Journal ArticleDOI
On pressure dependence of the parameters of the dual-mode sorption model
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In this article, the sensitivity of the parameters of the dual-mode sorption model on the pressure range, in which sorption of gases in polymers have been studied, was analyzed.Abstract:
Sensitivity of the parameters of the dual-mode sorption (DMS) model on the pressure range, in which sorption of gases in polymers have been studied, was analyzed. Different “gas-polymer” systems were considered but the most detailed analysis was performed for sorption of argon and nitrogen in poly[5,5-difluoro-6,6-bis(trifluoromethyl)] norbornene and polysulfone. It was shown that the model parameters depend upon the range of gas pressure studied. Expanding of the pressure range (0-pi) results in an increase in the Langmuir adsorption capacity C′H and in reduction of Henry's law solubility coefficient kD and Langmuir affinity parameter b. These behaviors does not depend on a choice of an experimental apparatus or software and procedure of nonlinear least squares treatment of the data. As statistical analysis indicated, a systematic error of the measurement cannot call forth the observed dependencies of the model parameters. Different physical reasons of these behaviors were considered, among them: the pressure dependence of the affinity parameter, and the dilation of a polymer. The results obtained showed that although the DMS model, as a rule, gives an excellent fit of the experimental curves, and, hence, can be used as a form of compact storage of information on gas sorption in polymers, one should be careful in using it outside the pressure range in which its parameters have been determined. © 1996 John Wiley & Sons, Inc.read more
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Book ChapterDOI
Transport of Gases and Vapors in Glassy and Rubbery Polymers
TL;DR: In this paper, it was shown that the process of gas dissolution and diffusion in non-porous polymeric membranes is based on the so-called "solution-diffusion" concept, formulated in the 19th century.
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Gas permeation parameters of mixed matrix membranes based on the polymer of intrinsic microporosity PIM-1 and the zeolitic imidazolate framework ZIF-8
Alexandra F. Bushell,Martin P. Attfield,Christopher R. Mason,Peter M. Budd,Yuri Yampolskii,Ludmila Starannikova,A. I. Rebrov,Fabio Bazzarelli,Paola Bernardo,Johannes C. Jansen,Marek Lanč,Karel Friess,Victor P. Shantarovich,V. W. Gustov,Vera Isaeva +14 more
TL;DR: In this paper, mixed matrix membranes (MMMs) based on the polymer of intrinsic microporosity PIM-1 and the zeolitic imidazolate framework ZIF-8 were prepared and their permeation and sorption properties investigated.
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Analysis of dual-mode model parameters for gas sorption in glassy polymers
Shinji Kanehashi,Kazukiyo Nagai +1 more
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Gas sorption and permeation of glassy polymers with microvoids
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Journal ArticleDOI
Predictions of the solubility of gases in glassy polymers based on the NELF model
TL;DR: In this paper, a reliable, predictive model for the solubility of gases and vapours in glassy polymers has been presented: it is based on the free energy expression for the polymer penetrant mixture as obtained from the lattice fluid theory and on the idea that the partial polymer density is an internal state variable for the system.
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