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Ionic Gels Based on Ionic Liquids and Diaryl Ethylene: Photochromic, Conductive, Self-Healing, and Flexible Sensing Properties
Author NameAffiliationE-mail
ZHU Si-Yu School of Chemistry and Material Engineering, Jiangnan University, Wuxi, Jiangsu 214122, China  
GAO Jie School of Chemistry and Material Engineering, Jiangnan University, Wuxi, Jiangsu 214122, China  
YAN Xiao-Dong School of Chemistry and Material Engineering, Jiangnan University, Wuxi, Jiangsu 214122, China  
GU Zhi-Guo School of Chemistry and Material Engineering, Jiangnan University, Wuxi, Jiangsu 214122, China
Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, Wuxi, Jiangsu 214122, China 		zhiguogu@jiangnan.edu.cn 
Abstract: It remains a challenge in the preparation of multifunctional conductive gels which combine self-healing and the ability to respond to complex environments. In this work, a new ionic self-healing gel DPZI with the properties of photochromic, conductive, self-adhesive, and wide temperature working range was prepared by polymerization of acrylic acid with the addition of 4,4'-(perfluorocyclopentene-1,2-diyl)bis(5-methylthiophene-2-carbaldehyde) (DEA) and 1-butyl-3-methylimidazolium tetrafluoroborate ((BMIm)BF4) ionic liquids. Owing to the high thermal stability and low vapor pressure of (BMIm)BF4, the obtained DPZI gel exhibited good mechanical properties in a wide temperature range from-20 to 40 ℃ and high ionic conductivity. The dynamic coordination bond formed by Zn2+ and—COO- introduced in the DPZI system enabled the gel to possess rapid self-healing ability and ultra-fast resistive response recovery in 0.06 s. The gel displayed excellent anti-freezing properties due to the combination of ionic liquids. DPZI exhibited a rapid reversible yellow-blue color transition within 10 s due to the isomerization of the photochromic unit DEA, and the open-loop form/closed-loop form isomerization of the photochromic unit also enabled the regulation of gel conductivity. Additionally, it showed good cycling stability with minor resistance fluctuations over 50 stretch-release cycles. Given its superior performance, the DPZI gel could effectively detect and distinguish human motions, such as the bending and stretching of a finger, knee, neck, or elbow joint, with a rapid and reliable signal response (strain sensitivity of 0.2%).
Keywords: gel  conductive  self-healing  photochromic  motion monitoring
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ZHU Si-Yu,GAO Jie,YAN Xiao-Dong,GU Zhi-Guo.Ionic Gels Based on Ionic Liquids and Diaryl Ethylene: Photochromic, Conductive, Self-Healing, and Flexible Sensing Properties[J].Chinese Journal of Inorganic Chemistry,2022,38(12):2363-2371.
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Chinese Journal of Inorganic Chemistry