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Effect of high pressure carbon dioxide on the solubility and diffusivity of dichloromethane in polyetherimide
Author(s) -
Law Yuk Yu,
Balashova Ida M.,
Danner Ronald P.
Publication year - 2009
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/app.30766
Subject(s) - polyetherimide , dichloromethane , solubility , thermal diffusivity , solvent , carbon dioxide , polymer , diffusion , materials science , hildebrand solubility parameter , chemical engineering , chemistry , polymer chemistry , chromatography , organic chemistry , thermodynamics , physics , engineering
The high pressure inverse gas chromatography technique was used to study the effect of carbon dioxide on the solubility and diffusivity of dichloromethane in polyetherimide. CO 2 was used as the carrier gas with pressures from 0.7 to 3.5 MPa and temperatures between 100 and 175°C. Similar data were obtained for the dichloromethane‐polyetherimide system using helium as the inert carrier gas. As a result of less favorable thermodynamic interactions between the polymer and solvent, the solubility of the dichloromethane was found to be decreased appreciably in the presence of CO 2 . The increased free volume in the polymer provided by the dissolved CO 2 significantly increased the diffusion coefficient. When the temperature was increased the solubility was decreased while the diffusivity was increased. These behaviors have the potential to considerably improve devolatilization processes. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009