“…Three characteristic peaks at 3410, 2897 and 1116 cm −1 were observed in the control cotton, corresponding to O-H, C-H and C-O-C stretching vibrations, respectively[25]. The five peaks at 3182, 2393, 1282, 1054 and 777 cm −1 corresponding to N-H, P-OH, P=O, P-O-C and P-N, respectively, were observed in the ATPEPDPA curve, which is consistent with the ATPEPDPA structure[26][27][28]. In the ATPEPDPA-treated cotton (FRC-20) curve, except for characteristic peaks of cotton fibers, three characteristic peaks appeared at 1241, 1058 and 771 cm −1 , representing P=O, P-O-C and P-N, respectively.…”