Thermal characteristics of high-strength and thermostable aromatic fibres |
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Authors: | K. E. Perepelkin E. N. Dresvyanina E. A. Pakshver |
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Affiliation: | (1) St. Petersburg State University of Technology and Design, St. Petersburg, Russia |
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Abstract: | 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. Translated from Khimicheskie Volokna, No. 3, pp. 72–74, May–June, 2008. |
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