Size exclusion chromatography of aged and crumb rubber modified asphalts
- Western Research Institute, Laramie, WY (United States)
Preparative size exclusion chromatography (SEC) has been used for several years in our laboratory to provide samples for further analysis and for use in other testing procedures. Asphalts have been separated into a first fraction (F-I) that contains nonfluorescing (at 350 nm) materials, and the rest of the asphalt, which is collected in one or more fractions (F-II or F-IIa, F-IIb, etc). The nonfluorescing materials have been shown to contain strongly associating molecules, while the fluorescing materials consist of weakly associating individual and smaller molecules. The fractionation data from these analyses have been related to the theological property tan delta, and thereby, to rutting and premature pavement cracking. We have developed a high performance liquid chromatography (HPLC) technique that yields these analytical data more rapidly and efficiently than preparative SEC and yet gives chromatograms similar to those derived from preparative SEC. The HPLC procedure described here uses toluene as the carrier as does the preparative procedure.
- OSTI ID:
- 430346
- Report Number(s):
- CONF-960807-; ISSN 0569-3772; TRN: 97:000003-0025
- Journal Information:
- Preprints of Papers, American Chemical Society, Division of Fuel Chemistry, Vol. 41, Issue 4; Conference: 212. national meeting of the American Chemical Society (ACS), Orlando, FL (United States), 25-30 Aug 1996; Other Information: PBD: 1996
- Country of Publication:
- United States
- Language:
- English
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