LAUSR

Abstract Monofunctional benzoxazine with para -methylol functionality has been synthesized via Mannich condensation. The chemical structure of the synthesized monomer is confirmed by 1 H nuclear magnetic resonance (NMR), 13 C NMR and Fourier transform infrared spectroscopy (FT-IR). Polymerizations are monitored by in situ FT-IR, 1 H NMR and differential scanning calorimetry (DSC). Activation energy of the polymerization is also studied by DSC. The apparent activation energy of the polymerization is calculated to be 79.8 kJ mol − 1 and 81.5 kJ mol − 1 according to the Kissinger and Ozawa methods, respectively. In addition, thermogravimetric analysis (TGA) result shows that the polybenzoxazine derived from para -methylol functional benzoxazine possesses excellent thermal stability with an initial decomposition temperature of 395 °C for a 5% weight loss and a char yield of 60% at 800 °C under N 2 .