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Assignment of the bands for PEI and SPA in ATR-FTIR.
| Wavenumber (cm−1) | Identification |
|---|---|
| 3390 | N–H vibration (PEI) |
| 2993 | C–H stretching (PEI) |
| 1628 | N–H bending (PEI) |
| 1462 | CH2 vibrations (PEI) |
| 1390 | PEI – SPA interaction |
| 1160 | C–O–C asymmetric bridge stretching (SPA) |
| 1035 | C–O–P vibrations (SPA) |
| 920 | C–O–P vibrations (SPA) |
| 504 | PO32− asymmetric bending (SPA) |
