Fig. 4.

Characterization of the composite bilayer SilMA hydrogels. SEM images of the S ​+ ​B hydrogel (A–C), S ​+ ​K hydrogel (D–F) and S ​+ ​B ​+ ​K ​+ ​P hydrogel (G–I). Cumulative BBR release from SilMA ​+ ​BBR and SilMA ​+ ​BBRms hydrogels (J). Cumulative KGN release from SilMA ​+ ​KGN and SilMA ​+ ​KGNms hydrogels (K). Swelling ratio (L), compressive elastic modulus (M) and in vitro degradation profile (N) of the S, S ​+ ​P, S ​+ ​B ​+ ​K and S ​+ ​B ​+ ​K ​+ ​P hydrogels. ∗P ​< ​0.05 and ∗∗∗P ​< ​0.001.