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. 2023 Feb 16;15(4):986. doi: 10.3390/polym15040986

Figure 4.

Figure 4

Chemical structures of OD–DA and HTCC: (a) schematic representation of the dual-cross–linking mechanism and the cleavage of the Schiff base bonds, followed by the release of DFO and AgNPs; (b) G’ and G’’ of the hydrogels as a function of the frequency and the % applied strain; (c) self-healing behavior of hydrogel 4 and alternate step strain sweep experiments for hydrogel 1 and hydrogel 4 at strains ranging from 1 to 200% (d) Note: Hydrogel 1: control hydrogel, Hydrogel 2: hydrogel@AgNPs, Hydrogel 3: hydrogel@DFO, Hydrogel 4: hydrogel@AgNPs-DFO. Adapted with permission from [53].