Radiation synthesis of telomers at a constant tetrafluoroethylene concentration in acetone

Bol’shakov, A. I.; Kichigina, G. A.; Kiryukhin, D. P.

doi:10.1134/s0018143909060071

Cited by 20 publications

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“…Radiation-induced telomerization of TFE in solvents leads to the formation of telomers with the common formula R 1 -(TFE) n -R 2 , where n is the chain length, R 1 and R 2 are the end groups representing solvent molecule fragments. When telomers are synthesized in acetone (C 3 H 6 O), the end groups can be H, CH 3 , COCH 3 and CH 2 COCH 3 [38,39], in butyl chloride (CH 3 (CH 2 ) 3 Cl)-H, Cl, and C 4 H 8 Cl [35,40] and in trimethylchlorosilane (C 3 H 9 ClSi)-Cl, -(CH 3 ) 2 ClSi and -(CH 3 ) 3 Si [11,37]. UPTFE FORUM ® does not have such end groups.…”

Section: Introductionmentioning

confidence: 99%

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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Section: Introductionmentioning

confidence: 99%

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

2022

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“…The key factor of the feasibility of this technology is the discovery of the radiation assisted production of low molecular weight polytetrafluoroethylene soluble in organic sol vents. The main results of analyzing this technology and developing the processes for producing the required fractions of tetrafluoroethylene oligomers (telomers) were described in the literature [1][2][3], and the novelty of the technical solution is protected by patents [4,5].…”

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Development of technological foundations of production of glass/polymer composite materials using tetrafluoroethylene oligomers (Telomers) as binders

et al. 2013

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“…Another promising method of making synthetic fabrics waterrepellent is to form a protective coating on their surface by application of tetrafl uoroethylene telomers from solution in acetone [6]. The features of this method and possibility of increasing its effi cacy are examined in the present study.The product based on tetrafl uoroethylene telomers (trade name Cherfl on) was developed and is manufactured at the Institute of Problems in Chemical Physics (IPCP), Russian Academy of Sciences (Chernogolovka) using radiochemical initiation of polymerization of tetrafl uoroethylene monomers ( 60 Co  radiation) [7][8][9]. A mixture of telomers containing more than 90% molecules with an average degree of polymerization of 5-6 and CH 3 -C=O-CH 2 -end groups is formed as a result [7].…”

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confidence: 99%

“…The product based on tetrafl uoroethylene telomers (trade name Cherfl on) was developed and is manufactured at the Institute of Problems in Chemical Physics (IPCP), Russian Academy of Sciences (Chernogolovka) using radiochemical initiation of polymerization of tetrafl uoroethylene monomers ( 60 Co  radiation) [7][8][9]. A mixture of telomers containing more than 90% molecules with an average degree of polymerization of 5-6 and CH 3 -C=O-CH 2 -end groups is formed as a result [7].…”

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confidence: 99%

“…Since the coating formed did not have a continuous but instead an "islet" character with strong overlapping of the regions, it is recommended that the substrate and applied layer be heated to 180-200°C for a certain time [7][8][9]. Loss of end acetone fragments in the telomer macromolecule, softening of the fl uoropolymer, and formation of a protective coating in the form of a continuous fl uoropolymer fi lm take place [10,11].…”

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Giving polyester textile materials high water repellency by treating them with a solution of tetrafluoroethylene telomers

et al. 2010

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It was shown that solutions of tetrafl uoroethylene telomers in acetone form a coating on the surface of fabric which forms a thin fl uoropolymer fi lm after heat treatment and gives polyester fabrics a high level of water repellency. Methods of acting on the fi bre material that allow additionally increasing the degree of water repellency due to regulation of the thickness and ordering of the fi lm and acting on the microrelief of the fabric were revealed. Preliminary chemical activation of the polyester material and an abrasive effect on its water-repellent coating are proposed for this purpose.Giving textile materials water-repellent properties is an important, widely used method of special fi nal fi nishing. Any textile material, even material consisting of water-repellent synthetic fi bres, has relatively high surface energy that ensures the wettability of its surface with water [1]. To prevent wetting, it is necessary to form a new coating with reduced surface energy on the surface of the fi bres. The generally accepted criterion for assessing water repellency is the contact angle of wetting  (the angle between the tangent to the surface of a drop of liquid at the point of contact of three phases -solid, liquid, and gas -and the surface of a solid, measured inside the liquid phase) [2]. For water-repellent surfaces,  is greater than 90°. Textile materials with elevated water-repellent properties which have ultra-( > 120°) and superhydrophobic ( > 150°) properties are of special interest [3].Organofl uorine compounds are the most effective for reducing the surface energy of textile materials and consequently increasing the water and dirt repellency and improving the launderability. Nontraditional methods of making polyester fabrics water repellent by using fl uoropolymers were developed by the "Fluoropolymer Materials and Nanotechnologies" consortium. The method of making polyester fabric water repellent by treating it with a solution of ultradisperse polytetrafl uoroethylene in supercritical carbon dioxide is examined in detail in [4,5]. Another promising method of making synthetic fabrics waterrepellent is to form a protective coating on their surface by application of tetrafl uoroethylene telomers from solution in acetone [6]. The features of this method and possibility of increasing its effi cacy are examined in the present study.The product based on tetrafl uoroethylene telomers (trade name Cherfl on) was developed and is manufactured at the Institute of Problems in Chemical Physics (IPCP), Russian Academy of Sciences (Chernogolovka) using radiochemical initiation of polymerization of tetrafl uoroethylene monomers ( 60 Co  radiation) [7][8][9]. A mixture of telomers containing more than 90% molecules with an average degree of polymerization of 5-6 and CH 3 -C=O-CH 2 -end groups is formed as a result [7]. The solutions of tetrafl uoroethylene telomers in acetone used in the present study were obtained in a reactor that can maintain a constant concentration of monomer during the reaction [8].

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Radiation synthesis of telomers at a constant tetrafluoroethylene concentration in acetone

Cited by 20 publications

References 0 publications

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

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

Development of technological foundations of production of glass/polymer composite materials using tetrafluoroethylene oligomers (Telomers) as binders

Giving polyester textile materials high water repellency by treating them with a solution of tetrafluoroethylene telomers

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