Calibration curve for GPC analysis of asphalts
Conference
·
· Am. Chem. Soc., Div. Fuel Chem., Prepr.; (United States)
OSTI ID:6494761
The work reported in this paper shows that it is possible to approach experimentally the problem of the plotting of a calibration curve in molecular weight for gel permeation chromatography (GPC) on a micro-packing applied to the characterization of asphalts. It is shown that if one determines, for different asphalts, a specific calibration curve relating the number average molecular weight, measured by membrane osmometry, of narrow fractions to their elution volume, one obtains a single curve independent of the origin of the crude and of the manufacturing process. This curve is very close to the polystyrene curve for values between about 1000 and 3000. It moves away toward the higher elution volumes, for small molecular weights, owing to the increase in the aromaticity of the asphalt constituents as molecular weight decreases. It also moves away, and in the same direction, as the weight increases: in this case, molecular weight measurements lead to apparent values higher than the real values owing to the non-ideal behavior of the solutions. This difficulty may be overcome by accepting the hypothesis of the applicability of universal calibration to asphalt fractions and by using a viscosimetric detector to plot a new calibration curve with reference to the calibration curve in hydrodynamic volume. The interpretation of the results makes it possible to establish a calibration relationship of the form: log M (asphalt) = 3.21 - 1.04 X + 0.331 X/sup 2/, in which X = log M (polystyrene), and to elucidate, for asphalt fractions, the relationship between intrinsic viscosity and molecular weight.
- Research Organization:
- Laboratoire Central des Ponts et Chaussees, Paris, France
- OSTI ID:
- 6494761
- Report Number(s):
- CONF-810308-(Vol.4)
- Conference Information:
- Journal Name: Am. Chem. Soc., Div. Fuel Chem., Prepr.; (United States) Journal Volume: 26:2
- Country of Publication:
- United States
- Language:
- English
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