自愈水凝胶
材料科学
聚合物
化学工程
相(物质)
韧性
磁选
降水
水溶液
高分子化学
复合材料
化学
有机化学
气象学
冶金
工程类
物理
作者
Jingda Tang,Chenghai Li,Haomin Li,Zengyao Lv,Hao Sheng,Tongqing Lu,T. J. Wang
摘要
Phase separation markedly influences the physical properties of hydrogels. Here, we find that poly (N, N-dimethylacrylamide) (PDMA) hydrogels suffer from phase separation in aqueous sodium hydroxide solutions when the concentration is higher than 2 M. The polymer volume fraction and mechanical properties show an abrupt change around the transition point. We utilize this phase separation mechanism to synthesize tough magnetic PDMA hydrogels with the in-situ precipitation method. For comparison, we also prepared magnetic poly (2-acrylamido-2-methyl-propane sulfonic acid sodium) (PNaAMPS) magnetic hydrogels, where no phase separation occurs. The phase-separated magnetic PDMA hydrogels exhibit an extraordinarily high toughness of ∼1000 J m−2; while non-phase-separated magnetic PNaAMPS hydrogels only show a toughness of ∼1 J m−2, three orders of magnitude lower than that of PDMA hydrogels. This phase separation mechanism may become a new approach to prepare tough magnetic hydrogels and inspire more applications.
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