一、前言为了提高我国聚丙烯长丝质量,有人用扫描电镜和透射电镜对聚丙烯腈长丝的形态缺陷进行了一些研究工作。实验结果表明,我国目前生产的聚丙烯腈长丝的表皮和内部尚存在着不同类型的杂质和形态缺陷,从而降低了由它们制备的碳纤维的机械性能,并使其抗张强度值的离散率增大。因此对于聚丙烯腈长丝表皮杂质以及形态缺陷的考察 I. Preface In order to improve the quality of polypropylene filament in China, some researches have been done on the morphological defects of polyacrylonitrile filament by scanning electron microscopy and transmission electron microscopy. The experimental results show that the polyacrylonitrile filaments currently produced in China have different types of impurities and morphological defects in the epidermis and the interior, so as to reduce the mechanical properties of the carbon fibers prepared therefrom and to make the dispersion ratio of the tensile strength value Increase. Therefore, polyacrylonitrile filaments epidermal impurities and morphological defects inspection