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Search Results (3)

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Keywords = tetrafluoroethylene telomers

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16 pages, 8011 KB  
Article
Polymer System Based on Polyethylene Glycol and TFE Telomers for Producing Films with Switchable Wettability
by Evgeniy Belov, Konstantine Nadaraia, Igor Imshinetskiy, Dmitry Mashtalyar, Lidia Ignatieva, Yurii Marchenko, Ivan Osmushko, Maria Gerasimenko, Sergey Sinebruykhov and Sergey Gnedenkov
Int. J. Mol. Sci. 2024, 25(9), 4904; https://doi.org/10.3390/ijms25094904 - 30 Apr 2024
Cited by 1 | Viewed by 1628
Abstract
Today a lot of attention is paid to the formation of thermosensitive systems for biomedical and industrial applications. The development of new methods for synthesis of such systems is a dynamically developing direction in chemistry and materials science. In this regard, this paper [...] Read more.
Today a lot of attention is paid to the formation of thermosensitive systems for biomedical and industrial applications. The development of new methods for synthesis of such systems is a dynamically developing direction in chemistry and materials science. In this regard, this paper presents results of the studies of a new synthesized supramolecular polymer system based on polyethylene glycol and tetrafluoroethylene telomers. The films formed from the polymer substance have the property of switching wettability depending on temperature after heating activation. It has been established that the wettability changes at 60 °C. The contact angle of activated hydrophobic polymer film reaches 143°. Additionally, the system exhibits its properties regardless of the pH of the environment. Based on data obtained by the methods of infrared and x-ray photoelectron spectroscopy, differential thermal analysis and thermal analysis in conjunction with wettability and morphology, a model of the behavior of molecules in a polymer system was built that ensures switching of the hydrophilic/hydrophobic surface state. The resulting polymer system, as well as films based on it, can be used in targeted drug delivery, implantation surgery, as sensors, etc. Full article
(This article belongs to the Special Issue Molecular Insight into Novel Coatings: Design, Synthesis, and Applications)
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14 pages, 2209 KB  
Article
Cellulose from Annual Plants and Its Use for the Production of the Films Hydrophobized with Tetrafluoroethylene Telomers
by Sergey A. Baskakov, Yulia V. Baskakova, Eugene N. Kabachkov, Galina A. Kichigina, Pavel P. Kushch, Dmitriy P. Kiryukhin, Svetlana S. Krasnikova, Elmira R. Badamshina, Sergey G. Vasil’ev, Timofey A. Soldatenkov, Victor N. Vasilets, Filipp O. Milovich, Alexandre Michtchenko, Oksana V. Veselova, Vasiliy A. Yakimov, Svetlana N. Ivanova and Yury M. Shulga
Molecules 2022, 27(18), 6002; https://doi.org/10.3390/molecules27186002 - 15 Sep 2022
Cited by 12 | Viewed by 3631
Abstract
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 [...] Read more.
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 (approximately 70%) and the glass transition temperature (105–108 °C) were determined. It was found that the whiteness characteristic in the case of HogC was 92% and this significate was obtained without a bleaching procedure using chlorine-containing reagents. In this paper, the possibility of hydrophobization of HogC films by treatment with radiation-synthesized telomers of tetrafluoroethylene is shown. It was found that the contact angle of the telomer-treated cellulose film surface depended on the properties of the telomers (the chemical nature of the solvent, and the initial concentration of tetrafluoroethylene) and could reach 140 degrees. Full article
(This article belongs to the Section Materials Chemistry)
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14 pages, 4886 KB  
Article
Wear-Resistant Hydrophobic Coatings from Low Molecular Weight Polytetrafluoroethylene Formed on a Polyester Fabric
by Natalia P. Prorokova, Tatyana Yu. Kumeeva and Igor V. Kholodkov
Coatings 2022, 12(9), 1334; https://doi.org/10.3390/coatings12091334 - 14 Sep 2022
Cited by 5 | Viewed by 2591
Abstract
The paper presents a comparative analysis of the surface structure and morphology of hydrophobic coatings formed on a polyester fabric from various types of low molecular weight tetrafluoroethylenes by a new method. The low molecular weight compounds used include: ultrafine polytetrafluoroethylene of the [...] Read more.
The paper presents a comparative analysis of the surface structure and morphology of hydrophobic coatings formed on a polyester fabric from various types of low molecular weight tetrafluoroethylenes by a new method. The low molecular weight compounds used include: ultrafine polytetrafluoroethylene of the FORUM® trademark prepared through thermo-gas-dynamic decomposition of industrial polytetrafluoroethylene waste, and tetrafluoroethylene telomers, synthesized by radiation-chemical initiation from fluoromonomers in acetone, butyl chloride and trimethylchlorosilane solutions. The formation of coatings consists in deposition of low molecular weight tetrafluoroethylenes from solutions in supercritical carbon dioxide and organic solvents. The contact angle and water absorption of the polyester fabric with coatings containing the specified water-repellents are determined. The resistance of the achieved effect to various types of wear—washing, dry cleaning and abrasionis evaluated. The hydrophobic properties of the fabric are found to be affected by the coating plasticity characterized by the stiffness coefficient. The importance of this indicator to targeted changes in fabric properties is proved. All the considered types of low molecular weight polytetrafluoroethylene (PTFE) are shown to be effective water-repellents for the polyester fabric. Full article
(This article belongs to the Special Issue Efficiency of Coatings Formed in Various Ways)
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