一种具有形状记忆辅助自愈合和聚集诱导发光特性的可拉伸、机械性能稳定的聚合物。

A stretchable, mechanically robust polymer exhibiting shape-memory-assisted self-healing and clustering-triggered emission.

作者信息

Wang Xiaoyue, Xu Jing, Zhang Yaoming, Wang Tingmei, Wang Qihua, Li Song, Yang Zenghui, Zhang Xinrui

机构信息

Key Laboratory of Science and Technology on Wear and Protection of Materials, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou, 730000, China.

Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, 100049, China.

出版信息

Nat Commun. 2023 Aug 5;14(1):4712. doi: 10.1038/s41467-023-40340-8.

Self-healing and recyclable polymer materials are being developed through extensive investigations on noncovalent bond interactions. However, they typically exhibit inferior mechanical properties. Therefore, the present study is aimed at synthesizing a polyurethane-urea elastomer with excellent mechanical properties and shape-memory-assisted self-healing behavior. In particular, the introduction of coordination and hydrogen bonds into elastomer leads to the optimal elastomer exhibiting good mechanical properties (strength, 76.37 MPa; elongation at break, 839.10%; toughness, 308.63 MJ m) owing to the phased energy dissipation mechanism involving various supramolecular interactions. The elastomer also demonstrates shape-memory properties, whereby the shape recovery force that brings damaged surfaces closer and facilitates self-healing. Surprisingly, all specimens exhibite clustering-triggered emission, with cyan fluorescence is observed under ultraviolet light. The strategy reported herein for developing multifunctional materials with good mechanical properties can be leveraged to yield stimulus-responsive polymers and smart seals.

通过对非共价键相互作用的广泛研究，正在开发自修复和可回收的聚合物材料。然而，它们通常表现出较差的机械性能。因此，本研究旨在合成一种具有优异机械性能和形状记忆辅助自修复行为的聚氨酯 - 脲弹性体。特别是，将配位键和氢键引入弹性体中，由于涉及各种超分子相互作用的相能量耗散机制，使得优化后的弹性体具有良好的机械性能（强度，76.37 MPa；断裂伸长率，839.10%；韧性，308.63 MJ m）。该弹性体还表现出形状记忆特性，即形状恢复力可使受损表面靠近并促进自修复。令人惊讶的是，所有样品都表现出聚集诱导发光，在紫外光下观察到青色荧光。本文报道的开发具有良好机械性能的多功能材料的策略可用于生产刺激响应性聚合物和智能密封件。