Thermal decomposition mechanisms common to polyurethane, epoxy, poly(diallyl phthalate), polycarbonate and poly(phenylene sulfide)

Thermal decomposition of polyurethane, epoxy, poly(diallyl phthalate), polycarbonate, and poly(phenylene sulfide) was examined using a combination of thermal and chemical analysis techniques. Thermal gravimetric analysis with simultaneous analysis of evolved gases by Fourier transform infrared spectroscopy, differential scanning calorimetry, and gas chromatography coupled with Fourier transform infrared spectroscopy were used to obtain rate data, determine enthalpy changes, and identify decomposition products. Examination of the evolved decomposition products indicated a common set of chain scission mechanisms involving the aromatic moieties in each of the polymer materials studied.