Figure 4.

FT-IR spectra of KO-0 hydrogel, KO-1 hydrogel, KO-2 hydrogel and KO-3 hydrogel (a). The viscosity–shear rate curves (b), the viscoelasticity–angular frequency curves (c) and the viscoelasticity–shear stress curves (d) of KO-0, KO-1, KO-2 and KO-3 hydrogels.