Table 2.
Bonding strength and formaldehyde emission of phenolic resins, and relative absorbance values of functional group (RIMe) of lignin.
| Experiment ID | A | B | C | Bonding strength (MPa) | Formaldehyde emission (mg/L) | RIMe |
|---|---|---|---|---|---|---|
| 1 | 1 | 1 | 1 | 1.01 ± 0.08 | 0.48 ± 0.01 | 0.941 |
| 2 | 1 | 2 | 2 | 0.95 ± 0.10 | 0.13 ± 0.05 | 0.947 |
| 3 | 1 | 3 | 3 | 0.83 ± 0.06 | 0.28 ± 0.02 | 0.944 |
| 4 | 2 | 1 | 3 | 0.89 ± 0.11 | 0.38 ± 0.04 | 0.961 |
| 5 | 2 | 2 | 1 | 0.77 ± 0.20 | 0.15 ± 0.04 | 0.965 |
| 6 | 2 | 3 | 2 | 0.92 ± 0.07 | 0.09 ± 0.02 | 0.962 |
| 7 | 3 | 1 | 2 | 0.62 ± 0.14 | 0.66 ± 0.03 | 0.960 |
| 8 | 3 | 2 | 3 | 0.93 ± 0.08 | 0.79 ± 0.03 | 0.980 |
| 9 | 3 | 3 | 1 | 0.82 ± 0.11 | 0.37 ± 0.05 | 0.936 |
| K1 | 2.79 | 2.52 | 2.60 | - | - | - |
| K2 | 2.58 | 2.65 | 2.49 | - | - | - |
| K3 | 2.37 | 2.57 | 2.65 | - | - | - |
| k1 | 0.93 | 0.84 | 0.87 | - | - | - |
| k2 | 0.86 | 0.88 | 0.83 | - | - | - |
| k3 | 0.79 | 0.86 | 0.88 | - | - | - |
| R | 0.14 | 0.04 | 0.05 | - | - | - |
| Order | A > C > B | - | - | - | ||
| Optimal level | A1 | B2 | C3 | - | - | - |
| Optimal combination | A1B2C3 | 1.07 ± 0.12 | 0.22 ± 0.03 | 0.927 | ||