Gas Transport Properties of Vinylidene Fluoride-Tetrafluoroethylene Copolymers

A. Yu. Alentiev; Алентьев А. Ю.; R. Yu. Nikiforov; Никифоров Р. Ю.; I. S. Levin; Левин И. С.; D. A. Tsarev; Царев Д. А.; V. E. Ryzhikh; Рыжих В. Е.; D. A. Syrtsova; Сырцова Д. А.; N. A. Belov; Белов Н. А.

doi:10.31857/S2218117223060020

Gas Transport Properties of Vinylidene Fluoride-Tetrafluoroethylene Copolymers

Authors: Alentiev A.Y.¹, Nikiforov R.Y.¹, Levin I.S.¹, Tsarev D.A.¹, Ryzhikh V.E.¹, Syrtsova D.A.¹, Belov N.A.¹
Affiliations:
1. Topchiev Institute of Petrochemical Synthesis of Russian Academy of Sciences
Issue: Vol 13, No 6 (2023)
Pages: 494-504
Section: Articles
URL: https://journal-vniispk.ru/2218-1172/article/view/231901
DOI: https://doi.org/10.31857/S2218117223060020
EDN: https://elibrary.ru/HXWIQG
ID: 231901

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Abstract

The influence of the content of tetrafluoroethylene (TFE) groups on the gas transport properties of vinylidene fluoride (VDF) and tetrafluoroethylene copolymers has been studied. Experimental values of the permeability coefficients P and diffusion coefficients D for gases H₂, He, N₂, O₂, CO₂, as well as lower hydrocarbons CH₄, C₂H₄ and C₂H₆ were measured and their solubility coefficients S were calculated. The values of the solubility coefficients of CO₂ and C₂H₄ were found to deviate from the linear correlation of lg S on the Lennard-Jones potential. An explanation of this effect was proposed based on facilitated transport models. It was demonstrated that an increase in the content of TFE groups leads to a significant increase in the permeability coefficients of the penetrants studied mainly due to an increase in their diffusion coefficients. So, the permeability coefficient of helium and hydrogen increases approximately in 2.5 times, for carbon dioxide in 3 times, for argon, oxygen, methane and ethylene in 3.5 times, and for nitrogen and ethane in 4.4 times, respectively. These gas separation parameters in combination with good film-forming properties and commercial availability allows us to consider the studied VDF-TFE copolymers as promising materials for the fabrication of composite gas separation membranes.

Keywords

membrane gas separation, polyvinylidene fluoride, permeability, selectivity, diffusion, facilitated transport

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