Abstract
Four kinds of benzoxazine monomers were synthesized, using phenol and aniline, 4-methylaniline, 4-nitroaniline, or 3-nitroaniline as starting materials. La2O3 was incorporated into the benzoxazines to prepare polybenzoxazine composites. The polybenzoxazines and their composites were analyzed through Fourier transform infrared (FTIR), thermogravimetric analysis (TGA), and TGA–FTIR. The results revealed that La2O3 can improve the thermal stability of aniline-based polybenzoxazine (Pa) and 4-methylaniline-based polybenzoxazine (Pa-pC) due to the delay of evaporation of the amine compounds during their thermal degradation process. However, La2O3 did not influence the thermal stability of polybenzoxazines based on 4-nitroaniline (Pa-pN) or 3-nitroaniline (Pa-mN), mainly resulting from the introduction of the nitro group remarkably changing the thermal degradation processes of Pa-pN and Pa-mN, producing a great deal of CO2 and H2O in their degradation gases, while amine and phenolic compounds gases were hardly detected.
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