{"title":"Influence of the Chemical Structure of Spacings in Macromolecules on the Fluorocopolymer Nano-Organization","authors":"L. V. Sokolova, D. S. Pronin, E. D. Politova","doi":"10.1134/s1063774524600406","DOIUrl":null,"url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The number of types of nanostructures 3–80 nm in size, found in ternary copolymers—fluorocopolymers Viton GFLT 600S and Viton GFLT 200S with a change in the their history, exceeds (according to the large-angle X-ray diffraction data) that found in double copolymers—SKF-26 and SKF-32. This process is affected more strongly by the chemical structure of spacings in macromolecules rather than the molecular weight. The complex and different character of change in the dynamic viscosity of fluorocopolymers with increasing temperature is caused by multiple phase transitions. It is shown that the fluoroelastomer SKF-32, in contrast to the three fluorocopolymers, does not pass to the viscous flow state up to ~190°С due to the presence of nanostructures of intermolecular type, 5 nm in size, whose strength is much higher than that of (3–4) nm nanostructures in the fluorocopolymers. It is found that the rotational mobility of the TEMPO radical is determined to a greater extent by the flexibility of passage chains, connecting ordered formations into a unified system, rather than the intermolecular distances in the disordered part of copolymers.</p>","PeriodicalId":527,"journal":{"name":"Crystallography Reports","volume":null,"pages":null},"PeriodicalIF":0.6000,"publicationDate":"2024-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Crystallography Reports","FirstCategoryId":"88","ListUrlMain":"https://doi.org/10.1134/s1063774524600406","RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"CRYSTALLOGRAPHY","Score":null,"Total":0}
引用次数: 0
Abstract
The number of types of nanostructures 3–80 nm in size, found in ternary copolymers—fluorocopolymers Viton GFLT 600S and Viton GFLT 200S with a change in the their history, exceeds (according to the large-angle X-ray diffraction data) that found in double copolymers—SKF-26 and SKF-32. This process is affected more strongly by the chemical structure of spacings in macromolecules rather than the molecular weight. The complex and different character of change in the dynamic viscosity of fluorocopolymers with increasing temperature is caused by multiple phase transitions. It is shown that the fluoroelastomer SKF-32, in contrast to the three fluorocopolymers, does not pass to the viscous flow state up to ~190°С due to the presence of nanostructures of intermolecular type, 5 nm in size, whose strength is much higher than that of (3–4) nm nanostructures in the fluorocopolymers. It is found that the rotational mobility of the TEMPO radical is determined to a greater extent by the flexibility of passage chains, connecting ordered formations into a unified system, rather than the intermolecular distances in the disordered part of copolymers.
期刊介绍：
Crystallography Reports is a journal that publishes original articles short communications, and reviews on various aspects of crystallography: diffraction and scattering of X-rays, electrons, and neutrons, determination of crystal structure of inorganic and organic substances, including proteins and other biological substances; UV-VIS and IR spectroscopy; growth, imperfect structure and physical properties of crystals; thin films, liquid crystals, nanomaterials, partially disordered systems, and the methods of studies.
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