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- W2076235609 abstract "The 3000-PAN-filament tows have been stretched by a constant axial load during heating in air at a constant rate of 7.5°Cmin. The extension of the tow begins about the glass-transition temperature (70°C). Temperature dependence of the fibre diameter, width of X-ray reflection of the PAN, and endothermic effect occurring at low temperature (below 240°C), suggest that at 130°C begins a molecular rearrangement. IR spectra of the oxidized fibres and gas evolution suggest that near this temperature (at about 145°C) begins cyclization, but the cyclized fraction of the fibres remains very low up to over 220°C, unless a prolonged oxidation at this temperature is carried out. TGA and DTA results suggest that at about 240°C begins rapid cyclization, which is at about 320°C followed by partial degradation of the fibres. In these processes the fibres lose about 26% of their original weight. Final degradation of the fibres begins at about 400°C." @default.
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- W2076235609 date "1975-01-01" @default.
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- W2076235609 title "Temperature dependence of processes during oxidation of PAN fibres" @default.
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- W2076235609 doi "https://doi.org/10.1016/0008-6223(75)90057-3" @default.
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