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Prolonged Thermal Relaxation of the Thermosetting Polymers
The rigidity of structures made of polymer composite materials, operated at elevated temperatures, is mainly determined by the residual rigidity of the polymer binder (which is very sensitive to elevated temperatures); therefore, the study of ways to increase the rigidity of polymer materials under...
Autores principales: | , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2021
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8659472/ https://www.ncbi.nlm.nih.gov/pubmed/34883609 http://dx.doi.org/10.3390/polym13234104 |
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author | Korolev, Alexander Mishnev, Maxim Vatin, Nikolai Ivanovich Ignatova, Anastasia |
author_facet | Korolev, Alexander Mishnev, Maxim Vatin, Nikolai Ivanovich Ignatova, Anastasia |
author_sort | Korolev, Alexander |
collection | PubMed |
description | The rigidity of structures made of polymer composite materials, operated at elevated temperatures, is mainly determined by the residual rigidity of the polymer binder (which is very sensitive to elevated temperatures); therefore, the study of ways to increase the rigidity of polymer materials under heating (including prolonged heating) is relevant. In the previous research, cured thermosetting polymer structure’s non-stability, especially under heating, is determined by its supra-molecular structure domain’s conglomerate character and the high entropy of such structures. The polymer elasticity modeling proved the significance of the entropy factor and layer (EPL) model application. The prolonged heating makes it possible to release adsorptive inter-layer bonds and volatile groups. As a result, the polymer structure is changing, and inner stress relaxation occurs due to this thermo-process, called thermo-relaxation. The present study suggests researching thermo-relaxation’s influence on polymers’ deformability under load and heating. The research results prove the significant polymer structure modification due to thermo-relaxation, with the polymer entropy parameter decreasing, the glassing onset temperature point (Tg) increasing by 1.3–1.7 times, and the modulus of elasticity under heating increasing by 1.5–2 times. |
format | Online Article Text |
id | pubmed-8659472 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2021 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-86594722021-12-10 Prolonged Thermal Relaxation of the Thermosetting Polymers Korolev, Alexander Mishnev, Maxim Vatin, Nikolai Ivanovich Ignatova, Anastasia Polymers (Basel) Article The rigidity of structures made of polymer composite materials, operated at elevated temperatures, is mainly determined by the residual rigidity of the polymer binder (which is very sensitive to elevated temperatures); therefore, the study of ways to increase the rigidity of polymer materials under heating (including prolonged heating) is relevant. In the previous research, cured thermosetting polymer structure’s non-stability, especially under heating, is determined by its supra-molecular structure domain’s conglomerate character and the high entropy of such structures. The polymer elasticity modeling proved the significance of the entropy factor and layer (EPL) model application. The prolonged heating makes it possible to release adsorptive inter-layer bonds and volatile groups. As a result, the polymer structure is changing, and inner stress relaxation occurs due to this thermo-process, called thermo-relaxation. The present study suggests researching thermo-relaxation’s influence on polymers’ deformability under load and heating. The research results prove the significant polymer structure modification due to thermo-relaxation, with the polymer entropy parameter decreasing, the glassing onset temperature point (Tg) increasing by 1.3–1.7 times, and the modulus of elasticity under heating increasing by 1.5–2 times. MDPI 2021-11-25 /pmc/articles/PMC8659472/ /pubmed/34883609 http://dx.doi.org/10.3390/polym13234104 Text en © 2021 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Article Korolev, Alexander Mishnev, Maxim Vatin, Nikolai Ivanovich Ignatova, Anastasia Prolonged Thermal Relaxation of the Thermosetting Polymers |
title | Prolonged Thermal Relaxation of the Thermosetting Polymers |
title_full | Prolonged Thermal Relaxation of the Thermosetting Polymers |
title_fullStr | Prolonged Thermal Relaxation of the Thermosetting Polymers |
title_full_unstemmed | Prolonged Thermal Relaxation of the Thermosetting Polymers |
title_short | Prolonged Thermal Relaxation of the Thermosetting Polymers |
title_sort | prolonged thermal relaxation of the thermosetting polymers |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8659472/ https://www.ncbi.nlm.nih.gov/pubmed/34883609 http://dx.doi.org/10.3390/polym13234104 |
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