Organic solvent-free synthesis of phosphorus-containing polymers

Direct, efficient, organic solvent- and catalyst-free synthesis of a series of polyphosphates was accomplished. The reaction involved a gas-liquid interfacial poly-condensation between arylphosphoric dichlorides and bisphenol A. The polyphosphates were characterized by IR, H-1 NMR, P-31 NMR, inherent viscosity, thermal analysis, and molar mass. Yields in the range 70-90 % and inherent viscosities in the range 0.30-0.40 dl/g were obtained. The thermal stability of the polyphosphates was investigated by using thermogravimetry.