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Activation volume in superpressed glass-formers
In pressurized glass-forming systems, the apparent (changeable) activation volume V(a)(P) is the key property governing the previtreous behavior of the structural relaxation time (τ) or viscosity (η), following the Super-Barus behavior: [Formula: see text] , T = const. It is usually assumed that V(a...
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Formato: | Online Artículo Texto |
Lenguaje: | English |
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Nature Publishing Group UK
2019
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6760521/ https://www.ncbi.nlm.nih.gov/pubmed/31551437 http://dx.doi.org/10.1038/s41598-019-49848-w |
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author | Drozd-Rzoska, Aleksandra |
author_facet | Drozd-Rzoska, Aleksandra |
author_sort | Drozd-Rzoska, Aleksandra |
collection | PubMed |
description | In pressurized glass-forming systems, the apparent (changeable) activation volume V(a)(P) is the key property governing the previtreous behavior of the structural relaxation time (τ) or viscosity (η), following the Super-Barus behavior: [Formula: see text] , T = const. It is usually assumed that V(a)(P) = V(#)(P), where [Formula: see text] or [Formula: see text] . This report shows that V(a)(P) ≪ V(#)(P) for P → P(g), where P(g) denotes the glass pressure, and the magnitude V(#)(P) is coupled to the pressure steepness index (the apparent fragility). V(#)(P) and V(a)(P) coincides only for the basic Barus dynamics, where V(a)(P) = V(a) = const in the given pressure domain, or for P → 0. The simple and non-biased way of determining V(a)(P) and the relation for its parameterization are proposed. The derived relation resembles Murnaghan - O’Connel equation, applied in deep Earth studies. It also offers a possibility of estimating the pressure and volume at the absolute stability limit. The application of the methodology is shown for diisobutyl phthalate (DIIP, low-molecular-weight liquid), isooctyloxycyanobiphenyl (8*OCB, liquid crystal) and bisphenol A/epichlorohydrin (EPON 828, epoxy resin), respectively. |
format | Online Article Text |
id | pubmed-6760521 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2019 |
publisher | Nature Publishing Group UK |
record_format | MEDLINE/PubMed |
spelling | pubmed-67605212019-11-12 Activation volume in superpressed glass-formers Drozd-Rzoska, Aleksandra Sci Rep Article In pressurized glass-forming systems, the apparent (changeable) activation volume V(a)(P) is the key property governing the previtreous behavior of the structural relaxation time (τ) or viscosity (η), following the Super-Barus behavior: [Formula: see text] , T = const. It is usually assumed that V(a)(P) = V(#)(P), where [Formula: see text] or [Formula: see text] . This report shows that V(a)(P) ≪ V(#)(P) for P → P(g), where P(g) denotes the glass pressure, and the magnitude V(#)(P) is coupled to the pressure steepness index (the apparent fragility). V(#)(P) and V(a)(P) coincides only for the basic Barus dynamics, where V(a)(P) = V(a) = const in the given pressure domain, or for P → 0. The simple and non-biased way of determining V(a)(P) and the relation for its parameterization are proposed. The derived relation resembles Murnaghan - O’Connel equation, applied in deep Earth studies. It also offers a possibility of estimating the pressure and volume at the absolute stability limit. The application of the methodology is shown for diisobutyl phthalate (DIIP, low-molecular-weight liquid), isooctyloxycyanobiphenyl (8*OCB, liquid crystal) and bisphenol A/epichlorohydrin (EPON 828, epoxy resin), respectively. Nature Publishing Group UK 2019-09-24 /pmc/articles/PMC6760521/ /pubmed/31551437 http://dx.doi.org/10.1038/s41598-019-49848-w Text en © The Author(s) 2019 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/. |
spellingShingle | Article Drozd-Rzoska, Aleksandra Activation volume in superpressed glass-formers |
title | Activation volume in superpressed glass-formers |
title_full | Activation volume in superpressed glass-formers |
title_fullStr | Activation volume in superpressed glass-formers |
title_full_unstemmed | Activation volume in superpressed glass-formers |
title_short | Activation volume in superpressed glass-formers |
title_sort | activation volume in superpressed glass-formers |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6760521/ https://www.ncbi.nlm.nih.gov/pubmed/31551437 http://dx.doi.org/10.1038/s41598-019-49848-w |
work_keys_str_mv | AT drozdrzoskaaleksandra activationvolumeinsuperpressedglassformers |