writer：Hong Chen, Fengyu Yang, Qiang Chen*, and Jie Zheng*
keywords：Multi-mechanoresponsive
source：期刊
specific source：Advanced Materials
Issue time：2017年

A newly developed poly(AM-co-MA/SP) (polyacrylamide-co-methyl acrylate/spiropyran) hydrogel crosslinked by spiropyran (SP) mechanophore demonstrates its multi-stimuli-responsive and mechanically strong properties. The hydrogels not only exhibit thermo-, photo-, and mechano-induced color changes, but also achieve super-strong mechanical properties (tensile stress of 1.45 MPa, tensile strain of 600%, and fracture energy of 7300 J/m2). Due to a reversible structural transformation between spiropyran (SP, a ring-close) and merocyanine (MC, a ring-open) states, simple exposure of the hydrogels to white light can reverse color changes and restore mechanical

properties. The new design approach for a new mechanoresponsive hydrogel is easily transformative to the development of other mechanophore–based hydrogels for sensing, imaging, and display applications.