Chemistry of synthesis, structure, preparation and application of aromatic-derived mesophase pitch

Mochida, Isao; Korai, Yozo; Ku, Cha Hun; Watanabe, Fumitaka; Sakai, Yukio

doi:10.1016/s0008-6223(99)00176-1

Cited by 312 publications

(213 citation statements)

References 54 publications

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“…It is well-known that naphthalene-based AR mesophase pitch has been recognized as a most promising precursor for carbon fiber with excellent properties owing to this pitch's unusual physical characteristics, such as high anisotropic content of 100 vol.%, low softening point of ~265 °C, high purity and aromaticity, narrow weight distribution, and it's linear mesogenic species. In addition, the presence of naphthenic groups and aliphatic side chains will undoubtedly favor stable melt-spinning (good flow behavior) and subsequent oxidative stabilization (high crosslinking reactivity with oxygen), compared to conventional mesophases from the thermal polymerization or heat-soaking of natural or industrial pitch [28][29][30].…”

Section: Preparation Of Tape-shaped Pitch Fibersmentioning

confidence: 99%

A comprehensive study on the oxidative stabilization of mesophase pitch-based tape-shaped thick fibers with oxygen

Yuan

Xiong

et al. 2017

Carbon

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Tape-shaped pitch fibers with a transverse cross-sectional size of 400 m width and ~30 m thickness, melt-spun from mesophase pitch, were adopted as a model for treatment in oxygen using various temperatures and durations to investigate their stabilization behavior. Several characterization techniques were used to systematically analyze the functional group species, oxygen content and distribution, local composition, thermal pyrolysis behavior and micro-structural changes in the various stabilized tapes. After oxidative stabilization treatment, the tape-shaped fiber exhibits uniform shrinkage behavior during subsequent heat treatments thereby maintaining its * Corresponding author. E-mail address: xkli8524@sina.com (X. Li) 2 tape shape and structural integrity. The ~30 m thick tapes can be stabilized completely by treatment in oxygen at 220 °C for ~10 h and this indicates a high efficiency of stabilization, which is, perhaps unexpectedly, higher than that of corresponding ~30 m diameter round-shaped fibers. Thermal decomposition pathways varied with the degree of stabilization and have obvious effects on the microstructure of the resulted tapes, which in turn strongly influences their final physical properties. Pitch tapes oxidized under mild conditions offered relatively higher mechanical performance. Tensile strength and Young's modulus of 2500 °C graphitized tapes, previously oxidatively stabilized at 220 °C for 20 h, were measured to be about 2 and 250 GPa, respectively.

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Section: Preparation Of Tape-shaped Pitch Fibersmentioning

confidence: 99%

A comprehensive study on the oxidative stabilization of mesophase pitch-based tape-shaped thick fibers with oxygen

Yuan

Xiong

et al. 2017

Carbon

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“…The sulfur content of the slurry oil pitch reached 1.96%. Sulfur is typically used as a cross-linking agent in the process of producing a mesophase pitch [18].…”

Section: Preparation Of Pitchesmentioning

confidence: 99%

Pitch-based carbon fibers from coal tar or petroleum residue under the same processing condition

Kim¹,

Im²,

Lee³

et al. 2016

Carbon letters

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Spinnable pitches and carbon fibers were successfully prepared from petroleum or coal pyrolysis residues. After pyrolysis fuel oil (PFO), slurry oil, and coal tar were simply filtered to eliminate the solid impurities, the characteristics of the raw materials were evaluated by elemental analysis, 13 C nuclear magnetic resonance spectrometer, matrix-assisted laser desorption/ionization time-of-flight mass spectrometer (MALDI-TOF-MS), and so on. Spinnable pitches were prepared for melt-spinning carbon fiber through a simple distillation under strong nitrogen flow, and further vacuum distillation to obtain a high softening point. Carbon fibers were produced from the above pitches by single-hole melt spinning and additional heat treatment, for oxidization and carbonization. Even though spinnable pitches and carbon fibers were processed under the same conditions, the melt-spinning and properties of the carbon fiber were different depending on the raw materials. A fine carbon fiber could not be prepared from slurry oil, and the different diameter carbon fibers were produced from the PFO and coal tar pitch. These results seem to be closely correlated with the initial characteristics of the raw materials, under this simple processing condition.

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“…In all the three mixes while carrying out the compaction process initially the powder was compacted to an initial pressure of 5 MPa the displacement values of the top punch were recorded. All mixes were compacted at a maximum pressure of 550 MPa with definite increment of pressure and for every pre-set value of these pressures the displacements of the top punch from the initial position are recorded [9,10].…”

Section: Compaction Of Formulations By Die Compaction Experiments Cmentioning

confidence: 99%

Evaluation of Physico-Chemical, Thermal and Mechanical Properties of Sintered Graphite and Mesophase Formulations

G¹,

Sp²

2016

J Material Sci Eng

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Carbon/graphite materials are widely applied to the areas of seal and friction materials. These applications exploit the exceptional properties of carbon/graphite, such as its excellent mechanical behavior at high temperature and low reactivity. However, Owing to high open porosity, and low strength conventional carbon/graphite materials prepared using pulverized coke as filler and pitch as binder fall across enormous challenge. Therefore, it is necessary to reduce the open porosity and increase in the strength along with thermal conductivity. Using natural graphite as filler instead of coke to prepare carbon blocks can avoid high-temperature graphitization and repeated dipping owing to the high degree of graphitization and high thermal stability of natural graphite; thus it can simplify the working process, save energy and reduce cost. Carbonaceous mesophase has inherent properties, such as a high softening point, high fluidity, high carbon yield, and graphitizability, which make it suitable for the fabrication of polygranular carbon materials. Furthermore, it can be used as a binder. The sintering was performed in a static furnace with argon atmosphere and compared with the same compound sintered in passage furnace with hydrogen and nitrogen atmosphere. The analysis of the properties of the tested material was performed with the aid of metallography using a scanning electron microscope, which verified the particle size distribution, chemical elements and pores present. However, for the graphite powder and zinc stearate, present in smaller percentages were disregarded its influence on the physical properties of the compound generated. Compressibility and compaction are parameters that indicate and describe the behavior of metal powders as they are compressed. The ability of a powder densification is related to compressibility. Already compaction is defined as the stability of the structure of the pressed compacted to a certain working pressure. Therefore, the natural graphite as filler and mesophase pitch as binder can be able to produce high density graphite blocks. The main aim of this work is to produce isotropic graphite material and evaluation of its properties such as high density, high thermal conductivity, high electrical resistivity, low coefficient of thermal expansion, and high compressive strength from natural graphite powder mesophase pitch.

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Chemistry of synthesis, structure, preparation and application of aromatic-derived mesophase pitch

Cited by 312 publications

References 54 publications

A comprehensive study on the oxidative stabilization of mesophase pitch-based tape-shaped thick fibers with oxygen

A comprehensive study on the oxidative stabilization of mesophase pitch-based tape-shaped thick fibers with oxygen

Pitch-based carbon fibers from coal tar or petroleum residue under the same processing condition

Evaluation of Physico-Chemical, Thermal and Mechanical Properties of Sintered Graphite and Mesophase Formulations

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