羧甲基纤维素
自愈水凝胶
明胶
极限抗拉强度
复合材料
抗压强度
聚合物
化学
化学工程
钠
高分子化学
材料科学
有机化学
工程类
冶金
作者
Xuzhe Qin,Zhijie Zhao,Jing Deng,Yijie Zhao,S.H. Liang,Yongxiang Yi,Junjie Li,Yuping Wei
标识
DOI:10.1016/j.carbpol.2024.121920
摘要
Natural polymer-based hydrogels have been wildly used in electronic skin, health monitoring and human motion sensing. However, the construction of hydrogel with excellent mechanical strength and electrical conductivity totally using natural polymers still faces many challenges. In this paper, gelatin and oxidized sodium carboxymethylcellulose were used to synthesize a double-network hydrogel through the dynamic Schiff base bonds. Then, the mechanical strength of the hydrogel was further enhanced by immersing it in an ammonium sulfate solution based on the Hofmeister effect between gelatin and salt. Finally, the gelatin/oxidized sodium carboxymethylcellulose hydrogel exhibited high tensile properties (614 %), tensile fracture strength (2.6 MPa), excellent compressive fracture strength (64 MPa), and compressive toughness (4.28 MJ/m3). Also, the electrical conductivity reached 3.94 S/m. The hydrogel after salt soaked was fabricated as strain sensors, which could accurately monitor the movement of many joints in the human body, such as fingers, wrists, elbows, neck, and throat. Therefore, the designed hydrogel fully originated from natural polymers and has great application potential in motion detection and information recording.
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