论文部分内容阅读
聚丙烯腈(PAN)纤维是生产高性能碳纤维的重要原料。PAN纤维的质量对所得碳纤维的性能有很大的影响。纤维的性能不仅与它的分子结构(化学组分、分子量及其分布以及大分子的支化度等)有密切的关系,而且与纤维中各级超分子结构所形成的织态有密切关系。特别是纤维的织态结构和缺陷将直接影响其物理-机械性能,而PAN纤维纺制的工艺条件又将直接影响纤维中所形成的各级超分子结构。因此,研究PAN纤维织态结构与性能关系具有重要的理论和实际意义。在前一工作中,曾总结了我们用扫描电子显微镜(SEM)研究湿纺法所得到高倍拉伸的PAN纤维的织态结构和
Polyacrylonitrile (PAN) fiber is an important raw material for producing high-performance carbon fiber. The quality of PAN fibers has a great influence on the properties of the resulting carbon fibers. The properties of the fiber are closely related not only to its molecular structure (chemical composition, molecular weight and its distribution, degree of branching of macromolecules, etc.), but also to the texture of the supramolecular structure at all levels in the fiber. In particular, the weave structure and defects of the fibers will directly affect the physical-mechanical properties of the fibers, and the processing conditions of the PAN fibers will directly affect the super-molecular structure at all levels formed in the fibers. Therefore, it is of great theoretical and practical significance to study the relationship between the structure and properties of PAN fibers. In the previous work, we summarized the weave structure of PAN fibers obtained by wet-spinning method and obtained by scanning electron microscopy (SEM)