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Multicomponent diffusion of hydrogen‐bonding solutes in a polymer
Author(s) -
Elabd Yossef A.,
Barbari Timothy A.
Publication year - 2002
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.690480804
Subject(s) - diffusion , acetonitrile , fourier transform infrared spectroscopy , chemistry , hydrogen bond , infrared spectroscopy , ketone , analytical chemistry (journal) , polymer chemistry , chemical engineering , molecule , thermodynamics , organic chemistry , physics , engineering
The diffusion of methyl ethyl ketone (MEK)/1‐butanol (BOH) mixtures in polyisobutylene (PIB) was studied using time‐resolved FTIR‐ATR spectroscopy at varying mixture compositions. Diffusion coefficients and hydrogen‐bonding interactions were quantitatively measured using this technique. In the MEK/BOH/PIB system, three species were identified from the infrared spectra, free MEK, an MEK‐BOH complex, and a self‐associated BOH cluster. The diffusion coefficient for the MEK‐BOH complex was less than that for free MEK, but larger than the values determined for the BOH cluster. These results were compared to a numerical solution of a multicomponent transport model that explicitly accounts for solute–solute interactions to determine individual diffusion coefficients for all the species identified. In addition, the MEK/BOH/PIB results were compared to those for an MEK/acetonitrile (ACN) mixture, a nonhydrogen‐bonding system, in PIB, to elucidate the differences between interacting and noninteracting systems.