EFFECT OF FIBER MICROSTRUCTURE UPON THE MODULUS OF PAN-AND PITCH-BASED CARBON-FIBERS
EFFECT OF FIBER MICROSTRUCTURE UPON THE MODULUS OF PAN-AND PITCH-BASED CARBON-FIBERS
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DOI：
10.1016/0008-6223(94)00109-d
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发表时间：
1995-01-01
期刊：
影响因子：
10.9
通讯作者：
YOUNG, RJ
中科院分区：
文献类型：
--
作者：
HUANG, Y;YOUNG, RJ
详细研究了聚丙烯腈（PAN）和沥青基碳纤维的结构与力学性能之间的关系。对碳纤维变形的拉曼光谱研究表明，对于PAN和中间相沥青基纤维，单位应变的拉曼能带位移率随着纤维的杨氏模量线性增加。然而，pan基纤维的位移速率几乎是相同杨氏模量的中间相沥青基纤维的两倍。为了理解这种差异，研究人员使用扫描和透射电子显微镜以及拉曼光谱等综合技术对两种纤维的微观结构进行了检查。结果表明，聚丙烯腈基纤维的皮芯存在明显的差异，在皮区有更多的高取向和较大的晶体，而在芯区有较少取向和较小的晶体。相反，中间相沥青基纤维在纤维的微观结构上几乎没有变化。pan基纤维的表皮比芯材具有更高的模量。在变形过程中，在相同的总应变水平下，这导致纤维表面的拉曼带位移比纤维芯的拉曼带位移更大。
The relationship between the structure and mechanical properties of both polyacrylonitrile (PAN)-and pitch-based carbon fibres has been studied in detail. Raman spectroscopic studies on the deformation of carbon fibres have shown that the rates of Raman band shift per unit strain, for both PAN- and mesophase pitch-based fibres, increase linearly with Young's modulus of the fibres. The shift rate for PAN-based fibres, however, was found to be almost twice that of mesophase pitch-based fibres of the same Young's modulus. To understand this difference, the microstructure of both types of fibre was examined using a combination of techniques, including scanning and transmission electron microscopy and Raman spectroscopy. The results demonstrate that there is a profound skin-core difference in PAN-based fibres, with more highly oriented and larger crystallites in the skin region, and less oriented and smaller crystallites in the core. In contrast, the mesophase pitch-based fibres show little change in microstructure across the fibre. The skin of the PAN-based fibres has a higher modulus than the core material. During deformation, this gives rise to a larger Raman band shift in the skin on the fibre than in the core, at the same level of overall strain.