材料科学
极限抗拉强度
弹性体
自愈
复合材料
金属
聚氨酯
单体
模数
弹性模量
聚合物
冶金
医学
病理
替代医学
作者
Guangjie Gai,Libin Liu,Cheng‐Hui Li,Ranjita K. Bose,Dong Li,Ning Guo,Biao Kong
标识
DOI:10.1002/cplu.201900095
摘要
Abstract Self‐healing materials can prolong device life, but their relatively weak mechanical strength limits their applications. Introducing tunable metal‐ligand interactions into self‐healing systems can improve their mechanical strength. However, applying this concept to solid elastomers is a challenge. To address this need, polyurethane‐containing metal complexes were fabricated by introduction of a pyridine‐containing ligand into polyurethane, and subsequent coordination with Fe 2+ . The strong reversible coordination bond provides mechanical strength and self‐healing ability. By optimizing the monomer ratio and Fe 2+ content, the resulting complex possesses a very high tensile strength of 4.6 MPa at strain of around 498 % and a high Young's modulus (3.2 MPa). Importantly, the metal complex exhibits an extremely high self‐healing efficiency of approximately 96 % of tensile strength at room temperature and around 30 % at 5 °C. The complex is notch‐insensitive and the fracture energy is 76186 J/m 2 , which is among the highest reported values for self‐healing systems.
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