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FTIR-ATR characteristic peaks assignment for UP2-O-0.
| Functional group | Wavenumber/cm−1 |
|---|---|
| pMDI N=C=O stretching | 2270 |
| pMDI aromatic C=C stretching | 1611, 1578 |
| Urethane prepolymer (UP) urethane N–H stretching | 3200–3400 |
| UP urethane C=O stretching | 1680–1760 |
| UP urethane N–H bending and C–N stretching | 1524–1527 |
| UP urethane C–O stretching | 1220–1222 |
| UP aromatic C=C stretching | 1598 |
| PPG 2000 C–O–C stretching | 1100 |
| PPG 2000 CH2 stretching vibration (symmetric and asymmetric) | 2857–2940 |
