Abstract
In this study, the lattice fluid (LF) and Vrentas’s self-diffusion (VSD) model were employed to predict the gas sorption, diffusion, and permeability through various rubbery polymeric membranes, like PDMS, PB, PE, and PIP as homopolymers and SBR (36 wt.%) and EVAc (54 wt.%) as copolymers. The LF model with use of variable characteristic parameters that were based on the temperature and pressure range of interest, enabled to predict convex behavior of pressure-induced sorption of PDMS and PB with an AARD < 3%. The Dullien method was also used to calculate the self-diffusion coefficient of pure components in the selected polymers. Extending VSD model led to reliable gas diffusion predictions with AARD < 10% for all systems. Furthermore, using concept of bulk modulus in combination with Tait equation, pressure functionality of diffusion factor was successfully corrected. The pressure and temperature dependency of the gas permeability through the selected homopolymers and copolymers were also investigated by the proposed model, and it was observed that the predicted permeability values were consistent with the experimental data.
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Abbreviations
- P i :
-
Permeability of component i (barrer)
- L :
-
Membrane thickness (μm)
- ∆p :
-
Pressure difference of up and downstream of membrane (bar)
- x :
-
Axis of x-direction (-)
- D i :
-
Self-diffusion coefficient of component i
- R :
-
Universal gas constant (j.mol−1.K−1)
- T :
-
Absolute temperature (K)
- N p :
-
Number of penetrants (-)
- w i :
-
Mass fraction of component i
- r i :
-
Molecular length of component i
- \(\widetilde{p}\) :
-
Reduced pressure of mixture (-)
- \(\widetilde{T}\) :
-
Reduced temperature of mixture (-)
- T * i :
-
Characteristic temperature of component i (K)
- p * i :
-
Characteristic pressure of component i (MPa)
- ∆p * ij :
-
Interaction parameter of LF model with respect to i and j component (MPa)
- r :
-
Molecular length of mixture (-)
- M i :
-
Molecular mass of component i (g.mol−1)
- x i :
-
Mole fraction of component i
- k :
-
Slope of bulk modulus function versus pressure in the rubbery state (-)
- K * :
-
Bulk modulus of polymer in the rubbery state at reference temperature (bar)
- k c :
-
Slope of bulk modulus function versus pressure in the glassy state (-)
- K * c :
-
Bulk modulus of polymer in the glassy state at reference temperature (bar)
- \({\widehat{V}}_{FH.i}\) :
-
Hole free-volume of component i (cm3.g−1)
- \({\widehat{V}}_{iJ}\) :
-
Volume of molecular jumping unit of component i (cm3.g−1)
- D oi :
-
Pre-exponential factor of VSD model (cm2.s−1)
- E :
-
Activation energy of VSD model (j.mol−1)
- K I,i :
-
Slope of hole free-volume relation versus temperature (cm3.mol−1.K−1)
- K II,i :
-
Second parameter of hole free-volume relation (K)
- T g,i :
-
Glass transition temperature of component i (K)
- \(\widehat{A}/\widehat{B}\) :
-
Aspect ratio of gaseous penetrants (-)
- a, b, a ’ and b ’ :
-
Parameters of Hariharan relation for each characteristic parameter
- X * :
-
Represents for each characteristic parameter in the Boudouris relation
- N i :
-
Number of first order parameters of i-th group in the repeating unit
- C i :
-
First order parameters of i-th group in the repeating unit
- M j :
-
Number of second order parameters of i-th group in the repeating unit
- D j :
-
Second order parameters of i-th group in the repeating unit
- V c,i :
-
Critical volume of component i (cm3.mol.−1)
- V i :
-
Molar volume of component i (cm3.mol.−1)
- E (w i \(\to\) 1) :
-
Activation energy in the limit of zero mass fraction of polymer
- AARD % :
-
Absolute average relative deviation (%)
- φ i :
-
Volume fraction of component i
- φ i Eq . :
-
Volume fraction of component i at equilibrium state
- ρ i :
-
Density of pure component i (g.cm−3)
- μ i :
-
Chemical potential of component i (j.mol−1)
- \(\widetilde{\rho }\) :
-
Reduced density of mixture (-)
- ρ * i :
-
Characteristic density of component i (g.cm−3)
- υ * i :
-
Characteristic volume of component i (cm3.mol−1)
- υ * :
-
Characteristic volume of mixture (cm3.mol−1)
- δ ij :
-
Interaction parameter of LF model (-)
- α :
-
Thermal expansion of polymer in the rubbery state (K−1)
- κ :
-
Compressibility factor of polymer in the rubbery state (bar−1)
- γ :
-
Gas induced plasticization factor of polymer in the rubbery state (-)
- γ i :
-
Overlap factor of component i (-)
- θ i :
-
Pressure correction of free volume relation (-)
- ξ ij :
-
Interaction parameter of VSD model (-)
- i :
-
Pure gas component i
- j :
-
Pure gas component j
- p :
-
Pure polymer component p
- \(\sum\) :
-
All components except the n-th one
- c :
-
Summation of occupied and interstitial volume
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Mohammad Sajad Sepehri Sadeghian: Conceptualization, Methodology, Data collection, Writing—original draft preparation. Ahmadreza Raisi: Supervision, Study design, Data analysis and interpretation, Writing—review and editing.
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Sepehri Sadeghian, M.S., Raisi, A. A predictive procedure to model gas transport and intrinsic properties of rubbery polymeric membranes using equilibrium thermodynamics and free volume theory. J Polym Res 30, 98 (2023). https://doi.org/10.1007/s10965-023-03482-3
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DOI: https://doi.org/10.1007/s10965-023-03482-3