Synthesis and characterization of phosphorus-containing flame retardant BHPPO

A phosphorus-containing flame retardant bis(4-hydroxyphenyl) phenyl phosphine oxide (BHPPO) was synthesized by the reaction of phenyl phosphonic dichloride (PPD) and hydroquinone (HQ). The chemical structure of the obtained compound was identified by FT-IR, ¹H NMR, ¹³C NMR and ESI-MS. The optimum reaction conditions were determined as follows: in nitrogen atmosphere, the mole ratio of phenyl phosphonic dichloride and hydroquinone was 1:2.4, 40 mL xylene as solvent, reaction temperature was 130℃, the reaction time was 10 h, yield was 91.73%. And the thermal stability of BHPPO was tested by MP and TG.