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选取碳纤维拉伸强度不同的PAN原丝,通过X射线衍射(XRD)、差示扫描量热仪(DSC)、扫描电镜(SEM)等,对其聚集态结构和形态结构进行了表征。通过分析原丝不同层次结构,建立不同结构与性能之间的关系,并对原丝不同结构对碳纤维强度的影响大小进行了对比。结果表明,结晶度、取向度和致密性是影响碳纤维强度的主要因素,随着晶态结构和取向结构的完善、致密性的提高,碳纤维强度随之增加。但原丝不同结构对碳纤维强度的影响大小是有区别的,从大到小依次为:致密性、取向度、结晶度与微晶尺寸。
PAN precursors with different tensile strengths of carbon fiber were selected and characterized by XRD, DSC and SEM. By analyzing the different strands of the original strands, the relationship between different structures and properties was established, and the influence of different structures of strands on the strength of carbon fibers was compared. The results show that the crystallinity, orientation and compactness are the main factors affecting the strength of carbon fiber. With the improvement of crystal structure and orientation structure, the density of carbon fiber increases with the increase of density. However, the different structure of the original fiber carbon fiber strength is different in size, descending order: density, degree of orientation, crystallinity and crystallite size.