The thermooxidative and thermal stabilities of polyurethanes synthesized from polyisocyanate and polyol were assessed by chemiluminescence and thermogravimetry. The effect of varying heating rates, synthesis procedures (i.e., with or without a crosslinking catalyst), atmospheres and long‐term ageing under laboratory conditions were examined and a mechanism of oxidative degradation was proposed based on comparisons of the—separately determined—oxidizability of polyisocyanate and polyol to that of polyurethane.

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