Mechanochromism and optical remodeling of multi-network elastomers containing anthracene dimers. Issue 36 (30th July 2019)

• Record Type: Journal Article
• Authors: Zhang, Huan; Zeng, Dezhi; Pan, Yifei; Chen, Yinjun; Ruan, Yonghong; Xu, Yuanze; Boulatov, Roman; Creton, Costantino; Weng, Wengui
• Is Part Of: Chemical science. Volume 10:Issue 36(2019)
• Page Start: 8367
• Page End: 8373
• Publication Date: 2019-07-30
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/c9sc02580d
• Languages: English
• ISSNs: 2041-6520

Abstract

Abstract : Multi-network elastomers with a reformable sacrificial network containing mechanochemically sensitive anthracene-dimer cross-links manifest reversible mechanochromism and remodeling. Abstract : 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.