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(a) Fluorescent images of poly(AAm-co-MA/Rh) hydrogel with a solid content of 70 wt% at both stretched state and the corresponding relaxed state. Emission spectra of the hydrogel with a solid content of (b) 50 wt%, (c) 60 wt%, and (d) 70 wt% recorded at increasing strain levels during uniaxial stretching. (e) Stress and fluorescence-intensity ratio I600/I440 as a function of stretch ratio for the hydrogel with a solid content of 70 wt%.
