The effects of the conventional heating method and the microwave heating method on polyacrylonitrile-based fibres in the temperature range of 180–280 °C were investigated. Fourier transform infrared spectroscopy, X-ray wide-angle scattering, Raman spectroscopy, energy-dispersive spectrometer, scanning electron microscopy and bulk density were used to characterise the properties of the samples. Results show that the microwave heating method can shorten the pre-oxidation time, reduce pre-oxidation temperature and reduce the number of surface defects. The pre-oxidised fibres obtained by the microwave heating method exhibit not only good crystallite size but also a smooth surface. Atomic morphology and molecular arrangement are orderly inside the fibre. The FT-IR spectrum shows that the oxidation reaction occurs at 220 °C, and the CI value of PAN fibers stabilised by microwave heating is the larger than the fibers stabilised by conventional heating. XRD analysis shows that fibers stabilised by microwave heating have low stack domains. The SEM and Raman spectra indicate that hydrogen peroxide can improve the surface finish of the fibers and reduce defects. Microwave heating can reduce the pre-oxidation temperature by about 20 °C and shorten the heating time. The economic benefits of using this method are significantly improved.

中文翻译：

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聚丙烯腈基纤维常规加热与微波加热的比较研究

研究了常规加热方法和微波加热方法对180-280°C温度范围内聚丙烯腈基纤维的影响。傅里叶变换红外光谱，X射线广角散射，拉曼光谱，能量色散光谱仪，扫描电子显微镜和堆积密度被用来表征样品的特性。结果表明，微波加热法可以缩短预氧化时间，降低预氧化温度，减少表面缺陷数量。通过微波加热法获得的预氧化纤维不仅具有良好的微晶尺寸，而且具有光滑的表面。纤维内部的原子形态和分子排列是有序的。FT-IR光谱表明，氧化反应在220°C时发生，微波加热稳定的PAN纤维的CI值大于常规加热稳定的纤维的CI值。XRD分析表明，通过微波加热稳定的纤维具有低的堆叠域。SEM和拉曼光谱表明，过氧化氢可以改善纤维的表面光洁度并减少缺陷。微波加热可以将预氧化温度降低约20°C，并缩短加热时间。使用此方法的经济利益得到了显着改善。微波加热可以将预氧化温度降低约20°C，并缩短加热时间。使用此方法的经济利益得到了显着改善。微波加热可以将预氧化温度降低约20°C，并缩短加热时间。使用此方法的经济利益得到了显着改善。