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A soluble fraction of coal tar pitch (CP) in tetrahydrofuran (THF) was reacted with p-benzoquinone (BQ) at 160 and 180°C and followed by carbonization and graphitization. The reaction and carbonization behavior were monitored in-situ by using differential scanning calorimeter, high-temperature 1H NMR and high-temperature ESR. The reactions of CP and BQ resulted in an increase in molecular weight with...
Naphthalene-derived mesophase pitch (NMP) was chemically modified with p-benzoquinone (BQ) at relatively low temperature, then carbonized and graphitized. An activated Diels-Alder reaction between NMP molecules and BQ occurred at 115°C followed by a dehydration reaction at 158°C. The modified NMP changed its texture from anisotropic to isotropic with increasing BQ concentration. The carbon yield...
Nitrogen enriched pitches prepared catalytically from diazanaphthalenes (quinoxaline (QX), quinazoline (QZ), and phthalazine (PT)) by the aid of AlCl 3 were studied from the viewpoints of the structure and properties of the pitches and their coke due to the different nitrogen locations of starting substrates. The different position of nitrogen in the substrates much influenced the remaining...
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