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

Table 2

Twelve-trial PBD matrix for seven variables (A to G): experimental input values, and observed and predicted absorbance^a.

Run order	Experimental values							Absorbance^b
	A	B	C	D	E	F	G	Observed	Predicted
1	12.0	2	30	1	13.6	Yes	1 : 4	0.18	0.17
2	6.00	10	30	30	13.6	No	1 : 4	0.54	0.52
3	12.0	10	120	1	13.6	No	1 : 1	0.58	0.61
4	12.0	2	120	30	13.6	Yes	1 : 4	0.10	0.11
5	12.0	2	30	30	6.8	No	1 : 1	0.44	0.37
6	6.00	2	30	1	6.8	Yes	1 : 1	0.39	0.43
7	6.00	10	30	30	13.6	Yes	1 : 1	0.67	0.70
8	6.00	2	120	1	13.6	No	1 : 1	0.61	0.58
9	6.00	2	120	30	6.8	No	1 : 4	0.15	0.19
10	12.0	10	30	1	6.8	No	1 : 4	0.24	0.28
11	6.00	10	120	1	6.8	Yes	1 : 4	0.36	0.29
12	6.00	2	120	30	6.8	No	1 : 4	0.17	0.19

^aA–G are symbols shown in Table 1. ^bAbsorbance measured at 610 nm.