Air-blowing reactions of pitch: I. Oxidation of aromatic hydrocarbons

Yamaguchi, Chiharu; Mondori, Juji; Matsumoto, Akira; Honma, Hidekazu; Kumagai, Hitoshi; Sanada, Yuzo

doi:10.1016/0008-6223(94)00127-l

Cited by 44 publications

(17 citation statements)

References 18 publications

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“…The absorptions observed at around 1450, 1500, 1580 and 1600 cm À1 are attributed to stretching vibration of C¼C in aromatic rings [46][47][48]. The bands at around 3010-3100 cm À1 are due to aromatic stretching CÀ ÀH vibrations of benzene ring.…”

Section: Resultsmentioning

confidence: 87%

Synthesis and optical properties of σ–π conjugated aluminum-containing polyphenylcarbosilane (Al-PPCS) by hydrosilylation polymerization

Yao

et al. 2015

Synthetic Metals

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Section: Resultsmentioning

confidence: 87%

Synthesis and optical properties of σ–π conjugated aluminum-containing polyphenylcarbosilane (Al-PPCS) by hydrosilylation polymerization

Yao

et al. 2015

Synthetic Metals

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“…Moreover, a new peak around 1700 cm −1 arises in the lines of O‐MCMBs, suggesting the carbonyl groups are introduced in MCMBs by air oxidation . The crosslinking between aromatic molecular layers in MCMBs occurs owing to the combination of carbonyl bonding and other bonding, which facilitates the formation of larger interlayer spacing for OC‐MCMBs in subsequent carbonization, compared with C–MCMBs.…”

Section: Resultsmentioning

confidence: 99%

Enhanced Electrochemical Performance of Mesocarbon‐Microbeads‐Based Anodes through Air Oxidation for Sodium‐Ion Batteries

et al. 2017

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Air oxidation is introduced as a simple and feasible method of modification for mesocarbon microbeads (MCMBs), which improves the electrochemical performance of MCMBs as anodes for sodium‐ion batteries (SIBs). Optimal oxidation conditions are explored. Green MCMBs, initially oxidized at 360 °C then carbonized (OC‐MCMB360), exhibit a high reversible capacity up to 286 mAh g−1 at a current density of 25 mA g−1. In addition, the OC‐MCMB360 sample also presents an excellent rate performance with 79 mAh g−1 at a current density of 3.2 A g−1 and a considerable reversible capacity of 166 mAh g−1 after 100 cycles at 100 mA g−1. The larger interlayer spacing and increased defect sites caused by oxidation contribute to the enhanced electrochemical performance of oxidized MCMBs in SIBs.

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“…Yamaguchi et al 116 modeled the air-blowing reactions to clarify their paths for various model compounds, with 2-3 rings of aromatic hydrocarbons, as starting materials. The air-blowing reactions were followed by ESR, FD-MS, CG-MS, NMR and FT-IR and the authors concluded that when subjected to oxidation in air at 330 ºC, alkyl-substituted aromatic compounds polymerized with methylene, biphenyl-type and ether bonding, leading the methylene to partially change into carbonyl during the air-blowing reaction.…”

Section: Production Aspectsmentioning

confidence: 99%

Anisotropy and mesophase formation towards carbon fibre production from coal tar and petroleum pitches: a review

Castro¹

2006

J. Braz. Chem. Soc.

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A mesofase é o fator determinante para se produzir as propriedades e microestruturas desejadas dos materiais de carbono. A remoção das moléculas mais leves é necessária para sua produção, mas o rendimento pode ser melhorado com a utilização de pressão ou oxidação, antes da remoção das mesmas. Piches anisotrópicos podem ser produzidos através das tradicionais esferas de mesofase de Brooks e Taylor, ricas em resinas α, ou evitando-se as mesmas, através de outras técnicas, como a extração com solventes ou agitação intensa, para gerar, quase que exclusivamente, as resinas β. Piches anisotrópicos, contendo valores próximos a 100% de resinas β, têm sido fiados a temperaturas mais baixas, produzindo fibras de carbono de piche de maior qualidade. Estudos recentes mostraram, experimentalmente, porque os piches exibem comportamentos tão diferentes, no que diz respeito à produção da fibra de carbono, quando suas composições variam em termos de resinas α e β.Mesophase is a key issue to design carbon materials towards its properties and microstructures. The understanding of this intermediate phase has changed since it was first discovered. The removal of light molecules is necessary to produce mesophase, but the yield can be improved if other techniques, such as pressure and oxidation, can be used before they are carried out of the system, with nitrogen or vacuum. Anisotropic pitches can be produced throughout the traditional Brooks and Taylor mesophase spheres, rich in α-resins, or, avoiding them, with other techniques, such as solvent extraction or strong agitation, to generate, almost exclusively, β-resins. Anisotropic pitches exhibiting almost 100% β-resins have been meltspun at lower temperatures, producing pitch carbon fibres of higher quality. Recent studies were able to explain why the behaviour of the pitches is so different, towards the pitch carbon fibre production, when their compositions, in terms of α-resins and β-resins, change.

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Air-blowing reactions of pitch: I. Oxidation of aromatic hydrocarbons

Cited by 44 publications

References 18 publications

Synthesis and optical properties of σ–π conjugated aluminum-containing polyphenylcarbosilane (Al-PPCS) by hydrosilylation polymerization

Synthesis and optical properties of σ–π conjugated aluminum-containing polyphenylcarbosilane (Al-PPCS) by hydrosilylation polymerization

Enhanced Electrochemical Performance of Mesocarbon‐Microbeads‐Based Anodes through Air Oxidation for Sodium‐Ion Batteries

Anisotropy and mesophase formation towards carbon fibre production from coal tar and petroleum pitches: a review

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