2D SAXS/WAXD ANALYSIS OF PAN CARBON FIBER MICROSTRUCTURE IN ORGANIC/INORGANIC TRANSFORMATION

Cai-zhen Zhu; Xiao-lan Yu; Xiao-fang Liu; Yun-zen Mao; Rui-gang Liu; Ning Zhao; Xiao-li Zhang; Jian Xu

doi:10.1007/s10118-013-1272-1

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2D SAXS/WAXD ANALYSIS OF PAN CARBON FIBER MICROSTRUCTURE IN ORGANIC/INORGANIC TRANSFORMATION

Special Issue: In Honor of the 80th Birthday of Professor Fosong Wang (Part I) | Updated：2023-01-03

- 2D SAXS/WAXD ANALYSIS OF PAN CARBON FIBER MICROSTRUCTURE IN ORGANIC/INORGANIC TRANSFORMATION
- Chinese Journal of Polymer Science Vol. 31, Issue 5, Pages: 823-832(2013)
- Affiliations：
  
  a.Beijing National Laboratory for Molecular Sciences, Laboratory of Polymer Physics and Chemistry, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
  b.ShenZhen Key Laboratory of Functional Polymer, College of Chemistry and Chemical Engineering, Shenzhen University, Shenzhen 518060, China
  c.College of Materials Science and Engineering, Donghua University, Shanghai 201620, China
- Author bio：
  
  Ning Zhao (赵宁), E-mail: zhaoning@iccas.ac.cn
  **Jian Xu (徐坚), E-mail: jxu@iccas.ac.cn;
- Funds：
- DOI：10.1007/s10118-013-1272-1
  CLC：
- Received：26 December 2012，
  
  Revised：2013-01-25，
  
  Accepted：31 January 2013，
  
  Published：2013-05
- Accepted：
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Cai-zhen Zhu, Xiao-lan Yu, Xiao-fang Liu, et al. 2D SAXS/WAXD ANALYSIS OF PAN CARBON FIBER MICROSTRUCTURE IN ORGANIC/INORGANIC TRANSFORMATION[J]. Chinese Journal of Polymer Science, 2013, 31(5): 823-832.
DOI：

Cai-zhen Zhu, Xiao-lan Yu, Xiao-fang Liu, et al. 2D SAXS/WAXD ANALYSIS OF PAN CARBON FIBER MICROSTRUCTURE IN ORGANIC/INORGANIC TRANSFORMATION[J]. Chinese Journal of Polymer Science, 2013, 31(5): 823-832. DOI： 10.1007/s10118-013-1272-1.

摘要

Abstract

Structure of PAN fibers during pre-oxidation and carbonization was studied using two dimensional small angle X-ray scattering/wide angle X-ray diffraction (2D SAXS/WAXD). The SAXS results show that during pre-oxidation between 180℃ and 275℃

the volume content of microvoids increases with the temperature increasing

which may be one of reasons for the decrease of tensile strength of pre-oxidized fibers. 253℃ was the critical transition temperature

the length

diameter

aspect ratio and orientation distribution of microvoids increased with temperature before this temperature and decreased after this temperature. After the high temperature carbonization

lots of spindly microvoids formed. WAXD patterns demonstrate that the crystallite size of PAN fibers first increased before 230℃ and then decreased with the increase of temperature during the pre-oxidation. The diffraction peak of PAN fibers at 2

≈ 17° almost disappeared at the end of preoxidation while the diffraction peak of aromatic structure at 2

≈ 25° appeared at 253℃. During carbonization

the peak intensity at 2

≈ 25° increased apparently due to the formation of graphite structure. The results obtained give a deep understanding of the microstructure development in the PAN fibers during pre-oxidation and carbonization

which is important for the preparation of high performance carbon fibers.

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