Huang Hongfei, Sun Wei, Sun Lijie, Zhang Luzhi, Wang Yang, Zhang Youwei, Gu Shijia, You Zhengwei, Zhu Meifang
State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Institute of Functional Materials, College of Materials Science and Engineering, Donghua University, Research Base of Textile Materials for Flexible Electronics and Biomedical Applications (China Textile Engineering Society), Shanghai Key Laboratory of Lightweight Composite, Shanghai Engineering Research Center of Nano-Biomaterials and Regenerative Medicine, Shanghai 201620, People's Republic of China.
Proc Natl Acad Sci U S A. 2024 Aug 20;121(34):e2404726121. doi: 10.1073/pnas.2404726121. Epub 2024 Aug 15.
Self-healing covalent adaptable networks (CANs) are not only of fundamental interest but also of practical importance for achieving carbon neutrality and sustainable development. However, there is a trade-off between the mobility and cross-linking structure of CANs, making it challenging to develop CANs with excellent mechanical properties and high self-healing efficiency. Here, we report the utilization of a highly dynamic four-arm cross-linking unit with an internally catalyzed oxime-urethane group to obtain CAN-based ionogel with both high self-healing efficiency (>92.1%) at room temperature and superior mechanical properties (tensile strength 4.55 MPa and toughness 13.49 MJ m). This work demonstrates the significant potential of utilizing the synergistic electronic, spatial, and topological effects as a design strategy for developing high-performance materials.
自修复共价自适应网络（CANs）不仅具有重要的基础研究价值，而且对于实现碳中和和可持续发展具有实际意义。然而，CANs的流动性和交联结构之间存在权衡，这使得开发具有优异机械性能和高自修复效率的CANs具有挑战性。在此，我们报道了利用具有内部催化肟-聚氨酯基团的高动态四臂交联单元来制备基于CAN的离子凝胶，该离子凝胶在室温下具有高自修复效率（>92.1%）和优异的机械性能（拉伸强度4.55 MPa，韧性13.49 MJ m）。这项工作展示了利用协同的电子、空间和拓扑效应作为设计策略来开发高性能材料的巨大潜力。
