This paper describes the synthesis of polyphosphonates from the reaction of phenylphosphonic dichloride (PPD) with bisphenol AF (BPAF) and its derivatives in a chlorinated hydrocarbon solvent under low temperature conditions. The polyphosphonates obtained were characterized by i.r., inherent viscosity, differential scanning calorimetry, thermogravimetric analysis, X-ray diffraction and molar mass. The polyphosphonate obtained from BPAF has a larger inherent viscosity by 0.50 dl g(-1) and a higher glass transition temperature than those derivatives which contain flexible oxyethylene units or bromine atoms. Polyphosphonate derived from BPAF begins to lose 10% of its mass at 415 degrees C and the mass percentage remaining at 700 degrees C is 20.3% under nitrogen. The X-ray diffraction patterns revealed that almost all the polymers were amorphous, except for one polymer which was semicrystalline. The PPD/BPAF and PPD/3,3’,5,5’-tetrabromo bisphenol AF polymers have good flame retardancy, as indicated by high limiting oxygen index values of 43 and 65, respectively. The contact angles of PPD/BPAF polymer formed by water, glycerine and ethylene glycol were larger than those of other polyphosphonates which contain flexible oxyethylene units or bromine atoms.