Abstract
Two curing protocols were used to polymerize a difunctional benzoxazine monomer based on 4,4`-diamino diphenyl methane. The thermal degradation behaviour of both resulted materials (named PBZ_190 and PBZ_250) was investigated by thermogravimetric analysis coupled with mass spectrometry (TGA/MS), Fourier transform infrared spectroscopy (FT-IR) and X-Ray photoelectron spectroscopy (XPS). The dependence of activation energy on conversion was established using Kissinger-Akahira-Sunose isocoversional method. Degradation of PBZ_250 starts at lower temperatures compared with PBZ_190 but its residual char is higher than for PBZ_190. The degradation of PBZ_250 exhibits a lower activation energy at conversion a < 0.3, and higher values than PBZ_190 for a > 0.3. Keywords: polybenzoxazine, degradation kinetics, thermogravimetric analysis (TGA)