STRUCTURAL STUDY OF ASPHALTS BY NUCLEAR MAGNETIC RESONANCE

THE USEFULNESS OF A NUCLEAR MAGNETIC RESONANCE METHOD FOR THE DETERMINATION OF AVERAGE STRUCTURAL FORMULAS AND FORMULA WEIGHTS OF ASPHALTS IS EVALUATED. THE AVERAGE FORMULA WEIGHTS ARE COMPARED TO MOLECULAR WEIGHTS SHOWING FAIR AGREEMENT IN THE MAJORITY OF CASES. THE MORE POLAR FRACTIONS OF ONE ASPHALT HAD MOLECULAR WEIGHTS UP TO THREE TIMES THE FORMULA WEIGHTS, WHILE THE LESS POLAR FRACTIONS HAD MOLECULAR WEIGHTS IN EXCELLENT AGREEMENT WITH FORMULA WEIGHTS. COMPARISON OF AROMATICITY VALUES FROM NUCLEAR MAGNETIC RESONANCE DATA OF ONE ASPHALT AND ITS FRACTIONS WITH DATA FROM OTHER INVESTIGATORS WHO STUDIED THE SAME SAMPLES USING DIFFERENT METHODS SHOWED THE VALIDITY OF THE METHODS USED IN THIS INVESTIGATION. ELUTION BEHAVIOR OF ASPHALT FRACTIONS ON A CHROMATOGRAPHIC COLUMN CORRELATED WITH AROMATICITY AND WITH THE NUMBER OF CONDENSED RINGS PER AVERAGE STRUCTURAL UNIT. /AUTHOR/

  • Supplemental Notes:
    • Vol 6,no 4,PP 231-236
  • Corporate Authors:

    Indus & Eng Chem, Product & Res Dev.

    ,    
  • Authors:
    • Ramsey, J W
    • Mcdonald, F R
    • Petersen, J C
  • Publication Date: 1967-12

Subject/Index Terms

Filing Info

  • Accession Number: 00210704
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jan 24 1994 12:00AM