期刊
CCS CHEMISTRY
卷 -, 期 -, 页码 -出版社
CHINESE CHEMICAL SOC
DOI: 10.31635/ccschem.022.202201874
关键词
diselenide; mechano-responsive polymers; self-strengthening; polymer mechanochemistry; stress sensing
资金
- National Natural Science Foundation of China [21734006, 21975178]
- National Key Research and Development Program of China [2017YFA0207800, 2017YFA0204503]
In this study, a new type of elastomer material is reported, which converts destructive forces into productive reactions by using diselenide as a mechanophore. By incorporating labile Se-Se bonds into polyurethane, radical transfer and cross-linking reactions can be activated under mechanical compression, leading to enhanced mechanical and fluorescence properties of the material.
Unlike biological materials that can sense mechanical force and actively remodel locally, synthetic polymers typically break down under stress. Molecular-level responses to damage with both stress-reporting and self-strengthening functions are significant yet difficult to realize for synthetic polymers. To overcome this challenge, chemo-mechanical coupling into polymers that can simultaneously ameliorate mechanical, optical, or other functional properties of a polymer combined with mechanical treatment will offer a new principle for materials design. Here, we report a kind of elastomer in which destructive forces are channelled into productive and bond-forming reactions by using diselenide (Se-Se) as a mechanophore. Polyurethane has been functionalized with labile Se-Se bonds, whose mechanical activation generates seleno radicals that trigger radical transfer and cross-linking reactions in situ. These reactions are activated efficiently in a mechanical way by compression in bulk materials. The resulting covalent networks possess turn-on mechano-fluorescence and increased moduli, which provide the functions of stress reporting, mechano-healing, and mechano-remodeling for the deformed film. This study not only illuminates the mechano-responsive nature of Se-Se bonds in the bulk state but also paves the way for the development of new stress-responsive materials. [GRAPHICS]
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