Table 5. Correlation Coefficients between the Lignin and Film Propertiesa.
| lignin | sugars | ash | Mw | alipOH | PhOH | totOH | COOH | OCH3 | RMS | thick | CA | σc | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| lignin | 1.00 | ||||||||||||
| sugars | –0.47 | 1.00 | |||||||||||
| ash | –0.93 | 0.21 | 1.00 | ||||||||||
| Mw | –0.51 | 0.98 | 0.27 | 1.00 | |||||||||
| alipOH | –0.32 | 0.90 | 0.13 | 0.95 | 1.00 | ||||||||
| PhOH | 0.90 | –0.65 | –0.84 | –0.72 | –0.61 | 1.00 | |||||||
| totOH | 0.69 | 0.24 | –0.81 | 0.20 | 0.36 | 0.50 | 1.00 | ||||||
| COOH | –0.50 | –0.19 | 0.66 | –0.24 | –0.42 | –0.29 | –0.65 | 1.00 | |||||
| OCH3 | 0.89 | –0.48 | –0.90 | –0.53 | –0.41 | 0.85 | 0.47 | –0.56 | 1.00 | ||||
| RMS | 0.96 | –0.65 | –0.83 | –0.69 | –0.52 | 0.89 | 0.45 | –0.32 | 0.90 | 1.00 | |||
| thick | 0.20 | –0.37 | –0.16 | –0.53 | –0.69 | 0.39 | –0.22 | 0.69 | 0.46 | 0.42 | 1.00 | ||
| CA | –0.38 | –0.92 | –0.97 | 0.06 | 0.84 | 0.33 | –0.09 | –0.97 | 0.49 | –0.40 | –1.00 | 1.00 | |
| σc | 0.57 | 0.81 | 0.90 | –0.27 | –0.93 | –0.52 | –0.12 | 0.91 | –0.29 | 0.59 | 1.00 | –0.98 | 1.00 |
a
Lignin = lignin content (%); sugars = sugar content (%); ash = ash content (%); Mw = average weight molar mass (g/mol); alipOH = aliphatic hydroxyl content (mmol/g); PhOH = phenolic hydroxyl content (mmol/g); totOH = total hydroxyl content (mmol/g); COOH = carboxylic acid content (mmol/g); OCH3 = methoxyl content (%); RMS = root mean square roughness (nm); thick= film thickness (nm); CA = WCA (°); σc = critical surface tension (mN/m).