Effect of high pressure carbon dioxide on the solubility and diffusivity of dichloromethane in polyetherimide

Autor:	Ida M. Balashova, Yuk Yu Law, Ronald P. Danner
Rok vydání:	2009
Předmět:	Polymers and Plastics Chemistry Diffusion General Chemistry Thermal diffusivity Polyetherimide Surfaces Coatings and Films Solvent chemistry.chemical_compound Volume (thermodynamics) Chemical engineering Materials Chemistry Inverse gas chromatography Organic chemistry Solubility Dichloromethane
Zdroj:	Journal of Applied Polymer Science. 114:2497-2501
ISSN:	1097-4628 0021-8995
DOI:	10.1002/app.30766
Popis:	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. CO2 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 CO2. The increased free volume in the polymer provided by the dissolved CO2 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
Databáze:	OpenAIRE
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