Pitch precursors affording excellent spinnability, high-level oxidation-resistance, and good carbonization yields were prepared by bromination–dehydrobromination of various ratios of pyrolyzed fuel oil and coal tar pitch. The pitches exhibited spinnabilities that were much better than those of pitches prepared via simple distillation. A pitch prepared using a 1:2 ratio of fuel oil and coal tar pitch exhibited the best tensile strength. Pitch fibers of diameter 8.9 ± 0.1 μm were stabilized at 270 °C without soaking time after heating at a rate of 0.5 °C/min and carbonized at 1100 °C for 1 h after heating at 5 °C/min. The resulting carbon fibers exhibited a tensile strength, elongation, Young’s modulus, and average diameter of 1700 ± 170 MPa, 1.6 ± 0.1%, 106 ± 37 GPa, and 7.1 ± 0.2 μm, respectively.

Effect of the pre-treated pyrolysis fuel oil: coal tar pitch ratio on the spinnability and oxidation properties of isotropic pitch precursors and the mechanical properties of derived carbon fibers
    Abstract
    1 Introduction
    2 Experimental
        2.1 Raw materials and preparation of isotropic pitch precursors
        2.2 Stabilization and carbonization
        2.3 Characterization
    3 Results and discussion
        3.1 Analytical data on PFO, PFOp, and CTP
        3.2 Isotropic pitch precursors
        3.3 Melt spinnability
        3.4 Oxidative stabilization of pitch fibers
    4 Conclusions
    Acknowledgements 
    References

• Jinchang Liu(Interdisciplinary Graduate School of Engineering Sciences, Kyushu University)
• Hiroki Shimanoe(Interdisciplinary Graduate School of Engineering Sciences, Kyushu University)
• Jong‑Eun Choi(Center for C-Industry Incubation Korea Research Institute of Chemical Technology (KRICT)/Advanced Materials and Chemical Engineering, University of Science and Technology (UST))
• Seunghyun Ko(Center for C-Industry Incubation Korea Research Institute of Chemical Technology (KRICT))
• Young‑Pyo Jeon(Center for C-Industry Incubation Korea Research Institute of Chemical Technology (KRICT)/Advanced Materials and Chemical Engineering, University of Science and Technology (UST))
• Koji Nakabayashi(Interdisciplinary Graduate School of Engineering Sciences, Kyushu University/Institute for Materials Chemistry and Engineering, Kyushu University)
• Jin Miyawaki(Interdisciplinary Graduate School of Engineering Sciences, Kyushu University/Institute for Materials Chemistry and Engineering, Kyushu University)
• Seong‑Ho Yoon(Interdisciplinary Graduate School of Engineering Sciences, Kyushu University/Institute for Materials Chemistry and Engineering, Kyushu University)