OPTIMIZATION OF THE PREPARATION OF POLYPHOSPHATE COACERVATES USED AS GLASS PRECURSORS

The coacervation of polyphosphates permits to formulate a glass precursor in aqueous media and at ambient temperature. This reaction, which consist on a phase separation is induced by an addition of electrolyte or by a modification of the solvent properties. It depends on different parameters which are not yet entirely controlled. Some previous interpretation of this phenomenon are also inadequate. We have studied the influences of the chain length of the polyphosphates, of the solvent properties and of the electrolytes used. The results obtained indicate the possibility of coacervate achievement by univalent cation supply. They also permit an optimization of the process, for the choices of the commercial compounds, of the electrolytes and of the solvent.