摘要
Kevlar纤维是近年来发展起来的合成纤维中性能最为优异的一种有机合成纤维,它具有超高的模量和强度。纤维的性能往往是由在成纤过程中所形成的超分子结构所决定的,因而研究这种纤维的形态结构是一个很有兴趣的课题。本工作用氩离子蚀刻技术和扫描电子显微镜观察相结合,详细地研究了Kevlar纤维的表面结构,纵向剖面和横断面的形态结构。结果发现Kevlar纤维中存在有两种水平的结构单元:晶粒层和微纤结构,其中晶粒是组成微纤维结构的基本单元,而表现宏观力学性能的结构单元是微纤维结构。最后作者提出了一个结构模型来解释Kevlar纤维的结构和性能的关系。
Kevlar-49 fiber is one of the organic synthesis fibers with ultra high modulum and stren-gth. It has been used as an important structural material in space navigating industry. The pr-operty of the fiber will be strongly depended on the morphological structure formed in proc-essing. The combination of ion etching and SEM techniques have been used in the present study to characterize the morphological structures of Kevlar fiber with surface, longitudinal section and transversal section. Our experimental results show that the Kevlar-49 fiber posse-sses two different level structural units: crystallite and fibril which made from the crystalli-tes, and the fibrils may control the strength of the fiber in the axial direction, A model is suggested to explain the relationship the structures and the properties of Kevlar-49 fiber.
出处
《电子显微学报》
CAS
CSCD
1989年第1期6-10,共5页
Journal of Chinese Electron Microscopy Society
