Evolution of the Polycyclic Aromatic Structure in Mesophase Pitch Fibers During Pre‐Oxidation and Its Effect on the Tensile Strength of Carbon Fibers
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2026
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| author | Ke Zhang Huixuan Zhu Shanshan Lv Yutao Liu Lianghua Xu Changqing Li |
| author_facet | Ke Zhang Huixuan Zhu Shanshan Lv Yutao Liu Lianghua Xu Changqing Li Ke Zhang Huixuan Zhu Shanshan Lv Yutao Liu Lianghua Xu Changqing Li |
| collection | Wiley Open Access |
| contents | Evolution of the Polycyclic Aromatic Structure in Mesophase Pitch Fibers During Pre‐Oxidation and Its Effect on the Tensile Strength of Carbon Fibers Ke Zhang Huixuan Zhu Shanshan Lv Yutao Liu Lianghua Xu Changqing Li Journal of Applied Polymer Science ABSTRACT Pre‐oxidation of mesophase pitch fibers generates a thermally stable structure and enables further carbonization at high temperatures to prepare carbon fibers. Elemental analysis, x‐ray photoelectron spectroscopy, Fourier transform infrared, and Raman spectroscopies are employed herein to study the changes in elemental contents and functional groups of fibers pre‐oxidized at 180°C–320°C. Mass spectrometry, thermogravimetry, and scanning electron microscopy are performed to examine the changes in the aromatic structure and morphology caused by pre‐oxidation and their influence on the resulting thermal stability and carbon fiber's tensile strength. As the pre‐oxidation temperature increases, the C and H contents of the fiber decrease, and the O content increases. The methyl, methylene, and aromatic groups form numerous O‐containing functional groups, and the polycyclic aromatic molecules become larger with the increasing pre‐oxidation temperature. The residual C content of the fiber pre‐oxidized below 280°C increases because O is mainly removed by H 2 O, and the C content decreases above 280°C because O is mainly removed by CO 2 during carbonization. The loss of the carbon skeleton in the fibers greatly reduces their mechanical performance. Ultimately, pre‐oxidation between 240°C and 280°C provides the highest thermal stability and tensile strength, where the residual C rate is 91.5% and the tensile strength of the carbon fiber reaches 2.22 GPa. 10.1002/app.70713 http://onlinelibrary.wiley.com/termsAndConditions#vor |
| doi_str_mv | 10.1002/app.70713 |
| format | Artículo Open Access |
| id | wiley_oa_10_1002_app_70713 |
| institution | Wiley Open Access |
| license_str_mv | http://onlinelibrary.wiley.com/termsAndConditions#vor |
| publishDate | 2026 |
| publisher | Wiley |
| record_format | wiley_oa |
| spellingShingle | Evolution of the Polycyclic Aromatic Structure in Mesophase Pitch Fibers During Pre‐Oxidation and Its Effect on the Tensile Strength of Carbon Fibers Ke Zhang Huixuan Zhu Shanshan Lv Yutao Liu Lianghua Xu Changqing Li Journal of Applied Polymer Science Evolution of the Polycyclic Aromatic Structure in Mesophase Pitch Fibers During Pre‐Oxidation and Its Effect on the Tensile Strength of Carbon Fibers Ke Zhang Huixuan Zhu Shanshan Lv Yutao Liu Lianghua Xu Changqing Li Journal of Applied Polymer Science ABSTRACT Pre‐oxidation of mesophase pitch fibers generates a thermally stable structure and enables further carbonization at high temperatures to prepare carbon fibers. Elemental analysis, x‐ray photoelectron spectroscopy, Fourier transform infrared, and Raman spectroscopies are employed herein to study the changes in elemental contents and functional groups of fibers pre‐oxidized at 180°C–320°C. Mass spectrometry, thermogravimetry, and scanning electron microscopy are performed to examine the changes in the aromatic structure and morphology caused by pre‐oxidation and their influence on the resulting thermal stability and carbon fiber's tensile strength. As the pre‐oxidation temperature increases, the C and H contents of the fiber decrease, and the O content increases. The methyl, methylene, and aromatic groups form numerous O‐containing functional groups, and the polycyclic aromatic molecules become larger with the increasing pre‐oxidation temperature. The residual C content of the fiber pre‐oxidized below 280°C increases because O is mainly removed by H 2 O, and the C content decreases above 280°C because O is mainly removed by CO 2 during carbonization. The loss of the carbon skeleton in the fibers greatly reduces their mechanical performance. Ultimately, pre‐oxidation between 240°C and 280°C provides the highest thermal stability and tensile strength, where the residual C rate is 91.5% and the tensile strength of the carbon fiber reaches 2.22 GPa. 10.1002/app.70713 http://onlinelibrary.wiley.com/termsAndConditions#vor |
| title | Evolution of the Polycyclic Aromatic Structure in Mesophase Pitch Fibers During Pre‐Oxidation and Its Effect on the Tensile Strength of Carbon Fibers |
| topic | Journal of Applied Polymer Science |
| url | https://onlinelibrary.wiley.com/doi/10.1002/app.70713 |