Abstract
A study was made of general principles of selecting an optimum pair of solvent +precipitant in the framework of the Scott theory of indivisible liquid in turbidimetric titration of polymer solutions. It was shown that the optimum pair of solvent +precipitant is the combination of a poor solvent (≈ 13 ≈ 0·5) with a precipitant, for which ≈ 23 ≈ ≈ 13 + ≈ 12, ≈ 12 > 0 (≈ being the Flory-Huggins interaction parameter and indices 1,2,3 correspond to the solvent, precipitant and polymer, respectively). These considerations are illustrated using the example of turbidimetric titration of anionic poly-α-methylstyrene in two solvent+precipitant systems: cyclohexane +octanol and dioxane+octanol. Alternatives were examined for eliminating the effect of repeated scattered light for a FEG turbidimeter.
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