Radiation-chemical synthesis of tetrafluoroethylene telomers and their use for preparation of thin protective fluoropolymer coatings

Kiryuhin, D. P.; Kim, I. P.; Бузник, В. М.; Игнатьева, Л. Н.; Kuryavyi, V. G.; Сахаров, С. Г.

doi:10.1134/s1070363209030402

Cited by 12 publications

(5 citation statements)

References 2 publications

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“…The use of substances with a shorter chain length (fluorinated oligomers) as materials for hydrophobic coatings is more technologically advantageous [219]. When applied from solutions, some of these oligomers are capable of forming coatings on the surface of filaments with properties similar to those of polytetrafluoroethylene [220,221]. Fluorinated oligomers, obtained either by thermal degradation of fluoropolymers [207,[222][223][224][225][226][227] or by synthesis from fluoromonomers [3,207,211,221,[228][229][230][231][232], are the basis of such coatings.…”

Section: Hydrophobic Propertiesmentioning

confidence: 99%

Giving Improved and New Properties to Fibrous Materials by Surface Modification

et al. 2023

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This review summarizes the results of research published in recent decades on the main directions in the functionalization of fibrous materials using surface modification. Methods for thepreliminary activation of the surface of fibrous materials are described, allowing increasing the adhesion of modifiers. The features of the formation of functionalizing coatings on fibrous materials in comparison with other substrates are analyzed. Some specific methods for evaluating the effectiveness of the surface modification inherent in fibrous materials are considered. Particular attention is paid to giving fibrous materials antimicrobial properties, photoactivity, the ability to protect against ultraviolet radiation, and hydrophobicity.

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Section: Hydrophobic Propertiesmentioning

confidence: 99%

Giving Improved and New Properties to Fibrous Materials by Surface Modification

et al. 2023

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“…Surface functionalization is the act of modifying the surface of a material by bringing physical, chemical or biological characteristics different from the ones originally found on the surface of a material. A functional surface comprises new and/or modified chemical groups and/or morphological features that determine the interaction with the surrounding environment and subsequently the material properties and behavior [105]- [107].…”

Section: Smart Coatingsmentioning

confidence: 99%

Smart Polymers and Coatings Obtained by Ionizing Radiation: Synthesis and Biomedical Applications

Meléndez‐Ortiz¹,

Varca²,

Lugão³

et al. 2015

OJPChem

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Gamma radiation has been shown particularly useful for the functionalization of surfaces with stimuli-responsive polymers. This method involves the formation of active sites (free radicals) onto the polymeric backbone as a result of the exposition to high-energy radiation, in which a proper microenvironment for the reaction among monomer and/or polymer and the active sites takes place, thus leading to propagation which forms side chain grafts. The modification of polymers using high-energy irradiation may be performed by the following methods: direct or simultaneous, pre-irradiation oxidative and pre-irradiation. The most frequent ones correspond to the pre-irradiation oxidative method and the direct one. Radiation-grafting has many advantages over conventional methods considering that it does not require catalyst nor additives to initiate the reaction, and in general, no changes on the mechanical properties with respect to the pristine polymeric matrix are observed. This chapter focused on the synthesis of smart polymers and coatings obtained by the use of gamma radiation. In addition, diverse applications of these materials in the biomedical field are also reported.

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“…Since high molecular weight polytetrafluoroethylene is insoluble in all solvents, it was suggested to use low molecular weight tetrafluoroethylene as the water-repellent. It represents tetrafluoroethylene oligomers capable of forming coatings on the fiber surface and providing them with properties similar to those of polytetrafluoroethylene [18][19][20].…”

Section: Introductionmentioning

confidence: 99%

“…The use of different telogens in radiation-induced telomerization is known to produce different hydrogen-, oxygen-, chloro-and bromine-containing end groups that largely determine the properties of the obtained telomers (solubility, adhesion, hydrophobicity, abrasion resistance and others). Changing the synthesis parameters (telogen, monomer concentration, and radiation dose) makes it possible to obtain telomers with the chain length from several units to hundreds of units [20,29,30]. Works [11,18,20,[30][31][32][33][34][35][36][37] show that tetrafluoroethylene telomers synthesized and dissolved in acetone, butyl chloride and trimethylchlorosilane with the chain length of 20-30 monomer units possess a combination of film-forming properties, good adhesion and high thermal stability.…”

Section: Introductionmentioning

confidence: 99%

“…Changing the synthesis parameters (telogen, monomer concentration, and radiation dose) makes it possible to obtain telomers with the chain length from several units to hundreds of units [20,29,30]. Works [11,18,20,[30][31][32][33][34][35][36][37] show that tetrafluoroethylene telomers synthesized and dissolved in acetone, butyl chloride and trimethylchlorosilane with the chain length of 20-30 monomer units possess a combination of film-forming properties, good adhesion and high thermal stability. These properties of the telomers make them promising water-repellents for fibrous materials.…”

Section: Introductionmentioning

confidence: 99%

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Wear-Resistant Hydrophobic Coatings from Low Molecular Weight Polytetrafluoroethylene Formed on a Polyester Fabric

2022

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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.

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Radiation-chemical synthesis of tetrafluoroethylene telomers and their use for preparation of thin protective fluoropolymer coatings

Cited by 12 publications

References 2 publications

Giving Improved and New Properties to Fibrous Materials by Surface Modification

Giving Improved and New Properties to Fibrous Materials by Surface Modification

Smart Polymers and Coatings Obtained by Ionizing Radiation: Synthesis and Biomedical Applications

Wear-Resistant Hydrophobic Coatings from Low Molecular Weight Polytetrafluoroethylene Formed on a Polyester Fabric

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