School of Mechanics and Civil & Architecture, Northwestern Polytechnical University, Xi'an 710129, PR China.
Zhongkexin Engineering Consulting (Beijjing) Co., Ltd., Beijing 100039, China.
Langmuir. 2022 Jul 26;38(29):8862-8870. doi: 10.1021/acs.langmuir.2c00955. Epub 2022 Jul 12.
The self-healing property of biological tissues gives humans inspiration to endow artificial synthetic materials with self-healing functions. Herein, we report a thermoplastic elastomer that can be self-repaired in a short time, which uses dual dynamic bonds (hydrogen bonds and disulfide bonds) coupled to realize its self-healing function through the rapid conversion of dynamic hydrogen bonds between the hard and soft segments, as well as the dynamic bonding and dissociation of disulfide bonds. Furthermore, the maximum tensile strength and strain of the elastomer can reach 17.4 MPa and 3780%, respectively, and the maximum self-healing rate is close to 100% (temperature: 90 °C, time: 5 h). The arrays' arrangement and reversibility of hydrogen bonds endow the elastomer with high toughness and self-healing properties and thus solve the problem that ordinary polymers cannot self-heal.
生物组织的自修复特性启发人类为人工合成材料赋予自修复功能。在这里，我们报道了一种热塑性弹性体，它可以在短时间内自我修复，该弹性体利用双重动态键（氢键和二硫键）耦合，通过硬段和软段之间快速转换动态氢键，以及二硫键的动态键合和解离来实现其自修复功能。此外，该弹性体的最大拉伸强度和应变分别可达 17.4 MPa 和 3780%，最大自修复率接近 100%（温度：90°C，时间：5 h）。氢键的排列和可逆性赋予了弹性体高韧性和自修复性能，从而解决了普通聚合物无法自修复的问题。
