Phosphine Oxide Containing Poly(pyridinium salt)s as Fire Retardant Materials.

Six new rugged, high-temperature tolerant phosphine oxide-containing poly(4,4'-(-phenylene)-(2,6-diphenylpyridinium)) polymers , , , , , and are synthesized, characterized, and evaluated. Synthesis results in high yield and purity, as confirmed by elemental, proton (H), and carbon 13 (C) nuclear magnetic resonance (NMR) spectra analyses. High glass transition temperatures ( > 230 °C) and high char yields (>50% at 700 °C) are determined by differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA), respectively.