Evolution of PAN macromolecular structural transformations during pre-oxidative stabilization

Journal of Beijing University of Chemical Technology ›› 2011, Vol. 38 ›› Issue (4) : 58-63.

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Journal of Beijing University of Chemical Technology ›› 2011, Vol. 38 ›› Issue (4) : 58-63.
材料科学与工程

Evolution of PAN macromolecular structural transformations during pre-oxidative stabilization

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Abstract

Polyacrylonitrile (PAN) fibers were pre-oxidized in air at temperatures from 130 ℃ to 190 ℃. The primary evolution of the PAN macromolecular structure was investigated by Fourier transform infrared spectroscopy (FT-IR), gel permeation chromatography (GPC) and elemental analysis (EA). The results indicated that when the pre-oxidation temperature was at about 130 ℃, an ester carbonyl group was formed via intramolecul cyclization and intermolecular cross-linking initiated by the carboxylic acid group in PAN macromolecules. As the temperature increased, conjugated —C=N—C=N— and —C=C—C=C— structures arising from the further cyclization and dehydrogenation. when the heat treatment temperature was higher than 190 ℃, an unsaturated aromatic ring structure was formed due to the accelerated pre-oxidative stabilization.

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Evolution of PAN macromolecular structural transformations during pre-oxidative stabilization[J]. Journal of Beijing University of Chemical Technology, 2011, 38(4): 58-63

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