Smart chemical design incorporating umbelliferone as natural renewable resource toward the preparation of thermally stable thermosets materials based on benzoxazine chemistry

A smart synthetic chemical design incorporating a natural renewable resource, umbelliferone, is presented to synthesize thermoset materials with good thermal properties. The chemical structure of this coumarin-containing benzoxazine resin is characterized by Fourier transform infrared spectroscopy (FT-IR) and proton nuclear magnetic resonance spectroscopy (H-1 NMR). Thermal properties of the resin and its resulting thermoset are characterized by differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). The thermoset materials are shown to have good thermal stability and a char yield higher than 55%.