自愈水凝胶
材料科学
导电体
纳米技术
化学工程
高分子化学
复合材料
工程类
作者
Wei Yuan,Dingli Gan,Siying Wang,Qian Wang,Wenjun Wang,Chencheng Sun,Xiaochen Dong
标识
DOI:10.1016/j.cej.2022.137675
摘要
• A strategy for the rapid synthesis of hydrogels based on POM is proposed. • The strategy can simultaneously improve the mechanical and electrical properties. • The hydrogel has high transparency and can be used in coatings and flexible sensors. Hydrogels have been widely explored as flexible electronics in the fields of electronic skin, implantable devices, human–computer interaction systems, and soft robots. However, the commonly used heat- or light-induced hydrogel polymerization strategies cannot meet the critical demands for rapid preparation. Herein, a redox system assembled by Mo 2 C-derived polyoxometalates (POM) and ammonium persulfate (APS) for the rapid polymerization (10 s) of high elasticity (1918%), transparency (95%), and conductivity (15 S/m) hydrogels were proposed. The free radicals could rapidly generate from the redox initiator at room temperature without external stimuli of light and heat. By adjusting the amount of POM and APS, the reaction rate can be precisely adjusted from a few hours to seconds to realize the rapid synthesis of high-performance hydrogels. In addition, the POM also could serve as the crosslinking agent to enhance the mechanical properties of the hydrogels. Moreover, the fabricated flexible sensors exhibited highly sensitive electromechanical perception, rapid response, and ultrahigh stability to monitoring different human motions. This strategy paves the way for hydrogel coating, rapid in-situ adhesion, crack repair, and flexible sensors at a low cost.
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