Junqiang Justin Koh, Xuan Zhang, Shaohua Ling, Ximeng Liu, Lili Zhou, Zhi Qiao, Yu Jun Tan
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Consisting of a mixture of poly(propylene glycol) (PPG) with urea linkages (PPGurea) and ionic liquid [EMIM][TFSI], the transition is attributed to a series of synergetic interactions among various chemical components and groups, including ether-cation coordination, water-anion complex, urea-urea bidentate hydrogen bonds, and cation–anion electrostatic interactions. In the hydrated state, with a very small amount (4–5 wt%) of spontaneously absorbed moisture content, the smart material is soft, transparent, and conductive, and possesses rapid self-healing ability. Upon dehydration, the material transits into a phase-separated system with PPG-rich and IL-rich phases, resulting in opacity, severely reduced ionic conductivity, yet significantly enhanced stiffness, strength, and toughness. 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引用次数: 0
摘要
能够根据环境变化改变自身功能的智能响应材料因其在智能设备和产品中的潜在应用而备受青睐。在这里,我们创造了一种在湿度或温度变化时多种特性发生可逆变化的智能材料。这种材料会根据周围湿度或温度的波动自发地在水合态和脱水态之间转换。这种材料由具有脲键的聚丙二醇(PPG)和离子液体[EMIM][TFSI]的混合物组成,其转变归因于各种化学成分和基团之间的一系列协同作用,包括醚阳离子配位、水阴离子复合物、脲双叉氢键和阳离子静电作用。在水合状态下,自发吸收的水分含量极少(4-5 wt%),智能材料柔软、透明、导电,并具有快速自我修复能力。脱水后,材料转变为富含 PPG 相和富含 IL 相的相分离体系,导致不透明、离子导电性严重降低,但硬度、强度和韧性显著增强。多种性能的急剧变化使其成为一种智能材料,非常适合用于各种智能应用,如传感器、3D 打印光电元件和智能窗户,它们可以自动改变功能以适应环境变化。
A Smart Self-Healing Material with Reversible Optical, Mechanical, and Electrical Transition Induced by Humidity and Temperature
Smart responsive materials that can alter their function in response to environmental changes are attractive for their potential applications in intelligent devices and products. Herein, a smart material that exhibits reversible changes in multiple properties upon variations in humidity or temperature is created. The material spontaneously transits between hydrated and dehydrated states in response to fluctuations in the surrounding humidity or temperature. Consisting of a mixture of poly(propylene glycol) (PPG) with urea linkages (PPGurea) and ionic liquid [EMIM][TFSI], the transition is attributed to a series of synergetic interactions among various chemical components and groups, including ether-cation coordination, water-anion complex, urea-urea bidentate hydrogen bonds, and cation–anion electrostatic interactions. In the hydrated state, with a very small amount (4–5 wt%) of spontaneously absorbed moisture content, the smart material is soft, transparent, and conductive, and possesses rapid self-healing ability. Upon dehydration, the material transits into a phase-separated system with PPG-rich and IL-rich phases, resulting in opacity, severely reduced ionic conductivity, yet significantly enhanced stiffness, strength, and toughness. The drastic change in multiple properties makes it an intelligent material well-suited for various smart applications such as sensors, 3D printed optoelectronics and smart windows, which can automatically alter their functions to adapt to environmental changes.
期刊介绍:
Advanced Materials Technologies Advanced Materials Technologies is the new home for all technology-related materials applications research, with particular focus on advanced device design, fabrication and integration, as well as new technologies based on novel materials. It bridges the gap between fundamental laboratory research and industry.