材料科学
离子键合
自愈水凝胶
丝绸
复合数
复合材料
离子电导率
离子强度
化学工程
纳米技术
高分子化学
离子
电解质
化学
水溶液
电极
有机化学
物理化学
工程类
作者
Feifei Wang,Zhen Li,Jianqiang Guo,Lin Liu,Hao Fu,Juming Yao,Izabella Krucińska,Zbigniew Draczyński
出处
期刊:ACS applied polymer materials
[American Chemical Society]
日期:2021-12-24
卷期号:4 (1): 618-626
被引量:28
标识
DOI:10.1021/acsapm.1c01553
摘要
The development of hydrogel-based electronic sensors integrated with excellent mechanical performance, conductivity, high sensitivity, and stability is still a great challenge. In this work, a highly strong, tough, and stretchable conductive hydrogel was proposed using silk sericin (SS), polyvinyl alcohol (PVA), and sodium citrate (Na3Cit) via combining freeze–thaw with the salting-out route. SS with rich-binding sites (−COO–, −NH2, and −OH) was exploited to construct an ionic conductive hydrogel with multiple physical interactions containing hydrogen bonds, ionic coordinations, and hydrophobic interactions. The obtained composite hydrogels (PVA/SS/Na3Cit) displayed a prominent tensile strength of 4.42 ± 0.32 MPa, an elastic modulus of 3.14 ± 0.26 MPa, a toughness of 13.73 ± 1.05 MJ/m3, and an excellent stretchability (>500% of strain) and self-recovery. In addition, the introduction of SS not only mediated the noncovalent cross-link network but also enabled excellent ionic conductivity of the hydrogels due to the coordination effect of Na+ and Cit3– ions. Moreover, the PVA/SS/Na3Cit conductive hydrogels can be used as a strain sensor to monitor human activities, and they exhibit a wide work range, good sensitivity, and stability, suggesting promising applications in flexible and stretchable wearable electronics.
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