Enhancing the tensile strength of isotropic pitch-based carbon fibers by improving the stabilization and carbonization properties of precursor pitch

Kim, Byung Jun; Kotegawa, Toru; Eom, Youngho; An, Jung-Chul; Hong, Ik Pyo; Katoh, Osamu; Nakabayashi, Koji; Miyawaki, Jin; Kim, Byoung Chul; Mochida, Isao; Yoon, Seong Ho

doi:10.1016/j.carbon.2015.12.082

Cited by 78 publications

(48 citation statements)

References 17 publications

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“…Although a few studies obtained suitable mechanical performance of IPCF using inexpensive raw materials [14], it has still not reached a stage suitable for commercialization. For example, Kim et al reported the successful development of a novel IPCF that has a satisfactory level of tensile properties applicable to CF-reinforced plastics (CFRPs) for car bodies using mixed raw materials of cycled fuel oil and coal tar pitch through a new bromination-dehydrobromination reaction [14][15][16]. In this context, the high price is a major obstacle to adopting CF for CFRP applications for car-body frames.…”

Section: Introductionmentioning

confidence: 99%

Shortening Stabilization Time Using Pressurized Air Flow in Manufacturing Mesophase Pitch-Based Carbon Fiber

Shimanoe

Jeon

et al. 2019

Polymers

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Oxidation–stabilization using pressurized air flows of 0.5 and 1.0 MPa could successfully shorten the total stabilization time to less than 60 min for manufacturing mesophase pitch-based carbon fibers without deteriorating mechanical performance. Notably, the carbonized fiber heat-treated at 1000 °C for 30 min, which was oxidative–stabilized at 260 °C without soaking time with a heating rate of 2.0 °C/min using 100 mL/min of pressurized air flow of 0.5 MPa (total stabilization time: 55 min), showed excellent tensile strength and Young′s modulus of 3.4 and 177 GPa, respectively, which were higher than those of carbonized fiber oxidation–stabilized at 270 °C without soaking time with a heating rate of 0.5 °C/min using 100 mL/min of atmospheric air flow (total stabilization time: 300 min). Activation energies for oxidation reactions in stabilization using pressurized air flows were much lower than those of oxidation reactions using atmospheric air flow because of the higher oxidation diffusion from the outer surface into the center part of pitch fibers for the use of the pressurized air flows of 0.5 and 1.0 MPa than the atmospheric one. The higher oxygen diffusivities resulted in a more homogeneous distribution of oxygen weight uptake across the transverse section of mesophase pitch fibers, and allowed the improvement of the mechanical properties.

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Section: Introductionmentioning

confidence: 99%

Shortening Stabilization Time Using Pressurized Air Flow in Manufacturing Mesophase Pitch-Based Carbon Fiber

Shimanoe

Jeon

et al. 2019

Polymers

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“…CF process techniques consist of fiber spinning, stabilization, and carbonization, and the effects of fiber spinning and thermal processes on fiber structure have been widely investigated. Although previous studies have mostly focused on the stabilization process [4][5][6][7][8], there have been only a few reports focusing on the carbonization process [8][9][10][11]. During the carboniza-flow in a temperature range of 500-1100 o C to compare the effect of the carbonization temperature on the crystallinity of the pitch samples with different forms (fiber and powder).…”

Section: Introductionmentioning

confidence: 99%

Effect of carbonization temperature on crystalline structure and properties of isotropic pitch-based carbon fiber

Kim¹,

Roh²,

Kim³

2017

Carbon letters

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Isotropic pitch-based fibers produced from coal tar pitch with the melt-blowing method were carbonized at temperatures ranging from 800 to 1600 o C to investigate their crystalline structure and physical properties as a function of the carbonization temperature. The in-plane crystallite size (L a ) of the carbonized pitch fiber from X-ray diffraction increased monotonously by increasing the carbonization temperature resulting in a gradual increase in the electrical conductivity from 169 to 3800 S/cm. However, the variation in the d 002 spacing and stacking height of the crystallite (L c ) showed that the structural order perpendicular to the graphene planes got worse in carbonization temperatures from 800 to 1200 o C probably due to randomization through the process of gas evolution; however, structural ordering eventually occurred at around 1400 o C. For the carbonized pitch powder without stabilization, structural ordering perpendicular to the graphene planes occurred at around 800-900 o C indicating that oxygen was inserted during the stabilization process. Additionally, the shear stress that occurred during the melt-blowing process might interfere with the crystallization of the CPF.

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“…It was reported that the ashes could accelerate carbon gasification during the high‐temperature carbonization process, leaving many defects in the carbon fibers, resulting in a decrease in the strength of the fibers . The QI in spinnable pitch adversely affect subsequent polycondensation reactions and spinning property.…”

Section: Resultsmentioning

confidence: 99%

Chemical Modification of Asphaltene with SEBS as Precursor for Isotropic Pitch‐Based Carbon Fiber

Jiang

Shen

2019

ChemistrySelect

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A high yield spinnable pitch for isotropic pitch-based carbon fiber was successfully prepared by air oxidation polycondensation of asphaltene with styrene-ethylene-butylene-styrene. The effects of reaction temperature and time, added styreneethylene-butylene-styrene amount on the composition and spinning properties of resultant pitches were investigated. The resultant pitch with a concentrated molecular weight distribution of 300-700 Da was prepared at 340°C for 3 h under air blowing with 5% styrene-ethylene-butylene-styrene, moreover, its more alkyl structure (mainly methylene), lower apparent viscosity above the softening point, and good spinnability endowed the resultant pitches more prone to oxygen crosslinking during the stabilization process. The average tensile strength of resultant pitch-based carbon fibers was over 800 MPa after carbonization at 1000°C for 10 min. It provided a simple method to adjust the spinnable pitch for pitch-based carbon fiber preparation.

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Enhancing the tensile strength of isotropic pitch-based carbon fibers by improving the stabilization and carbonization properties of precursor pitch

Cited by 78 publications

References 17 publications

Shortening Stabilization Time Using Pressurized Air Flow in Manufacturing Mesophase Pitch-Based Carbon Fiber

Shortening Stabilization Time Using Pressurized Air Flow in Manufacturing Mesophase Pitch-Based Carbon Fiber

Effect of carbonization temperature on crystalline structure and properties of isotropic pitch-based carbon fiber

Chemical Modification of Asphaltene with SEBS as Precursor for Isotropic Pitch‐Based Carbon Fiber

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