Academy for Advanced Interdisciplinary Science and Technology, Beijing Advanced Innovation Center for Materials Genome Engineering, University of Science and Technology Beijing, Beijing 100083, People's Republic of China.
Beijing Key Laboratory for Advanced Energy Materials and Technologies, School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, People's Republic of China.
ACS Nano. 2021 Dec 28;15(12):20656-20665. doi: 10.1021/acsnano.1c09732. Epub 2021 Nov 30.
Increasing biomechanical applications of skin-inspired devices raise higher requirements for the skin-bionic robustness and environmental compatibility of elastomers. Here, a tough and degradable self-healing elastomer (TDSE) is developed by a synergistic soft-hard segments design. The polyester/polyether copolymer is introduced in soft segments to endow TDSE with flexibility and degradability. The two isomeric diamines are regulated in hard segments for elevating the toughness and fracture energy to 82.38 MJ/m and 43299 J/m and autonomous self-healing ability with 93% efficiency in 7 h for the TDSE. Employing TDSE and ionic liquid, a biomechano-robust artificial skin (BA-skin) is constructed with a stretch-insensitive mechanosensation capability during 50% cyclic stretching. The BA-skin has high biomechano-robustness to bear tear damage and good environmental compatibility with total decomposability in a lipase solution. This work provides a molecular design guideline for high-performance skin-bionic elastomers for applications in skin-inspired devices.
越来越多的基于仿生皮肤的设备的生物力学应用对弹性体的皮肤仿生韧性和环境兼容性提出了更高的要求。在这里，通过协同的软-硬段设计，开发了一种坚韧且可降解的自修复弹性体（TDSE）。聚酯/聚醚共聚物被引入软段，使 TDSE 具有柔韧性和可降解性。在硬段中调节两种异构二胺，以提高韧性和断裂能，使 TDSE 的韧性和断裂能分别达到 82.38 MJ/m 和 43299 J/m，并具有 93%的自修复效率，自修复时间为 7 小时。利用 TDSE 和离子液体，构建了具有 50%循环拉伸时无拉伸敏感性的机械感觉能力的仿生力学稳定人工皮肤（BA-skin）。BA-skin 具有很高的生物力学稳定性，能够承受撕裂损伤，并且在脂肪酶溶液中具有良好的环境兼容性，可完全分解。这项工作为应用于仿生皮肤设备的高性能皮肤仿生弹性体提供了分子设计指导。
