New technique for the synthesis of polyphosphoesters

Polycondensation of arylphosphonic(phosphoric)dichlorides with various bisphenols was carried out using a new technique, namely, solid-liquid phase transfer catalysis. Potassium phosphate was used as the base. The synthesis of polyphosphonate by solid-liquid phase-transfer catalyst (PTC) polycondensation of phenylphosphonic dichloride with 4,4'-cyclohexylidenebisphenol is presented in detail. The structures of the polyphosphonates and flu- orine-polyphosphate were studied using this technique. The polymers were characterized by gel permeation chro- matography, Fourier transform infrared spectroscopy (FTIR), 1 H and 31 P nuclear magnetic resonance (NMR) spectroscopy, differential scanning calorimetry, and thermal analysis. Yields in the range of 80.2-86.5, and inherent viscosities in the range of 1.48-2.5 dL/g were obtained. High molecular weight polymers (Mn of ~11,800-21,600) were successfully prepared. The polymers were self-extinguishing and started losing weight at around 280-380 o C. The glass-transition temperatures of the polymers were detected in the range of 85-180 o C. The flammability was