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

• Published in: Carbon Letters Vol. 29; no. 2; pp. 193 - 202
• Main Authors: Liu, Jinchang, Shimanoe, Hiroki, Choi, Jong-Eun, Ko, Seunghyun, Jeon, Young-Pyo, Nakabayashi, Koji, Miyawaki, Jin, Yoon, Seong-Ho
• Format: Journal Article
• Language: English
• Published: Singapore Springer Singapore 01.04.2019; Springer Nature B.V; 한국탄소학회
• Subjects: Bromination; By products; Carbon; Carbon fibers; Catalytic cracking; Characterization and Evaluation of Materials; Chemistry and Materials Science; Coal; Coal tar; Distillation; Fibers; Fuel oils; Heating; Materials Engineering; Materials Science; Mechanical properties; Modulus of elasticity; Nanotechnology; NMR; Nuclear magnetic resonance; Oils & fats; Original Article; Oxidation; Oxidation resistance; Pitch (material); Precursors; Pyrolysis; Ratios; Raw materials; Tar; Temperature; Tensile strength; 자연과학일반; Japan; Pyrolyzed fuel oil (PFO); Bromination–dehydrobromination; Coal tar pitch (CTP); Spinnable isotropic pitch; Isotropic pitch-based carbon fiber
• ISSN: 1976-4251; 2233-4998
• DOI: 10.1007/s42823-019-00020-4

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.