Thermally Stable Radical-Type Mechanochromic Polymers Based on Difluorenylsuccinonitrile
Thermally Stable Radical-Type Mechanochromic Polymers Based on Difluorenylsuccinonitrile
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DOI：
10.1021/acsmacrolett.8b00755
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发表时间：
2018-11-01
影响因子：
7.015
通讯作者：
Otsuka, Hideyuki
中科院分区：
文献类型：
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作者：
Sakai, Hio;Sumi, Toshikazu;Otsuka, Hideyuki
机械变色是一种由机械力引起的颜色变化，在材料科学领域引起了广泛关注，因为它可用于创建应力和损伤检测传感器。特别是，自由基型机械致色分子（机械发色团）在受到机械力作用时会产生有色自由基，可以对机械应力进行定性可视化，并通过电子顺磁共振波谱对产生的自由基物质进行定量评估。然而，自由基型力力发色团对热刺激的敏感性限制了它们的应用范围。在此，我们报道了自由基型机械发色团二芴基丁二腈（DFSN），由于其中心碳-碳键表现出较高的热稳定性，因此可用于通过活性自由基聚合技术合成机械致色聚合物。获得的以 DFSN 为中心的聚合物表现出机械致变色性和理想的高耐热性。
Mechanochromism, a color change induced by mechanical force, has attracted much attention in materials science, as it can be used to create stress- and damage-detecting sensors. In particular, radical-type mechanochromic molecules (mechanochromophores), which produce colored radicals upon exposure to mechanical force, enable the qualitative visualization of mechanical stress and the quantitative evaluation of the generated radical species by electron paramagnetic resonance spectroscopy. However, the sensitivity of radical-type mechanochromophores to thermal stimuli limits their range of applications. Herein, we report the radical-type mechanochromophore difluorenylsuccinonitrile (DFSN), which can be used to synthesize mechanochromic polymers via living radical polymerization techniques, as its central carbon-carbon bond exhibits high thermal stability. The obtained DFSN-centered polymers show mechanochromism and desirably high thermal resistance.