Preparation and Characterization of Novel Polybenzoxazine-Polyester Resin Blends

Blends consisting of polybenzoxazine and polyester with various weight ratios have been prepared by using a solution blending method. Thermal properties of the blends have been investigated by using thermogravimetric and differential scanning calorimetric analysis. Formation of hydrogen bonding was detected by using Fourier transformed infrared spectroscopy. Thermal stability of the blends increased with increasing the amount of polybenzoxazine in the composition. The composition having 70wt% polybenzoxazine and 30wt% polyester resin possesses the highest hardness and comparatively good thermal stability, with an initial decomposition temperature of 274 degrees C and char yield=21%.