Jin Biqiang, Wu Wenqiang, Yuan Zhaoyang, Wang Changcheng
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 9;15(19):4025. doi: 10.3390/polym15194025.
Recently, many tough synthetic hydrogels have been created as promising candidates in fields such as smart electronic devices. In this paper, we propose a simple strategy to construct tough and robust hydrogels. Two-dimensional TiCT MXene nanosheets and metal ions were introduced into poly(acrylamide-co-acrylic acid) hydrogels, the MXene nanosheets acted as multifunctional cross-linkers and effective stress-transfer centers, and physical cross-links were formed between Fe and carboxylic acid. Under deformation, the coordination interactions exhibit reversible dissociation and reorganization properties, suggesting a novel mechanism of energy dissipation and stress redistribution. The design enabled the hydrogel to exhibit outstanding and balanced mechanical properties (tensile strength of up to 5.67 MPa and elongation at break of up to 508%). This study will facilitate the diverse applications of metallosupramolecular hydrogels.
最近，许多坚韧的合成水凝胶已被制备出来，成为智能电子设备等领域中很有前景的候选材料。在本文中，我们提出了一种构建坚韧且坚固水凝胶的简单策略。将二维TiCT MXene纳米片和金属离子引入聚（丙烯酰胺-共-丙烯酸）水凝胶中，MXene纳米片充当多功能交联剂和有效的应力传递中心，并且在铁和羧酸之间形成了物理交联。在变形过程中，配位相互作用表现出可逆的解离和重组特性，这表明了一种新的能量耗散和应力重新分布机制。这种设计使水凝胶能够展现出优异且平衡的力学性能（拉伸强度高达5.67 MPa，断裂伸长率高达508%）。这项研究将促进金属超分子水凝胶的多样化应用。
