Thermal stability of model compounds related to thermostable polymers by pyrolysis‐gas chromatography

Abstract

Abstract Thermal stabilities of eighteen model compounds related structurally to thermostable polymer systems were determined accurately by pyrolysis‐gas chromatography. This approach offers distinct advantages over previously used indirect methods which measure parameters other than actual starting material remaining undecomposed. Both the oxadiazole ring and the aromatic amide link were found to have poor thermal stabilities in comparison with other compounds studied. Since polymers based on these two features have been shown to be valuable for use in air at 200–400°C., the data suggest that oxidation resistance rather than the ultimate in pure thermal resistance should be sought in all‐purpose thermostable materials.