An Adaptable Tough Elastomer with Moisture‐Triggered Switchable Mechanical and Fluorescent Properties
An Adaptable Tough Elastomer with Moisture‐Triggered Switchable Mechanical and Fluorescent Properties
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DOI：
10.1002/adfm.201903543
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发表时间：
2019-07
影响因子：
19
通讯作者：
Xing Zhou;Libing Wang;Zichao Wei;Gengsheng Weng;Jie He
中科院分区：
文献类型：
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作者：
Xing Zhou;Libing Wang;Zichao Wei;Gengsheng Weng;Jie He
受自然界启发，具有对外部刺激的耦合光学和机械响应性的智能材料对于下一代软机器和可穿戴电子产品的仿生设计很有意义。使用荧光镧系元素铕（Eu）设计了一种具有适应性和可切换机械和荧光特性的坚韧聚合物。引入动态的亚氨基二乙酸铕（IDA）配位以在由两个互穿网络组成的聚合物膜中建立物理交联网络。Eu-IDA络合的可逆破坏和重组通过动态配位的能量耗散赋予聚合物弹性体高刚度、韧性和拉伸性。与Eu 3+离子结合的水同时对含Eu聚合物弹性体的机械强度和荧光发射显示出有趣的影响。聚合物的机械状态，沿着通过聚合物膜的发射颜色变化的视觉光学响应，可以用水分作为刺激可逆地切换。在一个单一的材料的机械强度和发光颜色的耦合响应是潜在的适用于智能材料，需要其机械性能的光学读出。
Smart materials with coupled optical and mechanical responsiveness to external stimuli, as inspired by nature, are of interest for the biomimetic design of the next generation of soft machines and wearable electronics. A tough polymer that shows adaptable and switchable mechanical and fluorescent properties is designed using a fluorescent lanthanide, europium (Eu). The dynamic Eu‐iminodiacetate (IDA) coordination is incorporated to build up the physical cross‐linking network in the polymer film consisting of two interpenetrated networks. Reversible disruption and reformation of Eu‐IDA complexation endow high stiffness, toughness, and stretchability to the polymer elastomer through energy dissipation of dynamic coordination. Water that binds to Eu3+ ions shows an interesting impact simultaneously on the mechanical strength and fluorescent emission of the Eu‐containing polymer elastomer. The mechanical states of the polymer, along with the visually optical response through the emission color change of the polymer film, are reversibly switchable with moisture as a stimulus. The coupled response in the mechanical strength and emissive color in one single material is potentially applicable for smart materials requiring an optical readout of their mechanical properties.