Spinnable Mesophase Pitch Prepared via Co-carbonization of Fluid Catalytic Cracking Decant Oil and Synthetic Naphthalene Pitch

Abstract

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Molecular Structure Control in Mesophase Pitch via Co-Carbonization of Coal Tar Pitch and Petroleum Pitch for Production of Carbon Fibers with Both High Mechanical Properties and Thermal Conductivity

“…The anisotropic content of C-MP shown in Figure a is more than 95 vol %, and an elongated anisotropic flow domain texture was observed, which is different from the mosaic textures of coal tar pitch-based mesophase pitches reported in ref . The flow domain texture suggests that C-MP might have good flowability and spinnability. , The C/P-MP and P-MP display larger size flow domain texture and have an anisotropic content over 98 vol %. The widths of about 71, 102, and 125 μm shown in Figure are typical of the anisotropic domain sizes of C-MP, C/P-MP, and P-MP, respectively.…”

“…Researchers usually explain the properties of mesophase pitches through the characterization of their main chemical structure and optical texture features, such as average molecular weight, aromaticity, hydrogen and carbon distribution as well optical texture. The rheological and spinning properties of the mesophase pitches are largely due to the naphthenic structures and alkyl groups of their feedstocks [10,18]. The research papers on comparison/blending of coal-tar and petroleum pitch are mainly focused on the mesophase pitch preparation and their application as graphitizable carbons [19][20][21].…”

“…Researchers usually explain the properties of mesophase pitches through the characterization of their main chemical structure and optical texture features, such as average molecular weight, aromaticity, hydrogen and carbon distribution, as well optical texture. The rheological and spinning properties of the mesophase pitches are largely due to the naphthenic structures and alkyl groups of their feedstocks. , The research papers on comparison/blending of coal-tar and petroleum pitch are mainly focused on the mesophase pitch preparation and their application as graphitizable carbons. − Even though it has practical importance in explaining the effects of precursor chemical structure on carbon fiber properties, few reports look into the molecular irregularity and resulting microcrystalline (im)­perfection of mesophase pitches prepared from differing feedstocks. In our previous work, a spinnable mesophase pitch was prepared from two precursors by taking advantage of both abundant naphthenic structures in synthetic naphthalene pitch and of aliphatic groups in FDO .…”

“…The rheological and spinning properties of the mesophase pitches are largely due to the naphthenic structures and alkyl groups of their feedstocks. , The research papers on comparison/blending of coal-tar and petroleum pitch are mainly focused on the mesophase pitch preparation and their application as graphitizable carbons. − Even though it has practical importance in explaining the effects of precursor chemical structure on carbon fiber properties, few reports look into the molecular irregularity and resulting microcrystalline (im)­perfection of mesophase pitches prepared from differing feedstocks. In our previous work, a spinnable mesophase pitch was prepared from two precursors by taking advantage of both abundant naphthenic structures in synthetic naphthalene pitch and of aliphatic groups in FDO . In order to further reveal the effect of molecular structure and stacking on mesophase pitch texture and derived carbon fiber properties, three kinds of spinnable mesophase pitches were prepared from coal tar pitch, petroleum pitch and their blends, respectively.…”

Constructing the Bridge from Isotropic to Anisotropic Pitches for Preparing Pitch-Based Carbon Fibers with Tunable Structures and Properties

“…The 1 H NMR spectra of the soluble fractions from the NP precursor and its derived SIP and SNPs with two levels of LC content are shown in Figure 3 . According to the well-established Brown–Ladner procedure 35 and previous similar work, 37 , 38 hydrogen located at a chemical shift of 6–10 or 4.5–6 ppm in the 1 H NMR spectrum is assigned to aromatic hydrogen or alkene hydrogen (i.e., hydrogen on a carbon–carbon double bond), hydrogen distributed at a chemical shift of 2–4.5, 1.1–2, and 0.3–1.1 ppm is ascribed to α, β, and γ aliphatic hydrogen, respectively, and the medium-strength peak at a chemical shift of ca. 1.35 ppm is attributed to the naphthenic −CH 2 –.…”