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Gas chromatographic measurements of diffusion coefficients of trace amounts of benzene, toluene, and ethylbenzene in polyisobutylene at elevated temperatures
Author(s) -
Jiang W. H.,
Han R.
Publication year - 2001
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/1097-4628(20010425)80:4<529::aid-app1127>3.0.co;2-9
Subject(s) - ethylbenzene , toluene , benzene , chemistry , thermal diffusivity , diffusion , inverse gas chromatography , volume (thermodynamics) , chromatography , solvent , gas chromatography , analytical chemistry (journal) , partition coefficient , thermodynamics , organic chemistry , physics
The measurements of the diffusion coefficients of trace amounts of three solvents, benzene, toluene, and ethylbenzene, in polyisobutylene (PIB) were performed at elevated temperatures by inverse gas chromatography. A packed chromatographic column was used. The Hadj‐Romdhane‐Danner mathematical model to describe the chromatographic process and the corresponding moment analysis were adopted to determine the diffusion coefficients. The goodness of fit of the experimental diffusion coefficient data to the Vrentas‐Duda free‐volume relationship indicates that the free‐volume theory is a very good description of the relationship of the observed solvent diffusion coefficient with temperature. Furthermore, the solvent diffusivity data were compared, by using the free‐volume theory, with those determined by nuclear magnetic resonance method for the systems of PIB/benzene and PIB/ toluene. The good agreements show that these diffusivity data obtained by inverse gas chromatography measurement are reliable. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 80: 529–538, 2001