The thermal oxidative degradation of two aromatic and one segmented polyurethane has been studied, with special emphasis on HCN evolution over a range of temperatures and oxygen concentrations. A tentative mechanism for HCN formation has been presented. Other gaseous products were ascertained by chromatography. Infrared spectra during degradation were measured, and the extent of crosslinking was also determined. It is shown that HCN evolution can be inhibited by copper or its oxide.
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Jellinek et al. (1977) studied this question.
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