Force-Induced Near-Infrared Chromism of Mechanophore-Linked Polymers
Force-Induced Near-Infrared Chromism of Mechanophore-Linked Polymers
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DOI：
10.1021/jacs.1c05923
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发表时间：
2021-09-29
影响因子：
15
通讯作者：
Lu, Xiaocun
中科院分区：
文献类型：
--
作者：
Qi, Qingkai;Sekhon, Gaganjot;Lu, Xiaocun
开发了一种近红外 (NIR) 机械载体，并将其整合到聚丙烯酸甲酯链中，以展示聚合物材料中第一个力诱导的 NIR 变色现象。这种机械基团基于与七次甲基花青部分融合的苯并[1,3]恶嗪（OX），在溶液、薄膜和本体状态下表现出近红外机械致变色现象。使用紫外-可见-近红外吸收/荧光光谱、凝胶渗透色谱 (GPC)、NMR 和 DFT 模拟来验证机械化学活性。我们的工作表明，近红外力致变色聚合物在机械力传感、损伤检测、生物成像和生物力学方面具有巨大的潜力。
A near-infrared (NIR) mechanophore was developed and incorporated into a poly(methyl acrylate) chain to showcase the first force-induced NIR chromism in polymeric materials. This mechanophore, based on benzo[1,3]oxazine (OX) fused with a heptamethine cyanine moiety, exhibited NIR mechanochromism in solution, thin-film, and bulk states. The mechanochemical activity was validated using UV-vis- NIR absorption/fluorescence spectroscopies, gel permeation chromatography (GPC), NMR, and DFT simulations. Our work demonstrates that NIR mechanochromic polymers have considerable potential in mechanical force sensing, damage detection, bioimaging, and biomechanics.