This paper describes different procedures applied for the preparation of stabilized fibers from
Avgamasya asphaltite products. Three different methods of solvent extraction, vacuum distillation
of fluidized bed pyrolysis tar, and air blowing of the vacuum distilled products were used in this
study. The asphaltite pitches obtained by different methods are characterized by various
techniques such as elemental analysis, thermogravimetric analysis (TGA and DTG), softening
point (SP), Fourier transform infrared spectroscopy (FT-IR), and solution 1H and 13C nuclear
magnetic resonance (NMR) spectroscopy. Structural characterization by elemental analysis, FT-IR, and nuclear magnetic resonance spectroscopy on both vacuum-distilled and air-blown pitches
showed that distillation of lighter fractions, reduction of atomic H/C ratio, and dehydrogenation
raised their softening points. Structural analysis by NMR showed that asphaltite pitches consist
of condensed aromatic rings combined with methylene bridges and heterocyclic groups, and
substituted with alkyl and naphthenic groups. Asphaltite pitches which were prepared by solvent
extraction (HI−BS) and vacuum distillation (AVD3) resulted in very good and medium spinnable
green fibers, respectively. On the other hand, air-blown pitches could not be spun. The morphology
of the stabilized fibers was studied by scanning electron microscopy (SEM).
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