Kato Sota, Ishizuki Kuniaki, Aoki Daisuke, Goseki Raita, Otsuka Hideyuki
Department of Chemical Science and Engineering, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8550, Japan.
ACS Macro Lett. 2018 Sep 18;7(9):1087-1091. doi: 10.1021/acsmacrolett.8b00521. Epub 2018 Aug 28.
Mechanochromism can be triggered by different mechanical stimuli, such as tension, compression, shearing, and sonication. Freezing a polymer gel also induces mechanical stress on the polymer network. Herein, freezing-induced mechanoluminescence is demonstrated for the first time by introduction of a tetraarylsuccinonitrile moiety as a light-emitting mechanochromophore at the cross-linking points of a polymer network, in which the mechanical stress induces not only a color change but also light emission. The detailed mechanism and characteristics of this freezing-induced mechanoluminescence were quantitatively evaluated by electron paramagnetic resonance spectroscopy.
机械变色可由不同的机械刺激引发，如拉伸、压缩、剪切和超声处理。冷冻聚合物凝胶也会在聚合物网络上诱导机械应力。在此，通过在聚合物网络的交联点引入四芳基琥珀腈部分作为发光机械变色团，首次证明了冷冻诱导的机械发光，其中机械应力不仅会引起颜色变化，还会导致发光。通过电子顺磁共振光谱对这种冷冻诱导机械发光的详细机制和特性进行了定量评估。
