羧甲基纤维素
材料科学
韧性
自愈水凝胶
复合材料
聚丙烯酰胺
拉伤
极限抗拉强度
纤维素
标度系数
化学工程
高分子化学
制作
冶金
替代医学
钠
病理
工程类
内科学
医学
作者
Haitao Zhang,Xiaojun Wu,Zhihui Qin,Xia Sun,Hong Zhang,Qingyu Yu,Mengmeng Yao,Shaoshuai He,Xiaoru Dong,Fanglian Yao,Junjie Li
出处
期刊:Cellulose
[Springer Nature]
日期:2020-09-19
卷期号:27 (17): 9975-9989
被引量:61
标识
DOI:10.1007/s10570-020-03463-5
摘要
Hydrogel-based strain sensors have been widely investigated owing to their intrinsic flexible and extensible properties. However, integrating good mechanical properties and excellent strain sensitivity into one hydrogel remains a challenge. In this work, a dual physical cross-linked carboxymethyl cellulose-Fe3+/polyacrylamide (CMC-Fe3+/PAAm) double network hydrogel was developed by facile two-step method. In this hydrogel, the Fe3+ cross-linked CMC acts as the first network for dissipating energy and hydrophobic association PAAm acts as the second network to maintain the integrity of hydrogel. Owing to these physical interactions, the as-prepared hydrogel shows good mechanical properties (e.g., tensile strength, 1.82 MPa; toughness, 6.52 MJ/m3). Furthermore, these mechanical behaviors can be modulated by adjusting the solid content, CMC/PAAm ratio, Fe3+ concentration and soaking time in Fe3+ solution. Moreover, the obtained hydrogel shows excellent self-recovery and anti-fatigue property due to the reversibility of dual physical cross-linked interactions. Additionally, the CMC-Fe3+/PAAm hydrogel shows good conductivity (1.82 S/m), strain sensitivity (gauge factor = 4.02 at 50–600% strain), and fast response time (260 ms). Based on the high strain sensitivity, the CMC-Fe3+/PAAm hydrogel can fabricate a flexible strain sensor for precisely monitoring various human motions. This study suggests that the CMC-Fe3+/PAAm hydrogel exhibits potential application in the flexible and stretchable strain sensors.
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