| 基于离子液体和二芳基乙烯的离子凝胶的光致变色、导电、自修复及柔性传感性能 |
| Ionic Gels Based on Ionic Liquids and Diaryl Ethylene: Photochromic, Conductive, Self-Healing, and Flexible Sensing Properties |
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| 摘要: 在丙烯酸聚合中原位引入4，4'-(全氟环戊烯-1，2-二基)双(5-甲基噻吩-2-甲醛)(DEA)和离子液体1-丁基-3-甲基咪唑四氟硼酸盐((BMIm) BF4)，制备了一种同时具有光致变色、导电、自黏附且具有宽温度工作区间等性能的新型离子自修复凝胶DPZI。由于(BMIm) BF4的高热稳定性和低蒸气压，所获得的DPZI凝胶在-20~40℃较宽的温度下表现出高度稳定的机械和离子导电性能。DPZI系统中引入的Zn2+与—COO-形成动态配位键，使得凝胶具有快速的自修复能力，0.06 s即可超快恢复电阻响应；离子液体的引入同时赋予了凝胶优异的抗冻性。DPZI因光致变色单元DEA的异构化可在10 s内快速发生黄-蓝颜色可逆转变，且光致变色单元的开环/闭环异构化能够实现对凝胶导电性的调节。此外，DPZI凝胶应变/压力式传感器可迅速、精准感知人体不同部位的运动并做出相应的响应；也可对呼吸、心率、声音做出精准识别，应变灵敏度为0.2%。 |
| 关键词: 凝胶 导电 自修复 光致变色 运动监测 |
| 基金项目: 国家自然科学基金(No.22075108， 21905116)和江苏省自然科学基金(No.BK20190614)资助。 |
| 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 |
| 投稿时间：2022-06-20 修订日期：2022-10-06 |
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| 朱思宇,高洁,晏晓东,顾志国.基于离子液体和二芳基乙烯的离子凝胶的光致变色、导电、自修复及柔性传感性能[J].无机化学学报,2022,38(12):2363-2371. |
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| Support information: 相关附件： 220286_Supporting_Information.doc |
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