A Crystal Structure of Ultra-Dispersed Form of Polytetrafluoroethylene Based on X-Ray Powder Diffraction Data Full article
Journal |
Powder Diffraction
ISSN: 0885-7156 , E-ISSN: 1945-7413 |
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Output data | Year: 2004, Volume: 19, Number: 3, Pages: 219-224 Pages count : 6 DOI: 10.1154/1.1707037 | ||||||
Tags | Carrier concentration; Computer simulation; Crystal structure; Crystallography; Diffractometers; Light reflection; Mathematical models; Molecular dynamics; Morphology; Phase transitions; Polymers; Scanning; X ray powder diffraction | ||||||
Authors |
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Affiliations |
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Funding (1)
1 | International Centre for Diffraction Data | 93-10 |
Abstract:
An X-Ray powder diffraction study of ultra-dispersed polytetrafluoroethylene was carried out. As well as a regular polytetrafluoroethylene the ultra-dispersed form contents a high proportion of the crystalline phase. The X-ray diffraction pattern could be described with two-dimensional hexagonal unit cell [a=5.685(1) Å, symmetry group p6mm]. Structural modeling with a continuous electron density approach as well as with a discrete disordered atoms distribution was accomplished. The model was refined using the Rietveld method. The structure is characterized by a spiral arrangement of polymers (CF2-)n along the z-axis with complete mutual disordering by rotational displacement around z, as well as a partial molecular translation along the z-axis. Molecular disordering results in a systematic absence of reflections with 1≠0 and as a sequence in two-dimensional unit cell effect. The presence of complete rotational disordering distinguishes the ultra-dispersed form of polytetrafluoroethylene from the standard one (fluoroplast-4), where only partial disordering is observed.
Cite:
Bouznik V.M.
, Kirik S.D.
, Solovyov L.A.
, Tsvetnikov A.K.
A Crystal Structure of Ultra-Dispersed Form of Polytetrafluoroethylene Based on X-Ray Powder Diffraction Data
Powder Diffraction. 2004. V.19. N3. P.219-224. DOI: 10.1154/1.1707037 WOS Scopus РИНЦ
A Crystal Structure of Ultra-Dispersed Form of Polytetrafluoroethylene Based on X-Ray Powder Diffraction Data
Powder Diffraction. 2004. V.19. N3. P.219-224. DOI: 10.1154/1.1707037 WOS Scopus РИНЦ
Dates:
Submitted: | Aug 11, 2003 |
Accepted: | Feb 25, 2004 |
Published print: | Sep 1, 2004 |
Published online: | Mar 6, 2012 |
Identifiers:
Web of science | WOS:000223780200001 |
Scopus | 2-s2.0-4944244046 |
Elibrary | 13464786 |
Chemical Abstracts | 2004:704918 |
Chemical Abstracts (print) | 142:177385 |
OpenAlex | W2025077702 |