美国克拉克森大学Xiaocun Lu团队开发了一种具有力致近红外变色的机械磷交联聚合物。相关研究成果于2021年9月29日发表在《美国化学会杂志》。

该文开发了一种近红外（NIR）机械磷光体，并将其并入聚（丙烯酸甲酯）链中，以展示聚合物材料中的第一种力诱导近红外色度。这种基于苯并[1,3]恶嗪（OX）与七甲川菁部分融合的机械色体在溶液、薄膜和体状态下表现出近红外机械色性。使用UV–vis–NIR吸收/荧光光谱、凝胶渗透色谱（GPC）、NMR和DFT模拟验证了机械力化学活性。

研究表明，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相当大的潜力。

附：英文原文

Title: Force-Induced Near-Infrared Chromism of Mechanophore-Linked Polymers

Author: Qingkai Qi, Gaganjot Sekhon, Richard Chandradat, Nnamdi M. Ofodum, Tianruo Shen, Jan Scrimgeour, Monu Joy, Mario Wriedt, Madhuri Jayathirtha, Costel C. Darie, Devon A. Shipp, Xiaogang Liu, Xiaocun Lu

Issue&Volume: September 29, 2021

Abstract: 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.

DOI: 10.1021/jacs.1c05923

Source: https://pubs.acs.org/doi/10.1021/jacs.1c05923