材料科学
自愈水凝胶
纳米技术
复合材料
拉伤
高分子化学
医学
内科学
作者
Huijun Li,Han Zheng,Yu Tan,Shu Beng Tor,Kun Zhou
标识
DOI:10.1021/acsami.0c19104
摘要
The weak mechanical properties of hydrogels due to the inefficient dissipation of energy in the intrinsic structures limit their practical applications. Here, a double-network (DN) hydrogel has been developed by integrating an ionically cross-linked agar network, a covalently cross-linked acrylic acid (AAC) network, and the dynamic and reversible ionically cross-linked coordination between the AAC chains and Fe3+ ions. The proposed model reveals the mechanisms of the improved mechanical performances in the DN agar/AAC–Fe3+ hydrogel. The hydrogen-bond cross-linked double helices of agar and ionic-coordination interactions of AAC–Fe3+ can be temporarily sacrificed during large deformation to readily dissipate the energy, whereas the reversible AAC–Fe3+ interactions can be regenerated after stress relief, which greatly increases the material toughness. The developed DN hydrogel demonstrates a remarkable stretchability with a break strain up to 3174.3%, high strain sensitivity with the gauge factor being 0.83 under a strain of 1000%, and good 3D printability, making the material a desirable candidate for fabricating flexible strain sensors, electronic skin, and soft robots.
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