Table 2 Chemical shifts of C in the pure and blended hydrogels

23.96

− CH₂– carbon of residual acetate

(Jayasekara et al. 2004)

44.80

− CH₂–

(Jayasekara et al. 2004)

56.54

C2

(Jayasekara et al. 2004)

64.53

C6, Peak I

(Jayasekara et al. 2004; Lai et al. 2002)

70.48

Peak II

(Lai et al. 2002)

75.32

Peak I

(Lai et al. 2002)

99.98

C1

173.20

C=O (ester)

(Katoh and Ando 2016)

180.61

C=O (amide)

(Katoh and Ando 2016)