Isothermal Decomposition Studies of Aromatic and Aromatic-Heterocyclic Polymers in Air.

摘要

Ten aromatic and aromatic-heterocyclic polymers were subjected to aging in air at temperatures of 316 C (600 F) and 371 C (700 F) for up to 600 hours, and the volatile decomposition products were determined by gas chromatography. The predominant volatiles by far were carbon dioxide and carbon monoxide being 91 to 99.6% of the total volatiles. Small amounts of water, methane and traces of other aliphatic hydrocarbons were found. Nitrogen containing polymers produced small amounts of nitrogen oxides, cyanogen and hydrogen cyanide, all of which tend to form, and reach a maximum, later than the other volatiles. The volatiles reach their peak concentration only after a certain aging time, roughly related to the thermal stability of the polymers, and ranging between 1/2 and 500 hours at 371 C. (Author)