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An unparalleled H-bonding and ion-bonding crosslinked waterborne polyurethane with super toughness and unprecedented fracture energy
Materials Horizons ( IF 13.3 ) Pub Date : 2021-08-31 , DOI: 10.1039/d1mh01217g
Yuan Yao 1 , Bo Liu 1 , Ziyang Xu 1 , Jianhai Yang 1 , Wenguang Liu 1
Affiliation  

Self-healing polyurethane elastomers have been extensively studied; however, developing an eco-friendly self-healable waterborne polyurethane (WPU) with exceptional mechanical properties remains a great challenge. Herein, we report healable, and highly tough WPU elastomers with unprecedented crack tolerance by introducing the concerted interactions of strong multiple H-bonds and ionic bonds in the network. The WPU elastomer demonstrated that the microphase separation structure contributes to an ultrahigh tensile strength (≈58 MPa), super toughness (≈456 MJ m−3), and unprecedented record fracture energy (≈320 kJ m−2). Due to the dynamic reconstruction of reversible H-bonds and ionic bonds, the WPU elastomer demonstrates a robust self-healability at 50 °C, allowing complete recovery of mechanical properties. Importantly, the thermoplasticity and reprocessability of WPUs enable direct 3D printing of different objects and electrospinning of tubes, showing great potential for expanding their application scope in soft robots and artificial stents.

中文翻译:

无与伦比的氢键和离子键交联水性聚氨酯,具有超强韧性和前所未有的断裂能

自修复聚氨酯弹性体已被广泛研究;然而,开发具有优异机械性能的环保型自修复水性聚氨酯 (WPU) 仍然是一个巨大的挑战。在此,我们通过在网络中引入强多个 H 键和离子键的协同相互作用,报告了具有前所未有的抗裂性的可愈合且高度坚韧的 WPU 弹性体。WPU 弹性体表明,微相分离结构有助于超高拉伸强度 (≈58 MPa)、超韧性 (≈456 MJ m -3 ) 和前所未有的破纪录断裂能 (≈320 kJ m -2)。由于可逆氢键和离子键的动态重建,WPU 弹性体在 50 °C 下表现出强大的自愈性,允许完全恢复机械性能。重要的是,WPU 的热塑性和可再加工性使不同物体的直接 3D 打印和管的静电纺丝成为可能,显示出扩大其在软机器人和人工支架中的应用范围的巨大潜力。
更新日期:2021-09-08
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