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CHARACTERIZATION OF OXYGEN DISTRIBUTION IN THE CROSS SECTION OF POLYACRYLONITRILE OXIDIZED FIBERS WITH SCANNING TRANSMISSION X-RAY MICROSCOPY
Gao Feng1; Zhang Xiangzhi2; Guo Zhi2; Tai Renzhong2; Zhao Jiang1
2011-08-20
Source PublicationACTA POLYMERICA SINICA
ISSN1000-3304
Issue8Pages:903-907
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.
KeywordPan Fibers Stabilization Oxidation Scanning Transmission X-ray Microscope Microstructure
DOI10.3724/SP.J.1105.2011.1168
Indexed BySCI
Language英语
WOS IDWOS:000294090300015
PublisherSCIENCE PRESS
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Document Type期刊论文
Identifierhttp://ir.iccas.ac.cn/handle/121111/73320
Collection中国科学院化学研究所
Corresponding AuthorGao Feng
Affiliation1.Chinese Acad Sci, Inst Chem, Joint Lab Polymer Sci & Mat, Beijing Natl Lab Mol Sci, Beijing 100190, Peoples R China
2.Chinese Acad Sci, Shanghai Inst Appl Phys, Shanghai 201204, Peoples R China
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):903-907.
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),903-907.
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):903-907.
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