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Phase transition behavior and deformation mechanism of polytetrafluoroethylene under stretching
The deformation mechanism and phase transition behavior of polytetrafluoroethylene (PTFE) under stretching conditions (25, 50, 100 °C) were investigated by using differential scanning calorimetry (DSC), small angle X-ray scattering (SAXS), and X-ray diffraction (XRD). Compared to the unstretched PTF...
Autores principales: | , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
The Royal Society of Chemistry
2021
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9044566/ https://www.ncbi.nlm.nih.gov/pubmed/35494141 http://dx.doi.org/10.1039/d1ra06333b |
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author | Luo, Cong Pei, Jingke Zhuo, Wenyue Niu, Yanhua Li, Guangxian |
author_facet | Luo, Cong Pei, Jingke Zhuo, Wenyue Niu, Yanhua Li, Guangxian |
author_sort | Luo, Cong |
collection | PubMed |
description | The deformation mechanism and phase transition behavior of polytetrafluoroethylene (PTFE) under stretching conditions (25, 50, 100 °C) were investigated by using differential scanning calorimetry (DSC), small angle X-ray scattering (SAXS), and X-ray diffraction (XRD). Compared to the unstretched PTFE samples, stretching at all temperatures results in a reduced phase transition temperature (IV–I and II–IV). Above a critical strain ε(H,c) (∼0.6), the decrease of phase transition temperature becomes more significant with the increasing strain. At higher stretching temperature, the value of the ε(H,c) becomes smaller. By separating the recoverable (ε(H,r)) and irreversible (ε(H,i)) deformation, a similar ε(H,c) (∼0.6) is found, beyond which the recoverable part remains basically unchanged while the unrecoverable part increases sharply. It is considered that as the strain reaches 0.6, both the untwisting of molecular chain and destroy of the crystal structure could occur, which leads to the increased plastic deformation of the system. Upon the strain is beyond 0.9, the degree of chain untwisting reaches the maximum, and a stable oriented fiber network structure forms, showing the phenomenon of elasticity enhancement. The deformation mechanism of PTFE changes from lamella slip at small strain to stretching induced formation of stable fibrils as evidenced by SEM and SAXS. |
format | Online Article Text |
id | pubmed-9044566 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2021 |
publisher | The Royal Society of Chemistry |
record_format | MEDLINE/PubMed |
spelling | pubmed-90445662022-04-28 Phase transition behavior and deformation mechanism of polytetrafluoroethylene under stretching Luo, Cong Pei, Jingke Zhuo, Wenyue Niu, Yanhua Li, Guangxian RSC Adv Chemistry The deformation mechanism and phase transition behavior of polytetrafluoroethylene (PTFE) under stretching conditions (25, 50, 100 °C) were investigated by using differential scanning calorimetry (DSC), small angle X-ray scattering (SAXS), and X-ray diffraction (XRD). Compared to the unstretched PTFE samples, stretching at all temperatures results in a reduced phase transition temperature (IV–I and II–IV). Above a critical strain ε(H,c) (∼0.6), the decrease of phase transition temperature becomes more significant with the increasing strain. At higher stretching temperature, the value of the ε(H,c) becomes smaller. By separating the recoverable (ε(H,r)) and irreversible (ε(H,i)) deformation, a similar ε(H,c) (∼0.6) is found, beyond which the recoverable part remains basically unchanged while the unrecoverable part increases sharply. It is considered that as the strain reaches 0.6, both the untwisting of molecular chain and destroy of the crystal structure could occur, which leads to the increased plastic deformation of the system. Upon the strain is beyond 0.9, the degree of chain untwisting reaches the maximum, and a stable oriented fiber network structure forms, showing the phenomenon of elasticity enhancement. The deformation mechanism of PTFE changes from lamella slip at small strain to stretching induced formation of stable fibrils as evidenced by SEM and SAXS. The Royal Society of Chemistry 2021-12-14 /pmc/articles/PMC9044566/ /pubmed/35494141 http://dx.doi.org/10.1039/d1ra06333b Text en This journal is © The Royal Society of Chemistry https://creativecommons.org/licenses/by-nc/3.0/ |
spellingShingle | Chemistry Luo, Cong Pei, Jingke Zhuo, Wenyue Niu, Yanhua Li, Guangxian Phase transition behavior and deformation mechanism of polytetrafluoroethylene under stretching |
title | Phase transition behavior and deformation mechanism of polytetrafluoroethylene under stretching |
title_full | Phase transition behavior and deformation mechanism of polytetrafluoroethylene under stretching |
title_fullStr | Phase transition behavior and deformation mechanism of polytetrafluoroethylene under stretching |
title_full_unstemmed | Phase transition behavior and deformation mechanism of polytetrafluoroethylene under stretching |
title_short | Phase transition behavior and deformation mechanism of polytetrafluoroethylene under stretching |
title_sort | phase transition behavior and deformation mechanism of polytetrafluoroethylene under stretching |
topic | Chemistry |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9044566/ https://www.ncbi.nlm.nih.gov/pubmed/35494141 http://dx.doi.org/10.1039/d1ra06333b |
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