自愈水凝胶
材料科学
脱水
韧性
聚合物
相(物质)
化学工程
纳米技术
水溶液
超分子化学
高分子化学
化学
复合材料
有机化学
分子
生物化学
工程类
作者
Xin Xu,Yannick Eatmon,Kofi S. S. Christie,Allyson L. McGaughey,Néhémie Guillomaitre,Sujit S. Datta,Zhiyong Jason Ren,Craig B. Arnold,Rodney D. Priestley
出处
期刊:JACS Au
[American Chemical Society]
日期:2023-09-21
卷期号:3 (10): 2772-2779
标识
DOI:10.1021/jacsau.3c00326
摘要
Hydrogels are compelling materials for emerging applications including soft robotics and autonomous sensing. Mechanical stability over an extensive range of environmental conditions and considerations of sustainability, both environmentally benign processing and end-of-life use, are enduring challenges. To make progress on these challenges, we designed a dehydration-hydration approach to transform soft and weak hydrogels into tough and recyclable supramolecular phase-separated gels (PSGs) using water as the only solvent. The dehydration-hydration approach led to phase separation and the formation of domains consisting of strong polymer-polymer interactions that are critical for forming PSGs. The phase-separated segments acted as robust, physical cross-links to strengthen PSGs, which exhibited enhanced toughness and stretchability in its fully swollen state. PSGs are not prone to overswelling or severe shrinkage in wet conditions and show environmental tolerance in harsh conditions, e.g., solutions with pH between 1 and 14. Finally, we demonstrate the use of PSGs as strain sensors in air and aqueous environments.
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