3P-22 PDF
Characterization of thermal degradation products of polymer material by reactive pyrolysis-GC/MS using EI ionization method and PI ionization method
Characterization of thermal degradation product of terephtalate polybuthylene (PBT) has been studied. In pyrogram of PBT thermally treated at 180℃, some peaks changed in intensity depended on the treatment time were observed. Based on the mass spectra obtained by electronicionization(EI) method and photoionization(PI) method, these peaks assigned to the methylated products of decomposed anti-oxidant, reflecting a biphenyl-type cross-linking structure and acid anhydride. The peak of anti-oxidant component disappear in the primary degradation step and after that, the other components appeared prominently. It suggested that the rapid oxidation degradation progressed in a polymer by disappearance of anti-oxidant. This trend seems to relate to the change of material property.