| Evolution of microvoids in pan-based carbon fibers | |
| Li Den-hua1,2; Wu Gang-ping1; Lu Chun-xiang1; Li Yong-hong1; He Fu1; Feng Zhi-hai3; Li Xiu-tao3; Guo Yu-ming3 | |
| 刊名 | New carbon materials
 |
| 2010-02-01 | |
| 卷号 | 25期号:1页码:41-47 |
| 关键词 | Carbon fibers Microvoids Fractal dimension Small angle x-ray scattering |
| ISSN号 | 1007-8827 |
| 通讯作者 | Lu chun-xiang(lucx@sxicc.ac.cn) |
| 英文摘要 | Microvoids, formed in spinning, oxidation and carbonization during the preparation of pan-based carbon fibers, were investigated by two-dimensional small angle x-ray scattering. results indicated that microvoids in pan fibers had a preferred elongation and orientation along the fiber axis with an average length of 24.3 nm, diameter of 19.2 nm and aspect ratio of around 1.27. the size of the microvoids remained almost unchanged during oxidation, while their aspect ratio increased to 1.85, possibly due to a crystalline transformation from a linear structure in pan fibers to a heat-resistant ladder structure in oxidized fibers. however, the size of the microvoids decreased dramatically to about 3.56 nm in the long axis and 2.85 nm in the short axis during carbonization. the surface fractal dimension (ds) increased in these processes from 2.42 to 2.88 and the most severe change occurred in low-temperature carbonization, indicating that surface roughness increased during processing, and carbonization was the most important process for such a transformation. |
| WOS关键词 | X-RAY-SCATTERING ; OXIDATIVE STABILIZATION ; FRACTAL PROPERTIES ; POROSITY ; SURFACE ; SOLIDS |
| WOS研究方向 | Materials Science |
| WOS类目 | Materials Science, Multidisciplinary |
| 语种 | 英语 |
| 出版者 | SCIENCE PRESS |
| WOS记录号 | WOS:000274776800007 |
| 内容类型 | 期刊论文 |
| URI标识 | http://www.corc.org.cn/handle/1471x/2411913 |
| 专题 | 中国科学院大学 |
| 通讯作者 | Lu Chun-xiang |
| 作者单位 | 1.Chinese Acad Sci, Inst Coal Chem, Key Lab Carbon Mat, Taiyuan 030001, Peoples R China 2.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China 3.China Acad Launch Vehicle Technol, China Aerosp Sci & Technol Corp, Aerosp Res Inst Mat & Proc Technol, Beijing 100076, Peoples R China |
| 推荐引用方式 GB/T 7714 | Li Den-hua,Wu Gang-ping,Lu Chun-xiang,et al. Evolution of microvoids in pan-based carbon fibers[J]. New carbon materials,2010,25(1):41-47. |
| APA | Li Den-hua.,Wu Gang-ping.,Lu Chun-xiang.,Li Yong-hong.,He Fu.,...&Guo Yu-ming.(2010).Evolution of microvoids in pan-based carbon fibers.New carbon materials,25(1),41-47. |
| MLA | Li Den-hua,et al."Evolution of microvoids in pan-based carbon fibers".New carbon materials 25.1(2010):41-47. |
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