Table 1.

Dynamic covalent bonds applied for adaptable hydrogel.

Kind	Chemical Reaction	Ref
C-C
Reversible Diels–Alder Reaction		[[85], [86], [87], [88], [89], [90]]
C-N
Hydrazone Bonds		[91–96, 111, 122, 172, 173]
Schiff Base Bonds		[97,98]
C-S
Thioester		[101,102]
B-O
boronate bonds		[104]
S-S
Disulfide Bonds		[107]