Abstract
The results of viscosity measurements on several samples of lithium-potassium copolyphosphates (Li:K ratio ranging from 9:1 to 5:5) in salt-free aqueous solutions and in theta solvents are reported. Molecular weights determined by end-group titration ranged from 4000–10000. In aqueous solutions the Fuoss equation parameter A was found to be nearly proportional to the square of molecular weights, indicating rod-like structures of the poly-ions at infinite dilution. The concentrations of NaBr solutions acting as theta solvents at 35°C were determined for all cases and the viscosity data in θ-solvents were utilized in calculating unperturbed dimensions which were found to lie in the range 4.7×10−7 cm to 7.4×10−7 cm.
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