Effect of different oxidation treatments on the chemical structure and properties of commercial coal tar pitch

Petrová, B.; Budinova, T.; Petrov, N.; Yardim, M. Ferhat; Eki̇nci̇, Ekrem; Razvigorova, M.

doi:10.1016/j.carbon.2004.09.006

Cited by 67 publications

(37 citation statements)

References 6 publications

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“…A similar trend was observed by Petrova et al [12] for oxidation treatment of coal-tar pitch by different acidic stabilization agents. This implies the occurrence of various types of the reactions during the stabilization process.…”

Section: Ftir Spectroscopysupporting

confidence: 88%

“…Stabilization, as reported in the literature [8][9][10][11][12], is attempted in order to increase the yield of pitches and pitch based matrix precursors by oxygen diffusion and cross linking thereafter. The yield increases with oxygen mass gain (OMG).…”

Section: Characterization Of Sp Samplesmentioning

confidence: 99%

“…They found that the TGA bulk yield of the pitch increases up to 5 h stabilization duration and then started decreasing after 5 h, whereas in our case the TGA bulk yield continue to increase with stabilization duration up to 20 h and then only started decreasing after 20 h. The main reason behind the drop in the TGA bulk yield beyond 5 h stabilization, as reported by Manocha et al [11], is the possibility of the reaction of oxygen with carbon leading to removal of elemental carbon. http://carbonlett.org ing point with OMG is accompanied by structural change of the matrix precursor by the formation of more condensed aromatic units and conversion of lighter fractions of the pitch into heavier fractions [12]. Beyond an OMG of 4.6%, the softening point was not detected in the softening point apparatus or in differential scanning calorimetry (DSC).…”

Section: Ftir Spectroscopymentioning

confidence: 99%

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Yield enhancement of matrix precursor in short carbon fiber reinforced randomly oriented carbon/carbon composite

Raunija¹,

Verma²

2016

Carbon letters

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Isroaniso matrix precursor synthesized from commercially available petroleum pitch was stabilized in air. The influence of oxygen mass gain during stabilization on the yield of matrix precursor was studied. Additionally, the influence of pressure on the yield of the stabilized matrix precursor in a real system was studied. The fourier transform infrared spectrometry (FTIR), thermogravimetric analysis (TGA), yield, yield rate, and yield impact were used to check the effect of stabilization and pressure on the yield of the matrix precursor and the end properties of the composite thereafter. The results showed that the yield increased with stabilization duration up to 20 h whereas it decreased for stabilization duration beyond 20 h. Further results showed that the stabilized matrix precursor for a duration of 5 h could withstand almost two-fold greater hot-pressing pressure without resulting in exudation as compared to that of a 1 h stabilized matrix precursor. The enhanced hot-pressing pressure significantly improved the yield of the matrix precursor. As a consequence, the densification and mechanical properties were increased significantly. Further, the matrix precursor stabilized for a duration of 20 h or more failed to provide proper and uniform binding of the reinforcement.

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Section: Ftir Spectroscopysupporting

confidence: 88%

Section: Characterization Of Sp Samplesmentioning

confidence: 99%

Section: Ftir Spectroscopymentioning

confidence: 99%

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Yield enhancement of matrix precursor in short carbon fiber reinforced randomly oriented carbon/carbon composite

Raunija¹,

Verma²

2016

Carbon letters

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“…However, with treatment at high temperatures, isotropic CTP usually generates mesophase particles. To control the generation of a meso-phase, various methods have been used such as acid treatments to reduce reaction temperatures [5], and adding polymers to reduce or increase meso-phase formation [11][12][13]. Isotropic CTP is less costly than meso-phase CTP or PAN because of its low temperature manufacturing conditions.…”

Section: Introductionmentioning

confidence: 99%

“…Since CTP consists of a variety of different phenols and polycyclic aromatic hydrocarbons [1,2], it must be properly treated to obtain spinnable pitches. In order to achieve lower price and high performance pitch carbon fiber, CTP has been restructured by purifying processes [3,4], thermal and acid treatments [5], air blowing [6][7][8][9], thermal treatment [10], and modification with a polymer [11][12][13]. These treatments affect the properties of the carbon fiber precursor because they cause a considerable change in the chemical composition of pitches.…”

Section: Introductionmentioning

confidence: 99%

Modification of isotropic coal-tar pitch by acid treatments for carbon fiber melt-spinning

Yoo¹,

Ko²,

Lim³

et al. 2014

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In this work, thermal treatment accompanied with different acid treatments was applied to a commercial coal tar pitch (CTP) to obtain a spinnable precursor pitch for carbon fiber. In the case of thermal treatment only, a relatively high reaction temperature of between 380°C and 400°C was required to obtain a softening point (SP) range of 220°C-260°C and many meso-phase particles were created during the application of high reaction temperature. When nitric acid or sulfuric acid treatment was conducted before the thermal treatment, the precursor pitch with a proper SP range could be obtained at reaction temperatures of 280°C-300°C, which were about 100°C lower than those for the case of thermal treatment only. With the acid treatments, the yield and SP of the precursor pitch increased dramatically and the formation of meso-phase was suppressed due to the lower reaction temperatures. Since the precursor pitches with acid and thermal treatment were not spinnable due to the inhomogeneity of properties such as molecular weight distribution and viscosity, the CTP was mixed with ethanol before the consecutive nitric acid and thermal treatments. The precursor pitches with ethanol, nitric acid, and thermal treatments were easily spinnable, and their spinning and carbon fiber properties were compared to those of air blowing and thermal treated CTP.

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Effects of the molecular structure from pitch fractions on the properties of pitch‐based electrospun nanofibers

Zhang

Yang

et al. 2021

J of Applied Polymer Sci

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Mesophase pitch was separated into different pitch fractions to investigate the effect of pitch fractions on the properties of their nanofibers prepared by electrospinning. The evolution of different pitch fractions‐derived nanofibers during stabilization and carbonization were explored, and the properties of the resultant carbon nanofibers (CNFs) as electrode materials for supercapacitor were compared. Results indicated that the hexane insoluble‐toluene soluble (HI‐TS) and toluene insoluble‐tetrahydrofuran (THF) soluble (TI‐THFS) fractions had good spinnability due to their narrow molecular weight distribution. Moreover, compared with HI‐TS and THF insoluble (THFI), TI‐THFS consisted of appropriate aromaticity and branched alkyl groups which promoted the stabilization and carbonization behaviors of its nanofibers, resulting in maintaining ideal fiber morphology of TI‐THFS‐derived nanofiber due to the mitigation of their exothermic reactions. Meanwhile, the TI‐THFS‐derived CNFs presented the highest surface area of 543 m2 g−1 and exhibited an excellent specific capacitance of 167 F g−1 at 0.5 A g−1 in 6 M KOH electrolyte.

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Effect of different oxidation treatments on the chemical structure and properties of commercial coal tar pitch

Cited by 67 publications

References 6 publications

Yield enhancement of matrix precursor in short carbon fiber reinforced randomly oriented carbon/carbon composite

Yield enhancement of matrix precursor in short carbon fiber reinforced randomly oriented carbon/carbon composite

Modification of isotropic coal-tar pitch by acid treatments for carbon fiber melt-spinning

Effects of the molecular structure from pitch fractions on the properties of pitch‐based electrospun nanofibers

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