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Description:

Polyacrylonitrile (PAN)-based and pitch-based carbon fibers　exhibit significant anisotropies in the radial and axial directions. Characterizing the anisotropy of the elastic properties of PAN-based and pitch-based carbon fibers is important for carbon fiber research communities. In this present study, the Raman scattering for anisotropy of PAN-based and pitch-based carbon fiber-reinforced plastic (CFRP) samples was investigated. The Raman scattering parameters and ratios in the CFRPs with 0°, 45°, and 90°-sections are related to the tensile modulus. These linear trends for the PAN-based and pitch-based CFRPs with 0°, 45°, and 90°-sections intersect in the range of 400–700 GPa. The change of Raman scattering parameters and ratios of PAN-based and pitch-based carbon fibers and CFRPs with 0°-section are related to the tensile modulus. These linear trends also intersect in the range of 400–700 GPa. The intensity ratios increased with increase in the angle for each CFRPs. The intensity ratio in an arbitrary angle could be estimated using the rule of mixtures and coordinate transfor-mation equations. The Raman anisotropic nature of PAN-based and pitch-based fibers are identified through experimentally and analytically.

Rights:

• Creative Commons BY Attribution 4.0 International
  

Keyword: carbon fiber, Raman; scattering parameter, scattering ratio, anisotropy

Date published: 2025-08-25

Publisher: MDPI AG

Journal:

• Fibers (ISSN: 20796439) vol. 13 issue. 9 114

Funding:

• Acquisition, Technology & Logistics Agency JPJ004596
• New Energy and Industrial Technology Development Organization

Manuscript type: Publisher's version (Version of record)

MDR DOI:

First published URL: https://doi.org/10.3390/fib13090114

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Updated at: 2025-08-28 16:30:28 +0900

Published on MDR: 2025-08-28 16:19:47 +0900