Jin Jiongke, Wu Xun-En, Liang Huarun, Wang Haomin, Li Shuo, Lu Haojie, Bi Peng, Niu Jiali, Wu Yang, Zhang Yingying
Department of Chemistry, Key Laboratory of Organic Optoelectronics and Molecular Engineering of the Ministry of Education, Tsinghua University, Beijing 100084, P. R. China.
Beijing National Laboratory for Molecular Sciences, The Key Laboratory of Polymer Chemistry and Physics of Ministry of Education, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, P. R. China.
Mater Horiz. 2023 Oct 2;10(10):4626-4634. doi: 10.1039/d3mh00866e.
While nanomaterials possess impressive mechanical properties at the microscale level, their macroscopic assemblies usually exhibit inferior properties due to ineffective stress transfer among individual nanomaterials. This issue is addressed in this work by achieving strong interfacial interactions between aramid nanofibers and graphene oxide nanosheets through a neutralization reaction in a dipolar solvent and regulating the topological properties using polymer micelles to form a compact structure, leading to the formation of a super-strong and super-tough nanofiber film. The film was prepared through a sol-gel-film transition process and possesses a nacre-like microstructure that deflects microcracks and prevents them from propagating straight through the film. Remarkably, it demonstrates a tensile strength of 599.0 MPa and a toughness of 37.7 MJ m, which are 491.0% and 1094.5% that of a pristine aramid nanofiber film, respectively. In addition, it exhibits excellent tolerance to extreme temperatures (-196 to 300 °C) and fatigue resistance to folding 10 000 times. Overall, this study presents a synergistic interfacial and topological enhancement strategy for constructing nanomaterial-based composites with inherited properties from the nanoscale building blocks to the macroscale structural material.
虽然纳米材料在微观尺度上具有令人印象深刻的机械性能，但由于单个纳米材料之间的应力传递效率低下，它们的宏观组装体通常表现出较差的性能。在这项工作中，通过在偶极溶剂中进行中和反应，实现芳纶纳米纤维与氧化石墨烯纳米片之间的强界面相互作用，并使用聚合物胶束调节拓扑性质以形成致密结构，从而解决了这个问题，进而形成了一种超强且超韧的纳米纤维薄膜。该薄膜通过溶胶 - 凝胶 - 薄膜转变过程制备而成，具有类似珍珠母的微观结构，能够使微裂纹发生偏转并防止它们直接贯穿薄膜。值得注意的是，它的拉伸强度为599.0兆帕，韧性为37.7兆焦/平方米，分别是原始芳纶纳米纤维薄膜的491.0%和1094.5%。此外，它对极端温度（-196至300°C）具有出色的耐受性，并且对折叠10000次具有抗疲劳性。总体而言，本研究提出了一种协同的界面和拓扑增强策略，用于构建从纳米级构建块到宏观结构材料都具有继承特性的纳米材料基复合材料。
