Microstructure of transverse ultrathin sections cut from polyacrylonitrile(PAN) precursor fibers and preoxidized fibers were examined by high-resolution transmission electron microscopy(HRTEM).

• 采用高分辨透射电子显微镜(HRTEM)研究了聚丙烯腈原丝和预氧丝横截面超薄切片的微观组织,揭示了预氧化过程中原丝组织结构的演变机理。