Viscosity Behavior of Coacervates of Magnesium and Calcium Highpolyphosphates

The viscosities of magnesium and calcium highpolyphosphate coacervates were measured in the temperature range of 20 to 90 °C. The Andrade’s Equation was an approximate representation for the temperature dependence of viscosities of the coacervates. The activation energies of flow for the highpolyphosphate coacervates of magnesium and calcium were calculated to be about 7 kcal/mol and about 15 kcal/mol, respectively. The extension of the phosphate chains in coacervates was considered to be restricted, and the spinnability of the coacervates was probably originated, not by an elastic network structure, but by high viscosity of the coacervates. The viscosities of the magnesium coacervates decreased with an increase in water content and no remarkable effect of ethyl alcohol on the preparation of the coacervates was found.