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Table 1 Vibrational band assignment in the FTIR spectra reported in Fig. 2

From: Synthetic materials in art: a new comprehensive approach for the characterization of multi-material artworks by analytical pyrolysis

Wave number (cm−1) Assignment
3664–3430 ν N–H (non H-bonded)
3286 ν N–H (H-bonded)
3191–3012 ν C–H (aromatic ring)
2971 νa C–H3
2931 νa C–H2
2869 νs C–H3
1731 ν O=C (ester, PVAc)
1671 ν O=C (monodentate urea disordered H-bonded)
1641 ν O=C (urea strongly H-bonded)
1592 ν C=C (aromatic ring)
1535 δ O=C–N–H; ν O = C-N–H
1504 ν-N=N-(β-naphthol)
1477 δ C–H2
1442 δa C–H3
1411 Trimer formation band (isocyanurate ring)
1373 δs C–H3
1338 ω C–H2
1294, 1226 ν C–N
1093 νa C–O–C (polyether-based polyol)
1018 ν C–O–H
939 ρ C–H3
892, 885, 867, 813 ω C–H (aromatic ring)
794 ρ C–H (PVAc)
750, 709, 669 δ C–H (aromatic ring)