自愈水凝胶
微尺度化学
磁滞
材料科学
相(物质)
极限抗拉强度
丙烯酸酯
复合材料
压力(语言学)
化学工程
高分子化学
化学
聚合物
共聚物
语言学
数学教育
数学
物理
有机化学
哲学
量子力学
工程类
作者
Guogao Zhang,Jason Steck,Junsoo Kim,Christine Heera Ahn,Zhigang Suo
出处
期刊:Science Advances
[American Association for the Advancement of Science (AAAS)]
日期:2023-06-30
卷期号:9 (26)
被引量:20
标识
DOI:10.1126/sciadv.adh7742
摘要
Hydrogels are being developed to bear loads. Applications include artificial tendons and muscles, which require high strength to bear loads and low hysteresis to reduce energy loss. However, simultaneously achieving high strength and low hysteresis has been challenging. This challenge is met here by synthesizing hydrogels of arrested phase separation. Such a hydrogel has interpenetrating hydrophilic and hydrophobic networks, which separate into a water-rich phase and a water-poor phase. The two phases arrest at the microscale. The soft hydrophilic phase deconcentrates stress in the strong hydrophobic phase, leading to high strength. The two phases are elastic and adhere through topological entanglements, leading to low hysteresis. For example, a hydrogel of 76 weight % water, made of poly(ethyl acrylate) and poly(acrylic acid), achieves a tensile strength of 6.9 megapascals and a hysteresis of 16.6%. This combination of properties has not been realized among previously existing hydrogels.
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