PAN预氧丝在BCl3气氛中进行碳化处理, 研究了处理温度与时间对纤维B元素含量的影响. 采用X射线光电子能谱(XPS)、傅立叶红外分析(FTIR)、扫描电镜(SEM)对碳化后纤维的形貌与结构进行表征, 并对其吸波性能进行分析. 结果表明: PAN预氧丝在BCl3气氛下碳化后, 纤维表面生成了BCN包状附着物, 纤维中有B?N键的生成. 与氮气中碳化的碳纤维相比, 纤维的介电常数有所降低, 介电常数虚部降低得较快, 有利于改善纤维的吸波性能.
Pre-oxidized polyacrylonitrile fibers were carbonized in BCl3. Effect of processing temperature and time on B element content in the PAN-based carbon fibers was studied. A series of techniques including XPS, FTIR and SEM, were employed to characterize the composition and structure of the sample. The microwave absorbing properties of the resultant PAN-based carbon fibers were studied by voten network analyzer. The results indicate that the pre-oxidized polyacrylonitrile fibers are converted to carbon fibers by carbonization in BCl3 and BCN attachments are formed. The resultant fiber forms B–N bonds at the same time. The permittivity of carbon fibers/paraffin is lower in comparison of that of fibers carbonized in N2, especially the imaginary part of the permittivity of carbon fibers paraffin reduces fastly. The carbonization in BCl3 is beneficial to improve the microwave absorbing property.
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