Abstract
Main prerequisites of turbidimetric titration were formulated in order to describe the solubility and related MWD of polymers. The concept of efficiency of turbidimetric titration was introduced, the quantitative measure of which is the maximum relative proportion of the polymer precipitated M ̃ max /c 0 , determined by spectroturbidimetric titration of a number of polymer+solvent+precipitant systems, which show a proportional dependence of M max/ c 0 on the actual concentration (considering dilution) of the polymer in system c ∗ . The range of variation of M ̃ max /c 0 = ƒ (c ∗) depends on thermodynamic parameters of the system. The main condition of optimization of turbidimetric titration is the equality M ̃ max /c 0 = 100% , which may only be achieved from a value of c ∗ > c l ∗ , dependent on the function ƒ(c ∗) . In the range of c ∗ > c t ∗ , where c t ∗ depends on the design of the turbidimeter, the calculated value of M ̃ max /c 0 decreases with an increase of c ∗ because of the distortion of results as a consequence of effects of secondary and repeated light scattering. Optimization of turbidimetric titration involves the selection of conditions, ensuring the existence of the interval c l ∗ < c ∗ < c t ∗ , where the condition M ̃ max /c 0 = 100% holds good.
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