材料科学
氢键
聚氨酯
耐久性
极限抗拉强度
离子液体
弹性(材料科学)
复合材料
自愈
化学工程
复合数
作者
Xiao Wen,Junhuai Xu,Gongyan Liu,Zongliang Du,Shuang Wang,Xu Cheng
摘要
Hydrogel-based electronic skin sensors often suffer from low mechanical properties, poor durability, and low temperature resistance. Herein, an ionogel was fabricated by casting the water-borne polyurethane (WPU) and 1-ethyl-3-methylimidazoliumdicyanamide (EMIM:DCA). The imidazolidinyl urea with multiple hydrogen bonds as chain extenders was introduced into WPU systems. Owing to the multiple hydrogen bonds, the ionogels exhibited good mechanical properties with a tensile stress of 1.45–12.09 MPa, a strain of 730%–860%, and good resilience. Moreover, the mechanical properties, conductivity, and sensing ability of the ionogels could be conveniently healed with the assistance of heat. EMIM:DCA endowed the ionogels with excellent ionic conductivity at room temperature (1.8–246 μS cm−1). In addition, due to the low vapor pressure of EMIM:DCA, the ionogel exhibited excellent anti-freezing property at −20°C. The ionogel can be assembled into a sensor to monitor the movements of human body with good responsiveness and stability.
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