School of Science and Engineering, The Chinese University of Hong Kong, Shenzhen, Shenzhen, 518172, China.
School of Mechanical Engineering, Chengdu Industry and Trade College, Chengdu, 611731, China.
Macromol Rapid Commun. 2022 Feb;43(4):e2100716. doi: 10.1002/marc.202100716. Epub 2022 Jan 17.
Stretchable materials, especially hydrogels, are emerging in various fields recently. Many applications demand low hysteresis and high fracture toughness of the materials to be used under dynamic mechanical loads. Herein, the authors report a hydrogel with high fracture toughness and low hysteresis through using a strong metal coordination bond and relatively high crosslinking density. This design allows the sacrificial bond to remain intact under normal operation, while fracturing to dissipate mechanical energy in the fracture zone to prevent propagation of the cracks. The obtained hydrogel exhibits a low hysteresis (≈1.5%) and a high fracture toughness (≈2,164 J m ). Moreover, the hydrogel possesses a high fatigue threshold of ≈141 J m and a reasonable conductivity. This study provides a worth-adopted approach to synthesize hydrogels with low hysteresis and high fracture toughness.
近年来，可拉伸材料，尤其是水凝胶，在各个领域崭露头角。许多应用要求材料在动态机械负载下具有低滞后和高断裂韧性。在此，作者通过使用强金属配位键和相对较高的交联密度，报告了一种具有高断裂韧性和低滞后的水凝胶。该设计允许在正常操作下保持牺牲键的完整性，而在断裂区断裂以耗散机械能，从而防止裂纹的扩展。所得到的水凝胶表现出低滞后（≈1.5%）和高断裂韧性（≈2164 J m）。此外，水凝胶具有高疲劳阈值（≈141 J m）和合理的电导率。本研究为合成具有低滞后和高断裂韧性的水凝胶提供了一种值得采用的方法。
