Abstract
In this research, benzoxazine monomer was irradiated with gamma ray at various radiation doses, i.e. 0, 30, 100 and 300 kGy. The synthesized polymers were obtained by heating without need of catalyst. The curing behaviors of the radiated monomer and thermal stability of the synthesized polymer was observed and compared. The thermograms of differential scanning calorimeter (DSC) reveal that the radiation was able to reduce the energy consumption during polymerization. Furthermore, the temperature peak of polymerization of monomer was lower with increasing the radiation dose. At low radiation dose, the thermograms from thermogravimetric analysis reveal that there was no significant change of degradation temperature and char yield of the synthesized polymer, while the improvement of the degradation temperature and the increase in char yield were observed in the polymer synthesized from benzoxazine monomer radiated at 300 kGy. In addition, the results reveal that the amount of water uptake of polymers obtained from radiated monomer was significantly low, whereas the hardness of the polymer synthesized from monomer radiated at 300 kGy was higher than the polymer synthesized from non-radiated monomer.
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