Miao Haiyue, Hao Weiju, Liu Hongtao, Liu Yiyang, Fu Xiaobin, Huang Hailong, Ge Min, Qian Yuan
School of Materials and Chemistry, University of Shanghai for Science and Technology, No. 516 Jungong Road, Shanghai 200093, China.
Key Laboratory of Interfacial Physics and Technology, Department of Molten Salt Chemistry and Engineering, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China.
Gels. 2022 Jan 31;8(2):89. doi: 10.3390/gels8020089.
Based on the good self-healing ability to repair mechanical damage, self-healing hydrogels have aroused great interest and been extensively applied as functional materials. However, when partial failure of hydrogels caused by breaking or dryness occurs, leading to recycling problems, self-healing hydrogels cannot solve the mentioned defects and have to be abandoned. In this work, a novel recyclable and self-healing natural polymer hydrogel (Chitosan/polymethylacrylic acid-: CMA) was prepared. The CMA hydrogel not only exhibited controlled mechanical properties from 26 kPa to 125 kPa with tensile strain from 1357% to 3012%, but also had good water retaining property, stability and fast self-healing properties in 1 min. More importantly, the CMA hydrogel displayed attractive powder self-healing performance. After drying-powdering treatment, the mentioned abandoned hydrogels could easily rebuild their frame structure to recover their original state and performance in 1 min only by adding a small amount of water, which could significantly prolong their service life. These advantages guarantee the hydrogel can effectively defend against reversible mechanical damage, water loss and partial hydrogel failure, suggesting great potential applications as a recyclable functional hydrogel for biomaterials and electronic materials.
基于良好的自修复能力来修复机械损伤，自修复水凝胶引起了极大的兴趣，并作为功能材料得到了广泛应用。然而，当水凝胶因破裂或干燥而出现部分失效，导致回收利用问题时，自修复水凝胶无法解决上述缺陷，不得不被废弃。在这项工作中，制备了一种新型的可回收且自修复的天然聚合物水凝胶（壳聚糖/聚甲基丙烯酸：CMA）。CMA水凝胶不仅表现出从26 kPa到125 kPa的可控机械性能，拉伸应变从1357%到3012%，而且具有良好的保水性能、稳定性以及在1分钟内快速自修复的性能。更重要的是，CMA水凝胶展现出引人注目的粉末自修复性能。经过干燥-粉末化处理后，上述废弃的水凝胶只需加入少量水，就能在1分钟内轻松重建其框架结构，恢复其原始状态和性能，这可以显著延长它们的使用寿命。这些优点保证了该水凝胶能够有效抵御可逆的机械损伤、水分流失和部分水凝胶失效，表明其作为一种可回收的功能水凝胶在生物材料和电子材料方面具有巨大的潜在应用价值。
