Novel titin-inspired high-performance polyurethanes with self-healing and recyclable capacities based on dual dynamic network

编号 020031801

推送时间 20211122

研究领域 林产化工 

年份 2021 

类型 期刊 

语种 英语

标题 Novel titin-inspired high-performance polyurethanes with self-healing and recyclable capacities based on dual dynamic network

来源期刊 Polymer

期 第318期

发表时间 20210811

关键词 Titin-inspired;  Dual dynamic network;  Super-high strength;  Self-healing;  Recyclable; 

摘要 It is still a huge challenge that integrating excellent mechanical performance and high healing efficiency into self-healing materials at the same time, even if numerous dynamic bonds have been explored in preparing of self-healing materials in the last 20 years. Herein, we reported a novel titin-inspired strategy to prepare the?polyurethanes?via introducing dual dynamic network which contained the physical cross-linking of quadruple?hydrogen bonds?formed by 5-(2-hydroxyethyl)-6-methyl-2-aminouracil (UPy) dimers and the covalent cross-linking of Diels-Alder (D-A) bonds. Specially, relying on the synergistic effect of the dual dynamic network, the resulting polyurethane F50U50-PU exhibited admirable mechanical performance, such as a super-high strength of 51.9?MPa, a superb toughness of 166.7?MJ/m3?and a large elongation at break of 930%. Meanwhile, on account of the dynamic feature of quadruple hydrogen bonds and D-A bonds, the resulting polyurethane showed a high heat-induced healing efficiency of 91.2%. More importantly, the polyurethanes could be recycled by hot-pressing process to regain their initial mechanical properties and integrity. And it was also used as substrate to construct self-healing conductive device, which displayed splendid self-healing of electrical?conductivity?after damage. It can be envisioned that the polyurethanes with both superior mechanical performance and high healing efficiencies have great application prospect in multifarious fields.

服务人员 尚玮姣

服务院士 宋湛谦

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