Monofunctional benzoxazine with para-methylol functionality has been synthesized via Mannich condensation. The chemical structure of the synthesized monomer is confirmed by 1H nuclear magnetic resonance (NMR), 13C NMR and Fourier transform infrared spectroscopy (FT-IR). Polymerizations are monitored by in situ FT-IR, 1H 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.

Synthesis, polymerization kinetics and thermal properties of para-methylol functional benzoxazine

254th National Meeting (2017)

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