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Thermodynamic Modeling of Gas Transport in Glassy Polymeric Membranes
- Source :
- Membranes, Membranes, Vol 7, Iss 3, p 46 (2017), Membranes; Volume 7; Issue 3; Pages: 46
- Publication Year :
- 2017
-
Abstract
- Solubility and permeability of gases in glassy polymers have been considered with the aim of illustrating the applicability of thermodynamically-based models for their description and prediction. The solubility isotherms are described by using the nonequilibrium lattice fluid (NELF) (model, already known to be appropriate for nonequilibrium glassy polymers, while the permeability isotherms are described through a general transport model in which diffusivity is the product of a purely kinetic factor, the mobility coefficient, and a thermodynamic factor. The latter is calculated from the NELF model and mobility is considered concentration-dependent through an exponential relationship containing two parameters only. The models are tested explicitly considering solubility and permeability data of various penetrants in three glassy polymers, PSf, PPh and 6FDA-6FpDA, selected as the reference for different behaviors. It is shown that the models are able to calculate the different behaviors observed, and in particular the permeability dependence on upstream pressure, both when it is decreasing as well as when it is increasing, with no need to invoke the onset of additional plasticization phenomena. The correlations found between polymer and penetrant properties with the two parameters of the mobility coefficient also lead to the predictive ability of the transport model.
- Subjects :
- glassy polymers
gas solubility
gas permeability
thermodynamics
NELF model
Non-equilibrium thermodynamics
Thermodynamics
Filtration and Separation
02 engineering and technology
lcsh:Chemical technology
010402 general chemistry
Kinetic energy
Thermal diffusivity
01 natural sciences
Article
Penetrant (mechanical, electrical, or structural)
Thermodynamic
Chemical Engineering (miscellaneous)
lcsh:TP1-1185
lcsh:Chemical engineering
Solubility
chemistry.chemical_classification
Chemistry
Process Chemistry and Technology
Glassy polymer
lcsh:TP155-156
Polymer
021001 nanoscience & nanotechnology
0104 chemical sciences
Exponential function
Permeability (earth sciences)
Materials Science (all)
0210 nano-technology
Subjects
Details
- ISSN :
- 20770375
- Volume :
- 7
- Issue :
- 3
- Database :
- OpenAIRE
- Journal :
- Membranes
- Accession number :
- edsair.doi.dedup.....f235995ccb05b5584230d8ea38c6273d