Department of Chemical Engineering, Stanford University, 443 Via Ortega, Stanford, CA, 94305, USA.
Biomedical Research Institute, Korea Institute of Science and Technology, 5 Hwarang-ro 14-gil, Seongbuk-gu, Seoul, 02791, South Korea.
Adv Mater. 2018 Mar;30(13):e1706846. doi: 10.1002/adma.201706846. Epub 2018 Feb 9.
An electronic (e-) skin is expected to experience significant wear and tear over time. Therefore, self-healing stretchable materials that are simultaneously soft and with high fracture energy, that is high tolerance of damage or small cracks without propagating, are essential requirements for the realization of robust e-skin. However, previously reported elastomers and especially self-healing polymers are mostly viscoelastic and lack high mechanical toughness. Here, a new class of polymeric material crosslinked through rationally designed multistrength hydrogen bonding interactions is reported. The resultant supramolecular network in polymer film realizes exceptional mechanical properties such as notch-insensitive high stretchability (1200%), high toughness of 12 000 J m , and autonomous self-healing even in artificial sweat. The tough self-healing materials enable the wafer-scale fabrication of robust and stretchable self-healing e-skin devices, which will provide new directions for future soft robotics and skin prosthetics.
电子皮肤预计会随着时间的推移而经历显著的磨损。因此，自我修复的弹性材料，同时具有柔软性和高断裂能，即对损伤或小裂纹具有高容忍度而不会扩展，是实现稳健的电子皮肤的基本要求。然而，以前报道的弹性体，特别是自我修复聚合物，大多是粘弹性的，缺乏高机械韧性。在这里，报道了一类通过合理设计的多强度氢键相互作用交联的新型聚合物材料。聚合物薄膜中的所得超分子网络实现了优异的机械性能，如无缺口高拉伸性（1200%）、12000J m 的高韧性和即使在人工汗水中也能自动自我修复。坚韧的自修复材料使晶圆级制造坚固和可拉伸的自修复电子皮肤设备成为可能，这将为未来的软机器人和皮肤假体提供新的方向。
