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- W278415083 abstract "One important facet of the characterization of coal derived materials is that of molecular weight determination. Number average molecular weight is usually obtained by vapor pressure osmometry measurements. However, no satisfactory method is available for determining weight average molecular weights. The latter values are useful in predicting rheological properties. Gel permeation chromatography (GPC) is a technique which should be most readily adaptable for this measurement. The other techniques of ultracentrifugation and light scattering are not as readily available as GPC. At this time, satisfactory calibration standards which possess chemical structures similar to coal derived materials are non-existent. The purpose of this study is to develop a useful set of GPC calibration standards for asphaltene and preasphaltene analyses. Our previous results suggest models in which coal derived preasphaltenes and asphaltenes are composed of oligomeric aromatic ethers of both diaryl and furan types. We plan to synthesize a series of model oligomers that are in agreement with the average structural formulas of some selected coal preasphaltenes as determined by pmr, elemental analyses and various oxygen derivatization procedures. These model compounds will be tested for use as calibration standards for both high pressure gel permeation chromatographic and vapor pressure osmometric procedures. Their responsemore » and retention times will be compared with coal preasphaltenes to determine the suitability of the model compounds as calibration standards.« less" @default.
- W278415083 created "2016-06-24" @default.
- W278415083 creator A5022976585 @default.
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- W278415083 date "1982-03-01" @default.
- W278415083 modified "2023-09-27" @default.
- W278415083 title "Synthesis of oligomeric models of coal derived materials for use with GPC calibration. Quarterly reports, September 1981-February 1982. [Preasphaltenes]" @default.
- W278415083 hasPublicationYear "1982" @default.
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