Table 3. Statistical Results for Peak Fitting of −C=O Group.
| C=O of urethane |
C=O of urea |
|||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| free |
hydrogen bonded |
free |
hydrogen
bonded |
|||||||
| sample | v (cm–1) | area (%) | v (cm–1) | area (%) | v (cm–1) | area (%) | v (cm–1) | area (%) | XHa (%) | HBIb |
| WPU-5 | 1723.97 | 20.11 | 1703.09 | 54.07 | 1664.66 | 20.84 | 1637.67 | 4.98 | 58.85 | 1.44 |
| WPU-6 | 1722.13 | 27.89 | 1700.31 | 48.48 | 1663.44 | 17.68 | 1638.53 | 5.94 | 54.25 | 1.19 |
| WPU-7 | 1722.11 | 28.46 | 1700.49 | 48.22 | 1662.99 | 17.84 | 1638.17 | 5.48 | 53.54 | 1.16 |
| WPU-8 | 1720.90 | 36.10 | 1699.11 | 39.17 | 1665.83 | 19.52 | 1639.17 | 5.21 | 44.27 | 0.80 |
| WPU-9 | 1722.62 | 25.56 | 1701.05 | 51.47 | 1662.28 | 17.65 | 1637.92 | 5.32 | 56.63 | 1.31 |
| WPU-10 | 1722.87 | 25.38 | 1701.03 | 51.36 | 1662.39 | 17.80 | 1637.88 | 5.46 | 56.64 | 1.32 |
a
XH is the percent ratio between bonded and total areas for −C=O.
b
HBI is the ratio between the total bonded and total free −C=O.