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Journal of Chemistry
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2013
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Article
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Tab 3
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Research Article
Optimization of Environmentally Benign Polymers Based on Thymine and Polyvinyl Sulfonate Using Plackett-Burman Design and Surface Response
Table 3
Levels of the variables tested in the CCD.
Variable
Type
Symbol
Factorial levels
Axial levels
Central level
pH
Numerical
7.50
10.50
6.00
12.00
9.00
Concentration
Numerical
4.00
8.00
2.00
10.00
6.00