Anisotropically Fatigue-Resistant Hydrogels
Anisotropically Fatigue-Resistant Hydrogels
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DOI：
10.1002/adma.202102011
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发表时间：
2021-06-10
影响因子：
29.4
通讯作者：
Liu, Ji
中科院分区：
文献类型：
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作者：
Liang, Xiangyu;Chen, Guangda;Liu, Ji
然而，大自然利用有限的成分构建生物材料，通过利用跨多个长度尺度的固有结构，与人造材料相比，具有无与伦比的机械性能。相比之下，合成材料的设计主要集中在开发新化合物上，而不能再现天然材料的机械性能，比如抗疲劳性能。本文报道了一种简单而通用的设计策略，可以使常规水凝胶的疲劳阈值提高100倍以上。这一策略已被证明普遍适用于各种水凝胶材料，包括多糖（即海藻酸盐、纤维素）、蛋白质（即明胶）、合成聚合物（即聚乙烯醇）以及相应的聚合物复合材料。与大多数合成软材料相比，这些抗疲劳水凝胶表现出创纪录的高疲劳阈值，使其成为机器人、人造肌肉等软材料的低成本、高性能和耐用替代品。
Nature builds biological materials from limited ingredients, however, with unparalleled mechanical performances compared to artificial materials, by harnessing inherent structures across multi-length-scales. In contrast, synthetic material design overwhelmingly focuses on developing new compounds, and fails to reproduce the mechanical properties of natural counterparts, such as fatigue resistance. Here, a simple yet general strategy to engineer conventional hydrogels with a more than 100-fold increase in fatigue thresholds is reported. This strategy is proven to be universally applicable to various species of hydrogel materials, including polysaccharides (i.e., alginate, cellulose), proteins (i.e., gelatin), synthetic polymers (i.e., poly(vinyl alcohol)s), as well as corresponding polymer composites. These fatigue-resistant hydrogels exhibit a record-high fatigue threshold over most synthetic soft materials, making them low-cost, high-performance, and durable alternatives to soft materials used in those circumstances including robotics, artificial muscles, etc.