2. Assignment of the Chemical Shifts of the 13C NMR Spectra of the PU, CTS, PU90CTS10, and PU50CTS50 Samples.
| chemical
shifts (δ)/ppm | |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| samples\signal (peak) | CO (a) | C–N (b″) CO (a″) | benzene ring (c″, d″, e″, f″, g″) | CC (j) | C1 | C4 | glycerol (a′, b′, c′) | (l) | C3, C5 | C6 | ethylene glycol; triethanolamine; | C2 | aliphatic CO (b–h; k, m–q) | CH3 | (r) |
| PU | 173.3; 170.6 | 154.6 | 136.7; 130.2; 119.2 | 121.3 | * | * | 76.9; 74.9; 69.1 | 71.9 | * | * | 62.8; 59.7; 55.8; 53.2 | * | 39.9; 34.0; 32.2; 30.0; 23.4; | * | 14.6 |
| CTS | 174.7 | * | * | * | 105.2 | 81.6 | * | * | 75.5 | 61.1 | * | 57.5 | * | 23.7 | * |
| PU90CTS10 | 175.7; 173.0; 169.7 | 154.7 | 136.6; 130.1; 118.7 | * | 104.9 | 83.1 | 75.0; 65.8; 62.4 | 71.5 | 75.0 | 60.5 | 62.4; 60.5; 57.3; 52.9 | 57.3 | 40.6; 39.4; 29.9; 26.3; | 23.4 | 14.6 |
| PU50CTS50 | 174.7; 174.3; 170.2 | 154.5 | 136.9; 130.2; 119.6; 118.1 | 122.7 | 105.0 | 83.0 | 75.4 | * | 75.4 | 61.0 | 61.0; 57.7 | 57.7 | 40.2; 30.0; 26.0; | 23.5 | 14.7 |