聚丙烯腈（PAN）原丝微观结构中存在的缺陷极大会影响炭纤维的强度。采用0T、8T、12T、16T的强磁场对原丝进行处理,研究了磁场对原丝的结晶取向度、总取向度、结晶尺寸、结晶度等微观结构的影响。结果表明,磁场对纤维的晶区和非晶区都有取向作用,其取向度都随磁场强度的增大和磁场作用时间的延长而增加。磁场还能促使非晶区向晶区转变,使结晶尺寸、结晶度和密度均得到提高。
Polyacrylonitrile（PAN） precursor was an important material to produce carbon fiber,however,its microstructure,especially the defects,had a significant effect on the strength of carbon fiber.The precursor was processed in 0T,8T,12T,16T high magnetic fields.The effects of magnetic field on crystal orientation,total orientation,crystal size,crystallinity were studied.The results show that magnetic field can induce the orientation in both crystal and amorphous regions.The orientation increases as the magnetic field intensity strengthens and the same result could be obtained when the processing time extends.Magnetic field can promote the conversion from the amorphous region to the crystal region,resulting at an increase of crystal size,crystallinity and density.Therefore,defects of fiber decreases and the strength of fibers increases.
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