Table 4. Normalization of Each Characteristic Absorbance Peak of B-100 IR Spectra

Assignment	Wavenumber (cm−1)	Absorbance	Normalized Value (AI./A1598)
N=C=O asymmetric stretching	2270	0.0000	0.0000
U1, ICU C=O stretching	1710	0.1360	1.0746
Urea C=O stretching	1654	0.0820	0.6482
U1, U2, ICU Phenyl Ring stretching	1598	0.1265	1.0000
U1, U2 N-H bending	1510	0.2162	1.7089
Isocyanurate ring C-N stretching	1411	0.1336	1.0557