“…The peaks at 1376 and 947 cm −1 are due to the vibrations of C–H bending and C–O–H deformation, respectively [ 41 ]. In the FTIR spectrum of BDDGE ( Figure 1 b), the characteristics peaks at 2927, 2865, 1253, 1100, and 908 cm −1 are responsible for C–H stretching of epoxy ring, C–H stretching –CH 2 bond, C–C bond, C–O–C stretching, and C–O stretching vibrations of epoxy ring, respectively [ 42 ]. While, in the FTIR spectrum of HA-BDDGE gel ( Figure 1 c), the peaks at 3317, 2924, 1608, 1562, 1405, 1374, and 946 cm −1 are because of the stretching vibrations of O–H/N–H bond, C–H bond, C=O bond, amide-II, C–O bond of –COONa group, vibration C–H bending, and C–O–H deformation, respectively.…”