic impact processes, based on the strain/damage-induced resistance variations of a conductive nanowire network inside it. These comprehensive properties enable the present nanofibrous composite with promising potential for protective applications.
具有自我监测能力的轻质且抗冲击材料在防护应用中备受青睐，但人工制造具有挑战性。在此，展示了一种可规模化制造的、具备这些关键特性的芳纶纳米纤维（ANF）基复合材料。受生物复合材料中常见的依赖可恢复界面的增强增韧机制启发，在ANF界面引入机械性能较弱但密集的氢键，以同时提高纳米纤维复合材料的拉伸强度（300兆帕）、韧性（55兆焦/立方米）和抗冲击性。与大多数先前报道的纳米复合材料相比，所实现的机械性能组合具有显著优势。此外，基于纳米纤维复合材料内部导电纳米线网络的应变/损伤诱导电阻变化，该纳米纤维复合材料被设计为能够在准静态拉伸和动态冲击过程中实时自我监测其结构安全性。这些综合性能使当前的纳米纤维复合材料在防护应用中具有广阔的潜在应用前景。
