Effect of Low-Temperature Plasma on the Structure of Surface Layers and Gas-Separation Properties of Poly(Vinyltrimethylsilane) Membranes

IF 2 Q4 CHEMISTRY, PHYSICAL

Membranes and Membrane Technologies Pub Date : 2023-04-19 DOI:10.1134/S2517751623020063

D. A. Syrtsova, A. V. Zinoviev, M. S. Piskarev, E. A. Skryleva, A. K. Gatin, A. B. Gilman, A. I. Gaidar, A. A. Kuznetsov, V. V. Teplyakov

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Abstract

New results of studying the one-sided surface modification of polymer films and flat-sheet composite membranes based on poly(vinyltrimethylsilane) using low-temperature plasma are presented. Treatment is carried out by direct current discharge at a cathode and anode, air is used as a working medium, the exposure time is from 10 to 60 s, and the working pressure in a chamber is 15–20 Pa. The structure of the surface layers is analyzed by XPS, AFM, and SEM, and the contact properties of the surface are studied. For cathode-treated PVTMS films the effective permeability coefficients for O₂, N₂, СН₄, СО₂, Не, and Н₂, as well as the effective gas diffusion coefficients, are measured experimentally and the effective gas solubility coefficients are calculated. The permeability coefficients of the studied gases for cathode- and anode-modified composite membranes with a selective PVTMS layer are determined. It is shown that the choice of electrode significantly affects not only the chemical structure of surface and near-surface PVTMS layers but also the gas-transport parameters of the modified samples. It is found that, in the case of cathode-modified homogeneous films, the values of permeability, diffusion, and solubility coefficients of gases are higher while the values of selectivity are lower compared with the anode-modified films. At the same time, the treatment of PVTMS films at the cathode for 30 s makes it possible to increase O₂/N₂ selectivity by more than two times relative to the initial values. The results of modification of the composite membranes differ from those attained for the homogeneous films, and, what is more, for the composite membrane treated at the cathode the O₂/N₂ selectivity is higher by a factor of 2.5 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 demonstrated.

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低温等离子体对聚乙烯三甲基硅烷膜表层结构和气体分离性能的影响

介绍了低温等离子体对聚合物薄膜和基于聚乙烯基三甲基硅烷的平板复合膜进行单侧表面改性研究的新成果。处理方式为阴极和阳极直流放电，工作介质为空气，曝光时间为10 ~ 60s，工作压力为15 ~ 20pa。利用XPS、AFM、SEM等分析了表面的结构，并研究了表面的接触性能。对阴极处理后的PVTMS膜进行了O2、N2、СН4、СО2、Не和Н2的有效渗透系数和气体有效扩散系数的实验测量，并计算了有效气体溶解度系数。测定了具有选择性PVTMS层的阴极和阳极改性复合膜的气体渗透性系数。结果表明，电极的选择不仅对表面和近表面PVTMS层的化学结构有显著影响，而且对改性样品的气体输运参数也有显著影响。结果表明，在阴极修饰的均匀膜中，气体的渗透性系数、扩散系数和溶解度系数比阳极修饰的膜高，而选择性系数比阳极修饰的膜低。同时，PVTMS薄膜在阴极处理30 s后，O2/N2选择性比初始值提高了两倍以上。复合膜的改性结果与均匀膜的改性结果不同，而且，在阴极处理的复合膜的O2/N2选择性比初始值高2.5倍。指出了低温等离子体对聚合物膜和膜进行表面改性以改善其气体分离性能的潜力。

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来源期刊

Membranes and Membrane Technologies Multiple-

CiteScore

3.10

自引率

31.20%

发文量

期刊介绍： The journal Membranes and Membrane Technologies publishes original research articles and reviews devoted to scientific research and technological advancements in the field of membranes and membrane technologies, including the following main topics:novel membrane materials and creation of highly efficient polymeric and inorganic membranes;hybrid membranes, nanocomposites, and nanostructured membranes;aqueous and nonaqueous filtration processes (micro-, ultra-, and nanofiltration; reverse osmosis);gas separation;electromembrane processes and fuel cells;membrane pervaporation and membrane distillation;membrane catalysis and membrane reactors;water desalination and wastewater treatment;hybrid membrane processes;membrane sensors;membrane extraction and membrane emulsification;mathematical simulation of porous structures and membrane separation processes;membrane characterization;membrane technologies in industry (energy, mineral extraction, pharmaceutics and medicine, chemistry and petroleum chemistry, food industry, and others);membranes and protection of environment (“green chemistry”).The journal has been published in Russian already for several years, English translations of the content used to be integrated in the journal Petroleum Chemistry. This journal is a split off with additional topics.