PAN原丝和预氧化丝在强磁场下的碳化性能

Carbonization Performance of PAN Precursor and Pre-oxidized Fiber in Strong Magnetic Field

采用磁场强度为12T(恒定磁场)的强磁场对PAN(聚丙烯腈)原丝和在280℃下进行氧化的预氧化丝分别进行了30min的诱导取向。结果发现,强磁场能够使PAN原丝的取向结构特别是非晶区的取向结构得到改善,提高其预氧化速率,使低强度单丝得到补强从而减少碳纤维强度分散度,但对于碳纤维整体强度的提高作用不明显;强磁场对预氧化丝的处理能够增大碳纤维的结晶尺寸,不仅能够减少强度分散度,而且能够提高碳纤维的整体强度。

PAN precursor and 280℃pre-oxidized fiber were induced to align for 30 min under 12 T srong magnetic field, respectively. The results showed that strong magnetic field can improve the orientation slructure of PAN precursor and the amorphous area was more sensitive to strong magnetic field. It can also accelerate the pre oxidization reaction rate. It could strengthen the weak filament effectively and reduce the degree of dispersion of strength, but has little effect on the overall strength. The strong magnetic field could increase the crystal size when 280℃ pre-oxidized fiber was treated. The result showed that not only the degree of dispersion of strength reduced, but also the carbon fiber overall strenglh increased.