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) |