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CHARACTERIZATION OF OXYGEN DISTRIBUTION IN THE CROSS SECTION OF POLYACRYLONITRILE OXIDIZED FIBERS WITH SCANNING TRANSMISSION X-RAY MICROSCOPY
Gao Feng; Zhang Xiangzhi(张祥志); Guo Zhi(郭智); Tai Renzhong(邰仁忠); Zhao Jiang
2011
Source PublicationACTA POLYMERICA SINICA
ISSN1000-3304
Issue8Pages:903
AbstractThe distribution of oxygen element in the cross section of polyacrylonitrile (PAN) precursor fibers and oxidized fibers has been investigated by using a scanning transmission X-ray microscope (STXM) with a spatial resolution of 30 nm,combined with dual-energy contrast imaging method. By using the optical density ratio of the corresponding pixels in the two STXM images, the STXM experimental results indicated that the oxygen is homogeneously distributed in the pristine PAN fibers. During stabilization process, two important reactions occur and change the chemistry of PAN structure. In the skin section of PAN fiber,oxidation converts it into a conjugated and hetero-aromatic structure in the presence of oxygen. While in the core section of PAN fiber,cyclization turns linear PAN into a six-member ring structure due to the absence of oxygen. After treatment, an increase in the oxygen concentration in the skin of the PAN fibers is clearly observed while it remains constant in the core of PAN fibers, clearly demonstrating the diffusion process in the treatment. The propagating velocity of oxygen along the radical direction is about 0.033 mu m/min. This research shows that the STXM is a powerful technique to characterize the internal microstructure of the PAN pre-oxidized fibers, and therefore will help to rationally understand the evaluation mechanism of the skin-core structure.
Indexed BySCI
Language英语
Funding Project应物所项目组
WOS IDWOS:000294090300015
Citation statistics
Document Type期刊论文
Identifierhttp://ir.sinap.ac.cn/handle/331007/12849
Collection中科院上海应用物理研究所2011-2019年
Recommended Citation
GB/T 7714
Gao Feng,Zhang Xiangzhi,Guo Zhi,et al. CHARACTERIZATION OF OXYGEN DISTRIBUTION IN THE CROSS SECTION OF POLYACRYLONITRILE OXIDIZED FIBERS WITH SCANNING TRANSMISSION X-RAY MICROSCOPY[J]. ACTA POLYMERICA SINICA,2011(8):903.
APA Gao Feng,Zhang Xiangzhi,Guo Zhi,Tai Renzhong,&Zhao Jiang.(2011).CHARACTERIZATION OF OXYGEN DISTRIBUTION IN THE CROSS SECTION OF POLYACRYLONITRILE OXIDIZED FIBERS WITH SCANNING TRANSMISSION X-RAY MICROSCOPY.ACTA POLYMERICA SINICA(8),903.
MLA Gao Feng,et al."CHARACTERIZATION OF OXYGEN DISTRIBUTION IN THE CROSS SECTION OF POLYACRYLONITRILE OXIDIZED FIBERS WITH SCANNING TRANSMISSION X-RAY MICROSCOPY".ACTA POLYMERICA SINICA .8(2011):903.
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