Studies on “Mesophase”-Pitch-Based Carbon Fibers

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Abstract
The structure and textures in different scales of so-called “mesophase”-pitch-based carbon fibers spun from the same anisotropic precursor pitch were studied with highresolution transmission electron microscopy (TEM), high-fidelity scanning electron microscopy (SEM), X-ray powder diffractometry (XRD), and magnetoresistance (Δρ/ρ) measurement. The texture were identified to be radial with open wedge, radial, doubly-textured and concentric by SEM. Results on XRD and (Δρ/ρ) measurements indicate that the fiber with radial texture with open wedge gives the highest graphitization degree by heat treatment at 3000°C. Under TEM two regions with different textures in micrometric scale, random and oriented regions, were observed, being changed by high temperature treatment to microporous non-graphitized and graphitized regions, respectively. The experimental results on the measurements of XRD and (Δρ/ρ) on the graphitized fibers were explained by the existence of these two regions with different textures.

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