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WANG Yun-Feng, WANG Yi-Wei, XU Liang-Hua, WANG Yu. Regulating the radial structure during pre-oxidation of polyacrylonitrile fibers and its effect on the mechanical properties of carbon fibers[J]. NEW CARBOM MATERIALS. doi: 10.1016/S1872-5805(20)60516-9
Citation: WANG Yun-Feng, WANG Yi-Wei, XU Liang-Hua, WANG Yu. Regulating the radial structure during pre-oxidation of polyacrylonitrile fibers and its effect on the mechanical properties of carbon fibers[J]. NEW CARBOM MATERIALS. doi: 10.1016/S1872-5805(20)60516-9

Regulating the radial structure during pre-oxidation of polyacrylonitrile fibers and its effect on the mechanical properties of carbon fibers

doi: 10.1016/S1872-5805(20)60516-9
Funds:  The Joint Fund of the Ministry of Education for Pre-research (6141A02033231 and 6141A02033223), the Fundamental Research Funds for the Central Universities (JD2012) and the Basic Research Plan (JCKY2018110C139)
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  • Author Bio:

    WANG Yun-Feng, Master student. E-mail:

  • Corresponding author: XU Liang-Hua, Assistant professor. E-mail: xulh@mail.buct.edu.cn; WANG Yu, Assistant professor. E-mail: wangy@mail.buct.edu.cn
  • Received Date: 2019-11-30
  • Rev Recd Date: 2019-11-30
  • Available Online: 2021-02-05
  • The radial structure of pre-oxidized fibers and its distribution directly affect the performance of the resulting carbon fibers. Optimizing the radial distribution of pre-oxidized structure and establishing the relationship between the pre-oxidized structure of polyacrylonitrile fibers and the mechanical properties of the final carbon fibers will help to optimize the pre-oxidation conditions in the preparation of high-performance carbon fibers. Herein, solid-state nuclear magnetic resonance spectroscopy, optical microscopy, thermogravimetric analysis, and mechanical tests were used to investigate the effect of the pre-oxidation reaction rate on the radial structural distribution of pre-oxidized fibers and the mechanical properties of the resulting carbon fibers. The pre-oxidation reaction rates were controlled by regulating the pre-oxidation temperature gradient. The results showed that the pre-oxidation degree of pre-oxidized fibers increased with both the overall and initial rates of pre-oxidation. With increasing the overall pre-oxidation reaction rate, the pre-oxidized structure was deepened into the core region of the fibers, the content of oxygen-containing functional groups increased, the thermal stability of the fibers decreased, the graphitization degree of the corresponding carbon fibers increased, but the density of the carbon fibers decreased and the mechanical properties of the carbon fibers were degraded. With increasing the initial reaction rate of pre-oxidation, the radial distribution of the pre-oxidation structure was effectively improved, the content of oxygen-containing functional groups of the pre-oxidized fibers increased slightly, their thermal stability was improved, the degree of graphitization and density of the final carbon fibers increased, and the tensile strength and tensile modulus of the final carbon fibers were markedly increased. A new type of carbon fibers with high strength, medium modulus and a relatively large diameter was obtained under the optimized pre-oxidation conditions.
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