Abstract
A novel benzoxazine containing pyridyl group (B-3py) was prepared from 3-aminopyridine, bisphenol A, and paraformaldehyde. Polymerization behavior of B-3py was investigated by differential scanning calorimetry (DSC). The DSC thermograms revealed that the exothermic peak due to the ring-opening polymerization of benzoxazine were shifted to lower temperature range by introducing pyridyl group because the pyridyl group served as a catalyst for the polymerization. B-3py was thermally treated up to 240°C on a glass plate, affording a brown colored transparent polybenzoxazine (PB-3py) film. The dynamic mechanical analysis of the film showed that the glass transition temperature of PB-3py was higher than that of a typical polybenzoxazine without pyridyl group (PB-a). This result is probably due to the further formation of hydrogen bonding through the pyridyl group as suggested by infrared analysis of the film. Moreover, thermogravimetric analysis revealed that 5 and 10% weight loss temperatures and char yield at 850°C of PB-3py were higher than those of PB-a. These results clearly indicate that the thermal properties of polybenzoxazine can be improved by introducing the pyridyl group in the network structure.
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