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Article
Copolyaramide As a Barrier Material
The films of heterocyclic copolyaramide used at NPO OOO “LIRSOT” for the production of high-strength polyaramide threads are obtained, their gas transport characteristics for helium, oxygen, and carbon dioxide...
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Article
Supercritical CO2 Treatment of Mixed Matrix Membranes Based on Polyimides for Improvement of Their Gas Transport Properties
In this work, mixed matrix membranes (MMMs) were obtained based on polyimides synthesized from a mixture of diethyltoluene diamine (DETDA) isomers and BPDA and 6FDA dianhydrides by introducing metal-organic fr...
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Article
Synthesis and Gas Transport Properties of Polynaphthoylenebenzimidazoles with Keto- and Sulfonic Bridging Groups
Polynaphthoylenebenzimidazoles (PNBI) with keto (PNBI-СО) and sulfonic (PNBI-SO2) bridging groups are prepared by the solid-phase polycyclization of films of corresponding polyaminoimides (PANI) synthesized by th...
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Article
Gas Transport Properties of Vinylidene Fluoride-Tetrafluoroethylene Copolymers
Effect of the content of tetrafluoroethylene groups on the gas transport properties of vinylidene fluoride-tetrafluoroethylene copolymers has been studied. The experimental values of permeability coefficients P a...
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Article
A Method of Liquid-Phase Fluorination of Polymers to Increase the Selectivity of O2/N2 Separation
One-sided modification of homogeneous polymer films of poly(vinyltrimethylsilane) (PVTMS), poly(2,6-dimethyl-1,4-phenylene oxide) (PPO), and polybenzodioxane (PIM-1) by liquid-phase fluorination with a fluorin...
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Article
Open AccessErratum to: Sorption and Gas Transport Characteristics of Polyimides Based on a Mixture of Diethyl Toluene Diamine Isomers
An Erratum to this paper has been published: https://doi.org/10.1134/S2517751622090013
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Article
Open AccessSorption and Gas Transport Characteristics of Polyimides Based on a Mixture of Diethyl Toluene Diamine Isomers
The transport of oxygen, nitrogen, and hydrocarbons C1–C4 in polyimides based on 4,4'-(hexafluoroisopropylidene)diphthalic anhydride (6FDA) and biphenyl-3,3',4,4'-tetracarboxylic acid dianhydride (BPDA) and dieth...
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Article
Synthesis and Gas Separation Properties of Metathesis Poly(5-perfluorobutyl-2-norbornene)
Metathesis poly(5-perfluorobutyl-2-norbornene) has been synthesized for the first time with a high yield of 85–98% and a variable cis/trans ratio of double bonds over first- and third-generation Grubbs’ Ru cataly...
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Article
Effect of Supercritical CO2 Treatment on Mechanical and Gas Transport Characteristics of Polyimides Based on Diethyl Toluene Diamine Isomers
It has been shown that supercritical CO2 (sc-CO2) treatment leads to a significant increase in free volume and gas permeability and a certain decrease in selectivity for films of amorphous polyimides based on a m...
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Article
Effect of Uniform Deformation on the Mechanical and Gas Transport Characteristics of Polyimides Based on Diethyltoluylenediamine
It has been shown that uniform biaxial deformation leads to an increase in the elastic modulus and a simultaneous increase in gas permeability coefficients of films of amorphous polyimides (PIs) based on a mix...
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Article
Poly(2,6-Dimethyl-1,4-Phenylene Oxide) as a Polymer-Polymer Nanocomposite: Mechanical and Gas Transport Characteristics
This work analyses mechanical and gas transport characteristics of films prepared from two samples of poly(2,6-dimethyl-1,4-phenylene oxide) with molecular masses of 355 (PPO-1) and 610 (PPO-2) kDa. It has bee...
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Article
Gas Transport and Separation Properties of Polynorbornene Treated with Elemental Fluorine in a Perfluorodecalin Liquid
Surface modification of metathesis-based polynorbornenes (PNB) has been performed by means of direct fluorination. The treatment has been conducted in a flow type reactor in perfluorodecalin medium by fluorina...
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Article
Synthesis and Gas Transport Properties of Copolymers of Polybenzodioxane PIM-1 and Tetrahydroxyanthracene
New film-forming copolymers PIM-1 with 2,3,6,7-tetrahydroxy-9,10-(p-fluorophenyl)anthracene units in the main chain have been synthesized and investigated. The investigated gas separation characteristics of these...
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Article
Gas Permeability of Cellulose Acetate Films Treated with Fluorine in Perfluorodecalin
The surface of cellulose acetate (CA) films has been modified by gas–liquid fluorination. The treatment has been carried out with a fluorinating mixture (10 vol % F2 + N2) in a perfluorodecalin medium in a flow r...
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Article
5-(Methoxymethyl)norbornene-Based Addition Polymer: Synthesis and Gas-Transport Properties
5-(Methoxymethyl)norbornene is synthesized from the commercial 5-norbornene-2-methanol via the Williamson reaction. Its addition polymerization is studied, and conditions for formation of a high molecular weig...
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Article
Synthesis and Gas Transport Parameters of a Carbosilane Dendrimer
A seventh-generation dendrimer G7 (OTMS) has been obtained by the hydrosilylation reaction of a sixth-generation carbosilane dendrimer with a surface layer. The structure of the resulting compound was confirme...
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Article
The Evaluation of the Hemocompatibility of Polymer Membrane Materials for Blood Oxygenation
A comprehensive interdisciplinary study is performed for 12 polymers promising for the fabrication of membranes for extracorporeal membrane oxygenation based on them by methods of gas permeability, wetting, pi...
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Article
The Synthesis and Gas Transport Properties of PIM-1 Polybenzodioxane Modified with Benzanilide
A chemical modification of PIM-1 polybenzodioxane (a polymer with intrinsic microporosity) is performed by reactions with the involvement of the nitrile group and using a selective quinazoline synthesis reacti...
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Article
Separation of C1–C4 Hydrocarbon Mixtures Using Fe-Containing Siloxane Composition
Polymer composition has been prepared on the basis of commercial siloxane rubber SKTN-D and tris-(methyldiethoxysiloxy)iron with the reagent ratio 60 : 40 wt %, respectively. Transport parameters of individual hy...
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Article
Polyimides Based on the Diethyltoluenediamine Isomer Mixture: Synthesis and Gas Transport Properties
Novel polyimides (PIs) based on the isomeric mixture of diethyltoluenediamine and 6FDA, BPDA, BTDA, ODPA, and BPADA dianhydrides are synthesized using a one-stage technique. The synthesized polymers possess hi...
