材料科学
乙烯醇
自愈水凝胶
生物相容性
制作
韧性
极限抗拉强度
复合材料
导电体
纳米技术
聚合物
化学工程
高分子化学
冶金
病理
替代医学
工程类
医学
作者
Shuwang Wu,Yousif Alsaid,Bowen Yao,Yichen Yan,Yusen Zhao,Mutian Hua,Dong Wu,Xinyuan Zhu,Ximin He
出处
期刊:EcoMat
[Wiley]
日期:2021-02-14
卷期号:3 (2)
被引量:27
摘要
Abstract With the emergence of soft electronic devices, the requirements for conductive soft materials are unprecedentedly high. Among various soft materials, hydrogels are gaining tremendous attention for their superior softness, wetness, responsiveness, and biocompatibility. However, hydrogels inevitably lose elasticity and ionic conductivity at subzero temperature because of water freezing in the polymer matrices, severely limiting applications at low temperatures. Herein, we propose a rapid fabrication strategy to produce anti‐freezing conductive gels with poly(vinyl alcohol) on a large scale within minutes (vs hours/days in conventional methods) using a water/DMSO binary liquid system, which serves as gelation inducer via cononsolvency and anti‐freezing solvents simultaneously. The gel with 60 wt% DMSO shows the best anti‐freezing performance, remaining unfrozen at temperatures lower than −50°C, while also maintaining the highest mechanical properties with a tensile strength of 1.1 MPa, toughness of 10.9 MJ/m 3 , and elongation of 1500% outperforming the most previous reports. After incorporating H 2 SO 4 , the gels exhibit a high ionic conductivity of 5.25 S/m and maintain 1.65 S/m even at −50°C. Furthermore, an all‐in‐one supercapacitor is fabricated to demonstrate the potential of the anti‐freezing gel in soft device applications with good performance at subzero temperatures. A full recyclability of the material was also demonstrated. image
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