Jin Biqiang, Wu Wenqiang, Wu Haitao
College of Science, Xichang University, Xichang 615000, China.
State Key Laboratory of Polymer Materials Engineering, College of Polymer Science and Engineering, Sichuan University, Chengdu 610065, China.
Polymers (Basel). 2023 Oct 8;15(19):4020. doi: 10.3390/polym15194020.
The fabrication of mechanically robust and self-healing polymeric materials remains a formidable challenge. To address the drawbacks, a core strategy is proposed based on the dynamic hard domains formed by hierarchical hydrogen bonds and disulfide bonds. The dynamic hard domains dissipate considerable stress energy during stretching. Meanwhile, the synergistic effect of hierarchical hydrogen bonds and disulfide bonds greatly enhances the relaxation dynamics of the PU network chains, thus accelerating network reorganization. Therefore, this designed strategy effectively solves the inherent drawback between cohesive energy and relaxation dynamics of the PU network. As a result, the PU elastomer has excellent mechanical properties (9.9 MPa and 44.87 MJ/m) and high self-healing efficiency (96.2%). This approach provides a universal but valid strategy to fabricate high-performance self-healing polymeric materials. Meanwhile, such materials can be extended to emerging fields such as flexible robotics and wearable electronics.
制备机械坚固且具有自修复功能的聚合物材料仍然是一项艰巨的挑战。为了解决这些缺点，基于由分层氢键和二硫键形成的动态硬域提出了一种核心策略。动态硬域在拉伸过程中耗散大量应力能量。同时，分层氢键和二硫键的协同效应极大地增强了聚氨酯网络链的松弛动力学，从而加速了网络重组。因此，这种设计策略有效地解决了聚氨酯网络内聚能和松弛动力学之间的固有缺点。结果，聚氨酯弹性体具有优异的机械性能（9.9兆帕和44.87兆焦/立方米）和高自修复效率（96.2%）。这种方法为制备高性能自修复聚合物材料提供了一种通用且有效的策略。同时，此类材料可扩展到柔性机器人和可穿戴电子等新兴领域。
