Table 5.
Descriptions of characteristic bands observed during FTIR studies for the studied filaments.
| Band | Wavelength (cm−1) | Assignment |
|---|---|---|
| ν(N-H) | 3300 | N-H stretching vibration of urethane groups |
| ν(C-H) | 3100–3000 | C-H stretching vibrations of aromatic bonds |
| ν(C-H) | 3000–2800 | C-H symmetric and asymmetric stretching vibrations of methylene and methyl groups |
| ν(C=O) | 1750–1725 | C=O stretching vibration of ester groups |
| ν(C=O) | 1690 | C=O stretching vibration of urethane groups |
| ν(C=C) | 1600, 1490, 1450 | C=C stretching vibration of aromatic groups |
| ν(C-N) | 1220 | C-N stretching vibration of urethane groups |
| ν(C-O) | 1160 | C-O stretching vibration of ester groups |
| ν(C-O) | 1100 | C-O stretching vibrations of ether groups |