Studies in inorganic polyelectrolytes. I. Graham's salt: Dependence of molecular weight on the conditions of formation

Abstract

AbstractNearly 70 samples of Graham's salt were prepared by heating sodium dihydrogen phosphate under varying conditions and then chilling the melt. The molecular weights of the samples, determined according to Strauss by measuring intrinsic viscosity in 0.035 N sodium bromide solution, were found to depend on the conditions of formation, e.g., the nature of the surface of the vessel in which the melt was prepared and the temperature of the melt. Endgroup molecular weights of many samples were also calculated, and an attempt has been made to correlate these calculations with the weight‐average molecular weights. A modification of an empirical formula of Strauss giving molecular weights by a single determination of specific viscosity in water has also been suggested.