Fig. 2.
Controlling the stiffness properties of hydrogels consisting of triggered constitutional dynamic networks. a Histograms and corresponding Gaussian fits of Young’s moduli associated with CDN hydrogels X, Y, and Z. b Young’s modulus changes of hydrogel X programmed by the concentrations of effector E1 or E2. Relative Yeff = (Yeff − Yeff(X))/Yeff(X) × 100%, where Yeff(X) represents Young’s modulus of hydrogel X without any triggers. c Scanning electron microscopy images of CDN hydrogels X, Y, and Z. d The concentrations of the constituents AA’, BB’, AB’, and BA’ in CDNs X, Y, and Z