Influence of the Chemical Structure of Spacings in Macromolecules on the Fluorocopolymer Nano-Organization

IF 0.6 4区 材料科学 Q4 CRYSTALLOGRAPHY
L. V. Sokolova, D. S. Pronin, E. D. Politova
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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.

Abstract Image

Abstract Image

大分子间距的化学结构对含氟聚合物纳米组织的影响
摘要在三元共聚物--氟共聚物氟橡胶 GFLT 600S 和氟橡胶 GFLT 200S 中发现的尺寸为 3-80 nm 的纳米结构类型的数量(根据大角度 X 射线衍射数据)超过了在双元共聚物--SKF-26 和 SKF-32 中发现的纳米结构类型的数量(根据大角度 X 射线衍射数据)。这一过程受大分子间距化学结构的影响比分子量的影响更大。氟聚合物的动态粘度随温度升高而发生的复杂而不同的变化是由多种相变引起的。研究表明,氟弹性体 SKF-32 与三种含氟聚合物不同,由于分子间存在尺寸为 5 纳米的纳米结构,其强度远高于含氟聚合物中 (3-4) 纳米结构的强度,因此在温度达到 ~190°С 时不会进入粘性流动状态。研究发现,TEMPO 自由基的旋转流动性在更大程度上取决于将有序结构连接成统一体系的通道链的柔韧性,而不是共聚物无序部分的分子间距离。
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来源期刊
Crystallography Reports
Crystallography Reports 化学-晶体学
CiteScore
1.10
自引率
28.60%
发文量
96
审稿时长
4-8 weeks
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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