Application of gas chromatography to the analysis of thermal decomposition products of some sulphur containing polyurethanes

Zirconium dioxide@phosphazene for enhancing mechanical property, flame retardancy, and thermal property of polythiourethane composites

“…The band at 1620 cm −1 was assigned to CC vibration of the generated aromatic compounds. The vibration peak at 1405 cm −1 was assigned to the characteristic peak of thiophene produced by the pyrolysis of thioether 42 . Notably, the peaks at 1259–1211 and 1081 cm −1 were belonging to PO and POH respectively, suggesting that the decomposition of cross‐linked PZS produced polyphosphoric acid and phosphates 43 .…”

“…The vibration peak at 1405 cm À1 was assigned to the characteristic peak of thiophene produced by the pyrolysis of thioether. 42 Notably, the peaks at 1259-1211 and 1081 cm À1 were belonging to P O and P OH respectively, suggesting that the decomposition of cross-linked PZS produced polyphosphoric acid and phosphates. 43 Unsurprisingly, there were characteristic F I G U R E 6 Scanning electron microscope photographs of the external (a-d) and internal surfaces (e-h) of the residues of pure polythiourethane (PTU), ZrO 2 @PZS/PTU-1, ZrO 2 @PZS/PTU-2, and ZrO 2 @PZS/PTU-3 composites can be seen that the broad absorption band between 3500 and 3750 cm À1 was attributed to the OH group, which resulted from the gaseous H 2 O or other OH-containing organic compounds produced during the pyrolysis process.…”