Research Article
Preparation of Soy-Based Adhesive Enhanced by Waterborne Polyurethane: Optimization by Response Surface Methodology
Table 3
Variables and levels used in RSM design.
| | Source | SS | Df | MS | F value | value | Significance |
| | Model | 0.084 | 9 | 9.328 × 10−3 | 9.67 | 0.0034 | | | X1 | 8.45 × 10−3 | 1 | 8.45 × 10−3 | 8.76 | 0.0211 | | | X2 | 4.5 × 10−4 | 1 | 4.5 × 10−4 | 0.47 | 0.5165 | — | | X3 | 1.25 × 10−3 | 1 | 1.25 × 10−3 | 1.30 | 0.2924 | — | | X1X2 | 0.02 | 1 | 0.02 | 20.33 | 0.0028 | | | X1X3 | 6.4 × 10−3 | 1 | 6.4 × 10−3 | 6.64 | 0.0367 | | | X2X3 | 2.5 × 10−3 | 1 | 2.5 × 10−3 | 2.59 | 0.1514 | — | | X12 | 5.158 × 10−3 | 1 | 5.158 × 10−3 | 5.35 | 0.0540 | — | | X22 | 0.015 | 1 | 0.015 | 15.72 | 0.0054 | | | X32 | 0.021 | 1 | 0.021 | 21.40 | 0.0024 | | | Residual | 6.75 × 10−3 | 7 | 9.643 × 10−4 | — | — | — | | Lack of fit | 4.55 × 10−3 | 3 | 1.517 × 10−3 | 2.76 | 0.176 | — | | Pure error | 2.2 × 10−3 | 4 | 5.5 × 10−4 | — | — | — | | Correlation total | 0.091 | 16 | 9.328 × 10−3 | — | — | — | | R2 | 0.9256 | — | — | — | — | — |
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Note. Significant at the 5% level ( ); significant at the 1% level ( ). |
