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
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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.
KeywordsPyrolyzed fuel oil (PFO) Coal tar pitch (CTP) Spinnable isotropic pitch Isotropic pitch-based carbon fiber Bromination–dehydrobromination
This work was supported by the Technology Innovation Program [10082582, Development of petroleum-based high quality mesophase pitch and high yield mesophase pitch for premium carbon materials] funded by the Ministry of Trade, Industry & Energy (MOTIE, Korea).
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Conflict of interest
No potential conflict of interest relevant to this article was reported.
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