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

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...

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Bibliographic Details
Published in:ACS macro letters 2020-08, Vol.9 (8), p.1108-1113
Main Authors: Sakai, Hio, Aoki, Daisuke, Seshimo, Kota, Mayumi, Koichi, Nishitsuji, Shotaro, Kurose, Takashi, Ito, Hiroshi, Otsuka, Hideyuki
Format: Article
Language:English
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Summary: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.
ISSN:2161-1653
2161-1653
DOI:10.1021/acsmacrolett.0c00321