中文摘要：

PAN原丝的预氧化性能是决定碳纤维性能的重要指标。对P300和P700两种不同原丝在强度分别为4、8、12和16 T的磁场中进行了处理,并对处理后的原丝进行了预氧化。采用XRD、FTIR、DSC和密度法分别对预氧化纤维的预氧化程度进行了表征,结果发现磁场会引起原丝分子链段的取向排列和结晶度的提高,从而降低原丝的预氧化性能,其影响程度随着磁场强度的增大而增强。结晶和取向度较低的原丝更易于受到磁场影响。

英文摘要：

Pre-oxidization property of PAN precursor is the key factor to determine the performance of carbon fiber.In this study,two kinds of precursors,P300 and P700,were treated in high magnetic fields of 4,8,12,16 T respectively,after then,the obtained samples were pre-oxidized.The pre-oxidization degrees of precursors were characterized by XRD,FTIR,DSC and density method.The results showed that,magnetic field can induce alignment of chain segments and increase crystallinity.That could reduce pre-oxidization degree of precursors and the influence degree increased with the enhancement of magnetic field intensity.Precursors of lower crystallinity and orientation were more likely to be influenced by magnetic field.