聚脲
材料科学
韧性
自愈
氢键
自愈材料
极限抗拉强度
聚合物
复合材料
延伸率
化学工程
分子
化学
聚氨酯
有机化学
医学
替代医学
病理
工程类
作者
Yujia Hao,Guangming Zhu,Ben Li
标识
DOI:10.1021/acs.iecr.3c00693
摘要
The synthesis of polymeric materials that simultaneously possess multiple outstanding mechanical properties and self-healability is always a great challenge. Herein, we report the synthesis of a robust and self-healing polyurea material, which contains a dual metal coordination structure of Zn(II)-urea and Zn(II)-diamidepyridine as well as dense hydrogen bonds. Due to the synergistic enhancement of dynamic coordination bonds and hydrogen bonds in the supramolecular network, the obtained polyurea materials possess a combination of excellent mechanical properties and high-efficiency self-healing properties, which are adjustable by varying the content of Zn(II) ions. The optimal PU-L/Zn-3 sample has a tensile strength of ∼22.82 MPa, while the elongation at break is ∼1312% and the toughness is ∼222.68 MJ/m3. In addition, the fully cut sample exhibits a high healing efficiency of 95.7% based on toughness after treatment at 50 °C for 4 h. Multi-dynamic cross-linked polymers might provide a new way to obtain robust self-healing materials for protection materials and wearable electronics.
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