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Thermal degradation behaviors and reaction mechanism of carbon fibre-epoxy composite from hydrogen tank by TG-FTIR

Zhang, Zhi, Wang, Changjian, Huang, Gai, Liu, Haoran, Yang, Shenlin, Zhang, Aifeng
Journal of hazardous materials 2018 v.357 pp. 73-80
Fourier transform infrared spectroscopy, activation energy, aldehydes, anhydrides, caprolactam, carbon, carbon dioxide, carbon monoxide, epoxides, gases, hydrogen, models, phenol, pyrolysis, reaction mechanisms, spectral analysis, thermogravimetry
Thermal degradation behaviors and reaction mechanism of Carbon fibre-epoxy composite, obtained from Chinese widely applied hydrogen storage tank, were studied by thermogravimetry combined with Fourier transform infrared spectrometry at varying heating rates. The pyrolysis of carbon fibre-epoxy composite mainly occurs at 550–750 K. The average value of final residue is 72.42%. The calculated activation energies increase exponentially from 206.27 KJ/mol to 412.98 KJ/mol with the average value of 276.6 KJ/mol. The fourth reaction order model is responsible for the pyrolysis of carbon fibre-epoxy composite. The absorption spectra of the evolved gases provided the information that the main evolved products are H2O, CO2, CO (acid anhydride, ketone or aldehyde), ε- caprolactam, alcohols and phenol. Moreover, CO group > alcohols > phenol > ε- caprolactam > CO2 > H2O. Epoxy is the main pyrolysis crude material in carbon fibre-epoxy composite.