The thermal characteristics of para-aramid, polyoxadiazole, and polyimide fibres were comparatively investigated by dynamic thermogravimetric analysis, differential scanning calorimetry, and thermomechanical analysis. It was shown that thermooxidative degradation of these types of fibres began at 400–450 °C and intensified at higher temperatures. The fibres investigated are characterized by size stability up to the initial temperature of thermooxidative processes (400–450 °C). With respect to thermal stability, these fibres are in the following order: polyimide > polyoxadiazole, and carbocyclic para-aramid fibres. The correlation of the “hydrogen index” IH and “aromaticity index” IAr for thermostable fibres with their thermal stability was demonstrated.
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Translated from Khimicheskie Volokna, No. 3, pp. 72–74, May–June, 2008.
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Perepelkin, K.E., Dresvyanina, E.N. & Pakshver, E.A. Thermal characteristics of high-strength and thermostable aromatic fibres. Fibre Chem 40, 266–269 (2008). https://doi.org/10.1007/s10692-008-9050-5
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DOI: https://doi.org/10.1007/s10692-008-9050-5