Table 1.
This table describes the attenuated total reflection infrared spectroscopy (ATR-FTIR) spectra and its corresponding bonds: their values and where they come from.
| Band, cm−1 | Bond | Coming from |
|---|---|---|
| 3,378 cm−1 | N–H hydrogen bond stretching | Isocyanates group |
| 1,525 cm−1 | C–N stretching and N–H bending | Urethane group |
| 3,492 cm−1 | NCO groups | Isocyanates group |
| 1,637 cm−1 | carbon double bonds | modified PCL |
| 814 cm−1 | carbon double bonds | modified PCL |
| 1,722 cm−1 | carbonyl absorption in | crystalline PCL |
| 1,455 cm−1 | associated with the gauche isomer | The methylene groups in the amorphous regions |
| 1,600–900cm-1 | chain conformation | vibration of the methylene and ester groups |