Table 2. LDPE contact angle and surface roughness Plackett Burman response variables (ANOVA).
| Static Contact Angle (SCA) | Surface Roughness | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Factor | F value | Prob> f | Stand. Effect | Contribution % | Factor | F value | Prob>f | Stand. Effect | Contribution % |
| p value | p value | ||||||||
| Model | 5.6 | 0.049 | 35.08 | Model | 13.12 | 0.011 | 4.33 | ||
| A-Glucose | 5.8x10-3 | 0.941 | 0.1 | 0.05 | A-Glucose | 0.2 | 0.6679 | 0.04 | 0.2 |
| B-CuSO4 | 2.74 | 0.014 | -2.21 | 22.45 | B-CuSO4 | 2.84 | 0.1539 | 0.13 | 2.61 |
| C-ABTS | 3.0x10-6 | 0.999 | -2.3x10-3 | 2.1x10-5 | C-ABTS | 19.91 | 0.0021 | -0.38 | 20.94 |
| D-pH | 1.5 | 0.041 | -0.17 | 0.12 | D-pH | 32.09 | 0.0005 | -0.48 | 33.76 |
| E-Time | 3.3 | 0.037 | -0.23 | 0.24 | E-Time | 10.91 | 0.0108 | -0.28 | 11.47 |
| Curvature F-value | 1.41 | 0.269 | Curvature F-value | 21.46 | 0.0017 | ||||
| Lack of fit | 8.10 | 0.114 | Lack of fit | 1.24 | 0.5101 | ||||
In bold: significant values for the model and factors that resulted significant in the model