Abstract
Abstract The ion-exchange chromatographic technique was used in order to find the average chain number of a polyphosphate product. For the assignment of the nth polymer in the obtained chromatogram, the dependence of the distribution coefficient, Kd, on the eluent concentration examined by the use of both 20-cm and 60-cm resin columns. A lower series of polyphosphate was included in a relatively large amount in order that the average chain number based on the chromatographic analysis could be duly appreciated only for the case of basic polymers with lower molecular weights. For a product “Graham Salt” with a number of phosphate links, the higher series of polyphosphate could not be desorbed entirely from the resin column; the accurate estimation of the average number was, then, improbable. The viscosity method is also not advisable to use the computation of a mean polymerization number in the polyphosphate with a low molecular weight. An attempt was made to improve the data on the average chain number by the viscosity measurements together with the chromatographic analysis of the polymer constituent.
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