Abstract
«Average structure» data for coal-tar and petroleum (Ashland A-240) pitches are reported, based on NMR spectroscopy combined with elemental and molecular weight analyses. The average structure of both coal-tar and A-240 pitches indicates that they have similar sized aromatic units. The major difference is the much higher degree of aromatic substitution in petroleum pitch. The «average» petroleum pitch molecule contains two methyl and one ethyl group, with one in two molecules containing a ring-joining methylene group. However, the average coal-tar pitch molecule contains only one methyl and one ring-joining methylene group for every two molecules
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
