Visualization and Quantitative Evaluation of Toughening Polymer Networks by a Sacrificial Dynamic Cross-Linker with Mechanochromic Properties,ACS Macro Letters

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Visualization and Quantitative Evaluation of Toughening Polymer Networks by a Sacrificial Dynamic Cross-Linker with Mechanochromic Properties
ACS Macro Letters ( IF 5.1 ) Pub Date : 2020-07-21 , DOI: 10.1021/acsmacrolett.0c00321
Hio Sakai ₁ , Daisuke Aoki ₁ , Kota Seshimo ₁ , Koichi Mayumi ₂ , Shotaro Nishitsuji ₃ , Takashi Kurose ₄ , Hiroshi Ito _{3,

4} , Hideyuki Otsuka ₁

Affiliation

A difluorenylsuccinonitrile-(DFSN)-based linker, whose central C–C bond is readily cleaved under mechanical stress to generate a relatively stable pink radical species, was introduced into polymer networks. DFSN-based cross-linked polymers exhibit improved mechanical properties as compared to those of the corresponding covalently cross-linked polymers owing to the energy dissipation induced by cleavage of the central DFSN bond. The toughening mechanism of DFSN-based elastomers is qualitatively visualized by the intensity of the pink color and can be quantitatively characterized by electron paramagnetic resonance. These results demonstrate that the extent of DFSN cleavage is the main factor improving the mechanical properties of the polymer networks.

中文翻译：

具有机械变色特性的牺牲动态交联剂对增韧聚合物网络的可视化和定量评估

将一种基于二芴基丁二腈 (DFSN) 的接头引入聚合物网络中，该接头的中心 C-C 键在机械应力下很容易断裂以产生相对稳定的粉红色自由基物种。与相应的共价交联聚合物相比，基于 DFSN 的交联聚合物表现出改进的机械性能，这是由于中心 DFSN 键的断裂引起的能量耗散。基于 DFSN 的弹性体的增韧机制通过粉红色的强度进行定性可视化，并且可以通过电子顺磁共振进行定量表征。这些结果表明，DFSN裂解的程度是提高聚合物网络力学性能的主要因素。

更新日期：2020-08-18

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