Optimization of Environmentally Benign Polymers Based on Thymine and Polyvinyl Sulfonate Using Plackett-Burman Design and Surface Response

Table 6

ANOVA for RSM two factor interaction model.

Source	Coefficient estimate^a	Sum of squares	df^b	Mean square	𝐹 value	𝑃 value
						Prob > 𝐹
Model		0.10592423	3	0.03530808	34.3997072	0.0004
𝑋1-pH	−0.069	0.01380408	1	0.01380408	13.4489461	0.0105
𝑋2-Conc.	−0.095	0.08377837	1	0.08377837	81.6230066	0.0001
𝑋1𝑋2	0.015	0.00834178	1	0.00834178	8.12716909	0.0292
Residual		0.00615844	6	0.00102641
Lack of Fit		0.00441794	5	0.00088359	0.50766308	0.7806
Pure Error		0.0017405	1	0.0017405	34.3997072	0.0004
Cor Total^c		0.11208267	9

^aIn terms of actual factors. For the intercept, the coefficient estimate is 0.9406. ^bDegree of freedom. ^cSum of total squares corrected for the mean.