1972 Volume 51 Issue 3 Pages 162-171
As for a study on the coking property of asphalts and pitches, the characteristics of their bitumens were in the first place pursued. The straight asphalt was seperated into four components. IR- and NMR- spectra of the carbon disulfide soluble portion of asphalts, fractions and pitches were compared. Then, using the hydrogen distribution data from the NMR spectra, elemtary analysis and molecular weight, the structural parameters were estimated.
The aromaticity of the asphalts was low and not polycondensed. The degree of aromatic substitution of the asphalts was high value comparing with the pitches. From the data by thermogravimetric method, the coking residue was mainly obtained from poly-condensed aromatic compounds.
