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Membranes 2017, 7(3), 46; https://doi.org/10.3390/membranes7030046

Thermodynamic Modeling of Gas Transport in Glassy Polymeric Membranes

Department of Civil, Chemical, Environmental and Materials Engineering (DICAM), Alma Mater Studiorum–University of Bologna, Via Terracini, 28-I-40131 Bologna, Italy
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Received: 27 July 2017 / Revised: 10 August 2017 / Accepted: 16 August 2017 / Published: 19 August 2017
(This article belongs to the Special Issue Membrane Transport Modeling)
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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. View Full-Text
Keywords: gas solubility; gas permeability; thermodynamics; glassy polymers; NELF model gas solubility; gas permeability; thermodynamics; glassy polymers; NELF model
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Minelli, M.; Sarti, G.C. Thermodynamic Modeling of Gas Transport in Glassy Polymeric Membranes. Membranes 2017, 7, 46.

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