G. A. Kichigina

• PhD
• Senior Researcher at Russian Academy of Sciences

In this work, monolithic graphene oxide aerogel (GOA) with a volume of about 4 cm³ was obtained. In order to modify its properties, the GOA samples were irradiated with ⁶⁰Co gamma rays with doses from 10 to 220 kGy. By using XPS it was found that the oxygen/carbon ratio in the samples studied decreases as a result of irradiation. A blue shift of th...

A spectral study of radiation-synthesized telomers of tetrafluoroethylene with different end groups has been carried out by Raman spectroscopy for the first time. The effect of gamma radiation on the molecular structure of telomeres and hydrophobic coatings of aluminoborosilicate glass fabric based on them was studied. Changes in the molecular and...

The radiation-induced telomerization of tetrafluoroethylene in pentafluorochlorobenzene, penta-fluorobromobenzene, and hexafluorobenzene has been studied. It has been shown that the process efficiency and the chain length of the resulting telomers depends on the binding energy of the substituent in the fluori-nated benzene rings. An analysis of the...

Coatings of aluminoborosilicate fabric have been obtained by deposition from solutions of radiation-synthesized tetrafluoroethylene telomers. The resulting coatings were characterized by IR spectroscopy. By the sessile drop method, it has been established that the surface of the coatings is hydrophobic with a water contact angle of 140°. The effect...

New perfluorinated telomers have been obtained by radiation-induced telomerization of tetrafluoroethylene in Flutec PP3. The effect of the initial monomer concentration in Flutec PP3 on their properties was studied by IR spectroscopy and differential scanning calorimetry. It was shown that fragments of carbogal molecules are included in the composi...

Polymer Science, Series D, 2023, Vol. 16, No. 1, pp. 168–172. Composites Based on Latexes and Tetrafluoroethyene Telomers for Coatings of Wood Materials G. A. Gorbacheva, A. N. Zarubinaa, D. O. Sashinaa, A. F. Sultanovaa, A. N. Ivankina, N. V. Skuratova, G. A. Kichiginab, P. P. Kutschb, D. P. Kiryukhinb, and V. G. Sanaeva *e-mail: gorbacheva@bmstu...

The process of obtaining cellulose from the Sosnowsky hogweed stem and spathellas from this cellulose is described in detail. The task is relevant from the point of view of the use of this weed. The elemental composition and properties of the obtained cellulose samples were studied by elemental analysis, infrared (IR) spectroscopy, X-ray powder dif...

Herein, we show that thin films of MAPbI3, FAPbI3, (CsMA)PbI3, and (CsMAFA)PbI3, where MA and FA are methylammonium and formamidinium cations, respectively, tolerate ultrahigh doses of γ rays approaching 10 MGy without significant changes in their absorption spectra. However, among the studied materials, FAPbI3 was the only one that did not form me...

Calculations of the technical and economic effect from the use of thermal and electroosmosis-based drying methods in relation to agricultural production have been carried out according to the developed algorithms. For this purpose, the study compares oven drying (OD) (drying box SNOL 3.5´3.5 for EM 0,25-2,2 kW, drying box with heaters 10 kV for EM...

Cellulose HogC was produced by the modified traditional method with 35% yield from the stem of Sosnovsky hogweed and was characterized by elemental analysis, infrared (IR) spectroscopy, powder X-ray diffractometry, differential scanning calorimetry (DSC) and X-ray photoelectron spectroscopy (XPS). For HogC, the degree of crystallinity (approximatel...

Cellulose HogC was produced by an attractive method the dry stem of Sosnovsky hogweed employing successive grinding, acidizing (3% HNO 3 , 24 h, 80-90 o C), alkaline treatment (2% KOH, 2 h, 60-70 o C), bleaching (3% H 2 O 2 + 1% KOH, 20 min, 60-70 o C) and freeze drying. The composition, crystalline structure, vibrational response and thermal stabi...

The influence of monomer concentration on the properties of radiation-synthesized tetrafluoroethylene telomers in perfluoro-1,3-dimethylcyclohexane has been studied by differential scanning calorimetry and IR spectroscopy, and their thermophysical and structural characteristics have been determined. Using perfluorinated telomers synthesized at vari...

The study results of coatings of wood materials produced using tetrafluoroethylene telomeres and synthetic water-based latexes: acrylic, styrene-acrylic and polyurethane are presented. Optimal combinations of deposited layers of polymer coatings have been established, which allow one to obtain the most qualitative surface of finished wood with low...

Melamine-formaldehyde resins are widely used in the production of various technical and household products. By foaming a special resin, it is possible to obtain various foam plastics, including melamine sponges (MS), which, due to their unusual mesh structure and properties, absorb and wash away contamination quite well and have well-pronounced abr...

The process of hydrophobization of melamine sponges has been investigated. Solutions of radiation synthesized tetrafluoroethylene telomers, which had different chain lengths and end groups, in acetone and a Freon 113-ammonia solvent blend were used as water repellents. The composition and structure of hydrophobized melamine sponges were studied by...

Меламиноформальдегидные смолы широко применяются в производстве различных изделий технического и бытового назначения. В результате вспенивания специальной смолы получают различные пенопласты, в том числе меламиновые губки (МГ), которые благодаря необычной сетчатой структуре и свойствам хорошо впитывают и смывают загрязнения и имеют ярко выраженные...

The results of studies on radiation-initiated telomerization of tetrafluoroethylene and on the properties of telomers with reactive terminal hydroxyl, amino, and silane groups are summarized. Prospects for application of the telomers obtained in the design of hydrophobic coatings of glass and polyester fabrics and highly porous ceramic materials ba...

This work presents the results of a study of tetrafluoroethylene telomers obtained in three types of telogens: acetone, methylene chloride, trichlorotrifluoroethane (Freon 113). The main attention was paid to revealing morphology, molecular structure, phase composition, and thermal properties of the obtained materials. It was revealed that the telo...

The process of hydrophobization of aluminoborosilicate glass fabric subjected to chemical activation by acid etching has been studied. The solutions of radiation-synthesized tetrafluoroethylene telomers having different chain lengths and chemically active terminal hydroxyl and amino groups have been used as a hydrophobizing agent. A comparative ana...

The article is devoted to assessing the effectiveness of the hydrophobization effect produced on the polyester fabric by tetrafluoroethylene telomeres obtained by radiation telomerization in trimethylchlorosilane. The indicators of the hydrophobicity of polyester fabrics have been determined and the morphology of the formed coatings has been studie...

The main results of successful 30-year’s working on the Gammatok-100 radiation research facility at the Institute of Problems of Chemical Physics to study various radiation-induced chemical transformations are summarized. The advantages of the unique radiation facility, the design features of which allowed its continuous operation during the entire...

Porous ceramic materials based on oxide fibers, which have lower specific density and thermal conductivity, are able to function at temperatures exceeding 1000°C, including in an oxidizing atmosphere, which allows this class of materials to have a wide range of applications in various industries. The disadvantage of such materials is the hydrophili...

Fluoroplastic varnished cloth is a fiberglass fabric that has been repeatedly impregnated with fluoroplastic suspension (F-4D) and treated thermally; it contains ~60–80% of fluoroplastic. In this work, silica fabric KT-11-13 has been used as the base for the production of varnished cloths with a low content of fluoropolymer, whereas solutions of te...

Radiation-induced telomerization of tetrafluoroethylene in mixtures of trifluoroethanol and Freon 113 with ethanol at room temperature was studied. Tetrafluoroethylene telomers with different mean chain length and terminal hydroxy groups were obtained. The properties of the telomers were studied by thermal gravimetric analysis, elemental analysis,...

A method of the formation of the composite polymer-containing coatings on a MA8 magnesium alloy (Mg-Mn-Ce system) pretreated by the plasma electrolytic oxidation with subsequent application of the organofluorine component such as telomeric tetrafluoroethylene (TFE) solutions in pentafluorochlorobenzene, ethyl acetate and trifluorotrichlorethane (Fr...

The kinetics of radiation telomerization of tetrafluoroethylene in Freon 113 with ethanol and ammonia additives have been studied by kinetic calorimetry. Tetrafluoroethylene telomers with terminal hydroxyl and amino groups have been obtained. The molecular structure, properties, and composition of the telomers have been investigated by IR spectrosc...

With the use of EPR, UV–VIS, and IR spectroscopy, calorimetry, and elemental analysis, it has been found that radicals are spontaneously formed under the action of molecular bromine on the methyl acrylate (MA) monomer at low temperatures; upon heating the system (225 K), these radicals initiate a polymerization reaction. This process is not efficie...

This paper presents the method of fabricate and the results of investigation of electrochemical properties and wettability of the composite coatings obtained on the magnesium alloy by plasma electrolytic oxidation (PEO) and the use of the solution of tetrafluoroethylene (TFE) telomers. The fluoropolymer-containing coatings decrease corrosion curren...

Modification of cellulose-containing materials (wood veneer, paper) with solutions of radiationsynthesized tetrafluoroethylene telomers was studied. Treatment with a solution of tetrafluoroethylene telomers enhances the ultimate strength, chemical resistance, and flame resistance of the materials and decreases the yield of extractable substances in...

The kinetics of radiation-initiated telomerization of tetrafluoroethylene in dichlorodimethylsilane and chlorotrimethylsilane have been studied, and the molecular structure and properties of the telomers have been revealed. It has been shown that the introduction of ~3.5 wt % product telomer into aluminoborosilicate glass fabric gives a fluorinated...

The kinetics of radiation telomerization of tetrafluoroethylene (TFE) in trifluoroethanol and hexafluoropropan-2-ol (HFIP) has been investigated by method of kinetic calorimetry. The nature of active centers initiating the process of telomerization of tetrafluoroethylene in hexafluoroisopropanol in the temperature range of 77—300 K was investigated...

In this paper we describe a way to prepare hybrid functional polymer materials (HFPMs) based on epoxy binders that contain functionalized carbon nanotubes and a compatibilizer (Cherflon tetrafluoroethylene telomer). A micropattern has been found to form on the prepreg surface in the lack of external pressure that ensures high-level hydrophobicity (...

It has been shown that the addition of molecular bromine to the monomer acrylamide (AA) results in the spontaneous formation of radicals. During heating the AA + Br2 mixture, the radicals initiate polymerization and bromination reactions. Beginning well below the melting point of bromine, both the reactions proceed at a noticeable rate at its melti...

In this work, we have suggested a new approach to fabricating fluorine-containing glass fibers based on the infiltration of glass-fiber filler by radiation-synthesized telomer solutions of tetrafluoroethylene. The radiation-chemical synthesis of tetrafluoroethylene telomers has been carried out in some solvents, their thermal stability has been stu...

New composites based on activated caramelized aluminoborosilicate glass fabric and radiationsynthesized tetrafluoroethylene telomer solutions were prepared, and their properties were studied. The properties of materials prepared from standard commercial and caramelized glass fabrics were compared.

In this work, modification of coatings based on FP-5182 lacquer that is prepared from the copolymer of trifluorochloroethylene and vinylidenefluoride (F-32L) has been performed in order to improve their hydrophobicity. Several approaches to modification have been suggested, among which is the use of telomeric solutions of tetrafluoroethylene that w...

A calorimetric study of low-temperature radiation telomerization of tetrafluoroethylene in ethanol and trifluoroethanol has been performed. The phase state of reaction mixtures of different compositions in the temperature range of 77-300 K and the process kinetics have been studied depending on the radiation dose and the monomer concentration. The...

Methods for forming protective coatings from tetrafluoroethylene (TFE) telomeric solutions were developed. A complex study of electrochemical, tribological, and hydrophobic properties of composite coatings formed on magnesium alloys by plasma electrolytic oxidation, followed by deposition of a fluororganic material from TFE solutions, was carried o...

Kinetic calorimetry was used to study the kinetics of low-temperature post-radiation telomerization of tetrafluoroethylene in ethanol and hexafluoroisopropanol. The temperature range in which the reaction occurs and its efficiency depend on the phase state of the reaction mixture at low-temperatures and on the chemical nature of the solvent. The na...

This article is devoted to the analysis of the surface properties of polyester textile materials modified with the tetrafluoroethylene telomeres synthesized in acetone and butyl chloride in order to impart high hydrophobicity to the materials. The particularities of the morphology of the formed hydrophobic coatings in the case of the use of various...

Chical reactions initiated by 60Co γ-radiation in the suspensions of single-wall carbon nanotubes (SWCNTs) in the aqueous solutions of a surfactant, cetyltrimethylammonium bromide (CTAB), have been studied. In a pure aqueous solution of CTAB, the radiolysis of water leads to the appearance of OH radicals, which induce the oxidation of CTAB molecule...

Chemical reactions stimulated by γ-radiation in liquid hydrocyanic acid (HCN) in the presence of single-walled edcarbon nanotubes (SWCNTs) have been studied. The polymerization of HCN on the surface of nanotubes occurs several times more rapidly than in pure HCN, and the set of radiolysis products becomes poorer. It is likely that the approach of p...

Abstract—ESR and IR spectroscopy and scanning calorimetry are used to investigate the mechanism of low� temperature radiation telomerization of tetrafluoroethylene (TFE) in hexafluoroisopropanol (HFIP). It is found that the low�temperature telomerization of TFE in HFIP proceeds via an ion–radical mechanism. This process is initiated by the radical...

The kinetics of radiation-initiated telomerization of tetrafluoroethylene in a 1,2-dibromotetrafluoroethane solution at a constant concentration (pressure) of the monomer in the reactor was studied. The properties, molecular structure, and morphology of the telomers were studied by IR spectroscopy, scanning electron microscopy, and elemental and th...

Tetrafluoroethylene (TFE) telomeres were synthesized in a butyl chloride solution using the radi� ation�chemical initiation of the reaction. The surface of a polyester material was modified with TFE telom� eres to impart superhydrophobic properties to the fabric.

Low-temperature postradiation polymerization of tetrafluoroethylene in the presence of carbon material obtained by explosive exfoliation of graphite oxide has been studied by the technique of calorimetry. The process results in tetrafluoroethylene grafting onto modified graphite oxide to form a new composite containing ∼40–65% polytetrafluoroethyle...

Systematic researches results of radiation-chemical synthesis of tetrafluoroethylene telomeres solutions in various solvents are generalized. Research of kinetics and the mechanism of process, structure and properties of the received products is conducted, necessary parameters of produced telomeres with the most optimum properties are determined. P...

Radiation-chemical synthesis of low molecular weight polymer solutions (telomeres) of tetrafluoroethylene (TFE) in ethyl acetate was carried out and the kinetics of the process is studied. Telomer thermostability is defined initial concentration of monomer in the reaction mixture. The practical application of telomere solutions for modification alu...

Systematic studies devoted to the radiation-chemical synthesis of solutions of tetrafluoroethylene telomers in various solvents are summarized. The properties and application prospects of tetrafluoroethylene telomers are considered. Radiation initiation allows new functional products with a broad spectrum of properties to be obtained and new techno...

By solid-state magic angle-spinning nuclear magnetic resonance spectroscopy (NMR), differential scanning calorimetry (DSC), and IR spectroscopy, polytetrafluoroethylene (PTFE) samples obtained by low-temperature (T = −196°C) postradiation polymerization of tetrafluoroethylene (C2F4) and C2F4 mixtures with a 3D graphene material formed by the microw...

Исследована кинетика радиационной теломеризации тетрафторэтилена в 1,2�дибромтетрафторэтане. Показано, что в перфторированном растворителе процесс протекает весьма эффективно, для полного превращения мономера требуются малые дозы γ-облучения (~2 кГр). В результате реакции образуются теломеры, имеющие длину цепи 120–360 тетрафторэтиленовых звеньев и...

The kinetics of radiation telomerization of tetrafluoroethylene in a series of fluorine-containing solvents was studied. A comparative analysis of their reactivity was carried out. The structure and some properties of the telomeres were studied by IR spectroscopy, thermogravimetric and elemental analysis, and electron microscopy.

The kinetics of low-temperature (180–270 K) postradiation telomerization of tetrafluoroethylene in hexafluoroisopropanol has been investigated. The efficiency of the process is determined by the initial concentration of the monomer in the solvent and the dose of preliminary irradiation. It has been shown that the telomerization reaction proceeds vi...

The kinetics of radiation-induced telomerization of tetrafluoroethylene in chloropentafluorobenzene and perfluoroxylene have been studied. Colloidal solutions of thermally stable tetrafluoroethylene telomers with a chain length of 50–160 units have been obtained. A comparative analysis of the reactivity of some monohalogenated benzene derivatives u...

The kinetics of the radiation telomerization of tetrafluoroethylene in 1,2-dibromotetrafluoroethane has been studied. It has been shown that the process occurs very efficiently in the perfluorinated solvent; small doses of γ-radiation (~2 kGy) are required for the complete conversion of the monomer. Telomers with a chain length of 120–360 tetrafluo...

The kinetics of the radiation-initiated telomerization of tetrafluoroethylene (TFE) in the solutions of telogens (butyl chloride, chloroform, methylene chloride, and carbon tetrachloride) at a constant monomer pressure in the reactor was studied. In the course of the Γ-irradiation of the reaction mixture, TFE telomers containing repeatedly soluble...

Radiation telomerization of tetrafluoroethylene in butyl chloride, chloroform, and carbon tetrachloride has been investigated. The chain length of telomers and their solubility and thermal stability depend on the initial monomer concentration and telogen properties. In the case of telomerization in chloroform and carbon tetrachloride, the yield, th...

Theoretical and experimental investigations of the traveling wave mechanisms of fast solid-phase cryochemical reactions carried out over a period of three decades are summarized. Applications of the concepts of “non-Arrhenius combustion” and “gasless detonation” to studies of cosmochemical processes near 0 K, explosive-like decays of metastable pha...

Kinetics of radiation-initiated polymerization of tetrafluoroethylene in acetone was studied at various initial concentrations (pressures) of the monomer in the reactor, which remain constant in the course of synthesis. Concentrated solutions of tetrafluoroethylene telomers were obtained and their properties were examined.

The kinetics of the radiation-initiated polymerization of tetrafluoroethylene (TFE) in butyl chloride has been studied. The rate of the process, the properties and yield of telomers obtained depend on the initial concentration of TFE (2.6–22 wt %) in the solution and the dose of γ-irradiation. The analysis of the measured IR absorption spectra and...

It was shown that solutions of tetrafluoroethylene telomers in acetone form a coating on the surface of fabric which forms a thin fluoropolymer film after heat treatment and gives polyester fabrics a high level of water repellency. Methods of acting on the fibre material that allow additionally increasing the degree of water repellency due to regul...

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.

For a filler-containing monomer, features of solid-phase self-sustained-wave regimes of cryocopolymerization initiated by the brittle failure of preradiolyzed samples are studied. Experiments performed with the model system acetaldehyde-alumina allow the proposal that the procedure can be created for the manufacture of polymer composite materials a...

In the Universe, chemical reactions occur at very low temperature, very close to 0K. According to the standard Arrhenius mechanism, these reactions should occur with vanishingly small efficiency. However, cold planets of the solar system, such as Pluto, are covered by a crust composed of ammonia and methane, produced on earth only at very high temp...

Radiation-initiated polymerization of tetrafluoroethylene (TFE) in acetone has been carried out in a specially designed reactor, which makes it possible to maintain a constant concentration of the monomer in a solution during synthesis. The features of the telomerization process at different initial concentrations (pressures) of TFE have been studi...

Propagation of chemical waves at very low temperatures, observed experimentally [V.V. Barelko et al., Advances in Chem. Phys. 74 (1988), 339-384.] at velocities of order 10 cm/s, is due to a very non- standard physical mechanism. The energy liberated by the chemical reaction induces destruction of the material, thereby facilitating the reaction, a...

The effect of initiation conditions on the self-sustained-wave regime of copolymerization of acetaldehyde with hydrogen cyanide has been studied. The local brittle failure in the bottom of the sample makes it possible to implement the high-velocity (detonation-like) traveling wave regime of copolymerization. The velocity of propagation of the react...

Low-temperature (77–150 K) radiation-induced copolymerization of hydrogen cyanide (HCN) and epichlorohydrin (ECH) has been studied. Copolymers have been obtained in two modes of running the reaction, the thermally activated postpolymerization at slow heating of the preliminarily γ-irradiated system and the traveling wave of copolymerization initiat...

The autowave polymerization of preliminarily radiolyzed glassy epichlorohydrin at 77 K has been performed. The progressing wave of polymerization is initiated through the local brittle fracture of the sample. The velocity of propagation of the reaction wave front achieves 15 mm/s at a preliminary irradiation dose of 680 kGy. The progressing wave of...

The kinetics of low-temperature postradiation copolymerization of N-vinylpyrrolidone (N-VP) with triethylene glycol dimethacrylate (TGM-3) were studied using reactant mixtures with different compositions and different pre-irradiation doses, and the characteristics of the obtained copolymers were determined. The copolymerization process is most effe...

An increase in the radiation yield of paramagnetic centers in H2SO4 + nanotubes (NTs) solutions was evidence of the sensitizing influence of NTs on the low-temperature radiolysis of sulfuric acid, that is, on excitation energy and charge transfer. Under the conditions selected, the influence of NTs extended to distances of 100–300 nm. The presence...

The kinetics of radiation-induced copolymerization of N-vinylpyrrolidone with triethylene glycol dimethacrylate was studied. It was shown that the formation of a water-soluble N-vinylpyrrolidone homopolymer and its subsequent grafting onto the copolymer takes place in the system during the process. Copolymers containing up to 90 mol % N-vinylpyrrol...

Without Abstract

The kinetics of radiation-initiated copolymerization of N-vinylpyrrolidone with triethylene glycol dimethacrylate was studied. The variation of the composition of the 3D cross-linked copolymer and of the amount of N-vinylpyrrolidone homopolymer in the course of the process at various initial monomer ratios was monitored.

The spontaneous and radiation-initiated cryochemical reactions of allene hydrobromination were studied. The spontaneous hydrobromination of allene proceeded in the liquid phase in the temperature range 170–280 K, yielding primarily 2-bromopropene. Postradiation hydrobromination was observed at much lower temperatures (80–120 K) with the formation o...

The low-temperature postradiation polymerization of crystalline ketene in the bulk and in solvents during devitrification of systems was studied. It was shown that cryopolymerization in pure ketene and in the ketene-diethyl ether system basically follows the anionic mechanism with C=O bond opening. The polyketene produced is a colored solid partial...

A comparative study was performed on the radiation postpolymerization of a number of dienes and -olefins with sulfur dioxide occurring both on heating of the samples radiolyzed at 77 K and spontaneously by mutual dissolution. The cryopolymerization of sulfur dioxide with butadiene was studied in most detail. It was found that, unlike the case of th...

The polymerization of epichlorohydrin occurs in the temperature region of glass transition as a result of heating of the samples preirradiated at 77 K. The specific heat of polymerization of epichlorohydrin ?Hwas determined to be 95.4 ± 6.0 kJ/mol. The postirradiation polymerization proceeds through the cationic mechanism. The chain propagation rat...

Mechanism of the postradiation copolymerization of isoprene with sulfur dioxide was studied by thorough calorimetric analysis of the phase state and the copolymerization dynamics in the entire range of monomer concentrations. Cooling of the liquid mixture of monomers to 77 K leads to the formation of a glassy solution. On heating the system after r...

Mechanism of the postradiation polymerization of isoprene with sulfur dioxide was studied by thorough calorimetric analysis of the phase state and the copolymerization dynamics in the entire range of monomer concentrations. Cooling the liquid solution of monomers to 77 K leads to the formation of a glassy solution On heating the system by radiolysi...