1. Formulations of Standard and Chitosan-Based Polyurethane Foams Based on 100 g of Polyol .
| Sample | Polyether Polyol (g) | Chitosan-Based Polyol (g) | Isocyanate (g) | DBTDL (g) | H2O (g) | Surfactant (g) |
|---|---|---|---|---|---|---|
| Standard PU Foam | 100 | 0 | 65 | 1.5 | 1.5 | 0.75 |
| 25 CH/PU Foam | 75 | 25 | 65 | 1.5 | 1.5 | 0.75 |
| 50 CH/PU Foam | 50 | 50 | 65 | 1.5 | 1.2 | 0.75 |
| 65 CH/PU Foam | 35 | 65 | 65 | 1.5 | 1.2 | 0.75 |
a
Note: In polyurethane foam formulations containing 50% and 65% chitosan-based polyol, the amount of water added to the system was optimized to 0.71% by weight, considering the trace amounts of residual water that may be retained in the structure via hydrogen bonds during polyol synthesis.