The Influence of Low-Temperature Plasma on the Structure of Surface Layers and Gas-Separating Properties of Polyvinyltrimethylsilane Membranes

D. A. Syrtsova; Сырцова Д. А.; A. V. Zinoviev; Зиновьев А. В.; M. S. Piskarev; Пискарев М. С.; E. A. Skryleva; Скрылева Е. А.; A. K. Gatin; Гатин А. К.; A. B. Gilman; Гильман А. Б.; A. I. Gaidar; Гайдар А. И.; A. A. Kuznetsov; Кузнецов А. А.; V. V. Teplyakov; Тепляков В. В.

doi:10.31857/S2218117223020062

The Influence of Low-Temperature Plasma on the Structure of Surface Layers and Gas-Separating Properties of Polyvinyltrimethylsilane Membranes

Authors: Syrtsova D.A.¹^,2, Zinoviev A.V.³, Piskarev M.S.³, Skryleva E.A.⁴, Gatin A.K.⁵, Gilman A.B.³, Gaidar A.I.², Kuznetsov A.A.³, Teplyakov V.V.¹
Affiliations:
1. Topchiev Institute of Petrochemical Synthesis of RAS
2. Research Institute of Advanced Materials and Technologies
3. Enikolopov Institute of Synthetic Polymeric Materials of RAS,
4. National Research Technological University MISiS
5. Semenov Institution of Science Federal Research Center for Chemical Physics of RAS
Issue: Vol 13, No 2 (2023)
Pages: 117-127
Section: Articles
URL: https://journal-vniispk.ru/2218-1172/article/view/137996
DOI: https://doi.org/10.31857/S2218117223020062
EDN: https://elibrary.ru/HZUCKI
ID: 137996

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Abstract

New results of one-sided surface modification of polymeric films and composite membranes of polyvinyltrimethylsilane (PVTMS) using low-temperature plasma are presented. The treatment was carried out by direct current discharge at the cathode and anode, air was used as the working gas, the exposure time was from 10 to 60 s, and the working pressure in the chamber was 15–20 Pa. The structure of the surface layers was analyzed by XPS, AFM and SEM, and the contact properties of the surface were also studied. The effective permeability coefficients for O₂, N₂, CH₄, CO₂, He, and H₂, as well as for gas diffusion, for cathode-treated PVTMS films are experimentally obtained, and the effective gas solubility coefficients are calculated. The permeability coefficients of the studied gases for composite membranes with a selective PVTMS layer modified at the cathode and anode were determined. It has been noted that the choice of electrode significantly affects not only the chemical structure of the surface and near-surface layers of PVTMS, but also the gas transport parameters of the modified samples. At the same time, during the treatment of PVTMS films at the cathode for 30 s, it was possible to achieve an increase in the O₂/N₂ selectivity by more than two times relative to the initial value. It has been established that the results of modification of composite membranes differ from those obtained for homogeneous films and it was possible to achieve O₂/N₂ selectivity in 2.5 times higher than the initial value. The potential of using surface modification of polymer films and membranes by low-temperature plasma to improve their gas separation properties is shown.

Keywords

membrane gas separation, polymeric membranes, low-temperature plasma, surface modification of membranes

References

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