期刊
CHEMICAL SCIENCE
卷 10, 期 36, 页码 8367-8373出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9sc02580d
关键词
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资金
- National Natural Science Foundation of China (NNSFC) [21574108, 21774106]
- UK Engineering and Physical Sciences Research Council (EPSRC) [EP/L000075/1]
- European Research Council (ERC) under the European Union [695351]
- European Research Council (ERC) [695351] Funding Source: European Research Council (ERC)
- EPSRC [EP/L000075/1] Funding Source: UKRI
Multi-network elastomers are both stiff and tough by virtue of containing a pre-stretched stiff network that can rupture and dissipate energy under load. However, the rupture of this sacrificial network in all described covalent multi-network elastomers is irreversible. Herein, we describe the first example of multi-network elastomers with a reformable sacrificial network containing mechanochemically sensitive anthracene-dimer cross-links. These cross-links also make our elastomers mechanochromic, with coloration that is both persistent and reversible, because the fluorogenic moiety (anthracene dimer) is regenerated upon irradiation of the material. In proof-of-concept experiments we demonstrate the utility of incorporating anthracene dimers in the backbone of the sacrificial network for monitoring mechanochemical remodeling of multi-network elastomers under cycling mechanical load. Stretching or compressing these elastomers makes them fluorescent and irradiating them eliminates the fluorescence by regenerating anthracene dimers. Reformable mechanochromic cross-links, exemplified by anthracene dimers, hold potential for enabling detailed studies of the molecular origin of the unique mechanical properties of multi-network elastomers.
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