Guan Qing-Fang, Yang Huai-Bin, Han Zi-Meng, Zhou Li-Chuan, Zhu Yin-Bo, Ling Zhang-Chi, Jiang He-Bin, Wang Peng-Fei, Ma Tao, Wu Heng-An, Yu Shu-Hong
Division of Nanomaterials and Chemistry, Hefei National Laboratory for Physical Sciences at the Microscale, Chinese Academy of Sciences (CAS) Center for Excellence in Nanoscience, Hefei Science Center of CAS, Department of Chemistry, Institute of Biomimetic Materials & Chemistry, 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 230027, China.
Sci Adv. 2020 May 1;6(18):eaaz1114. doi: 10.1126/sciadv.aaz1114. eCollection 2020 May.
Sustainable structural materials with light weight, great thermal dimensional stability, and superb mechanical properties are vitally important for engineering application, but the intrinsic conflict among some material properties (e.g., strength and toughness) makes it challenging to realize these performance indexes at the same time under wide service conditions. Here, we report a robust and feasible strategy to process cellulose nanofiber (CNF) into a high-performance sustainable bulk structural material with low density, excellent strength and toughness, and great thermal dimensional stability. The obtained cellulose nanofiber plate (CNFP) has high specific strength [198 MPa/(Mg m)], high specific impact toughness [67 kJ m/(Mg m)], and low thermal expansion coefficient (<5 × 10 K), which shows distinct and superior properties to typical polymers, metals, and ceramics, making it a low-cost, high-performance, and environmental-friendly alternative for engineering requirement, especially for aerospace applications.
具有轻质、优异的热尺寸稳定性和卓越机械性能的可持续结构材料对工程应用至关重要，但某些材料性能（如强度和韧性）之间的内在冲突使得在广泛的使用条件下同时实现这些性能指标具有挑战性。在此，我们报告了一种稳健且可行的策略，可将纤维素纳米纤维（CNF）加工成具有低密度、优异强度和韧性以及出色热尺寸稳定性的高性能可持续块状结构材料。所获得的纤维素纳米纤维板（CNFP）具有高比强度[约198MPa/(Mg·m)]、高比冲击韧性[约67kJ·m/(Mg·m)]和低热膨胀系数（<5×10⁻⁶K⁻¹），与典型的聚合物、金属和陶瓷相比，显示出独特且优越的性能，使其成为满足工程需求，特别是航空航天应用的低成本、高性能和环保的替代品。
