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A Phenomenological Model for Enthalpy Recovery in Polystyrene Using Dynamic Mechanical Spectra
This paper studies the effects of annealing time on the specific heat enthalpy of polystyrene above the glass transition temperature. We extend the Tool–Narayanaswamy–Moynihan (TNM) model to describe the endothermic overshoot peaks through the dynamic mechanical spectra. In this work, we accept the...
Autores principales: | , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2023
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10490033/ https://www.ncbi.nlm.nih.gov/pubmed/37688216 http://dx.doi.org/10.3390/polym15173590 |
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author | Nitta, Koh-hei Ito, Kota Ito, Asae |
author_facet | Nitta, Koh-hei Ito, Kota Ito, Asae |
author_sort | Nitta, Koh-hei |
collection | PubMed |
description | This paper studies the effects of annealing time on the specific heat enthalpy of polystyrene above the glass transition temperature. We extend the Tool–Narayanaswamy–Moynihan (TNM) model to describe the endothermic overshoot peaks through the dynamic mechanical spectra. In this work, we accept the viewpoint that the enthalpy recovery behavior of glassy polystyrene (PS) has a common structural relaxation mode with linear viscoelastic behavior. As a consequence, the retardation spectrum evaluated from the dynamic mechanical spectra around the primary T(g) peak is used as the recovery function of the endothermic overshoot of specific heat. In addition, the sub-T(g) shoulder peak around the T(g) peak is found to be related to the structural relaxation estimated from light scattering measurements. The enthalpy recovery of annealed PS is quantitatively described using retardation spectra of the primary T(g), as well as the kinetic process of the sub-T(g) relaxation process. |
format | Online Article Text |
id | pubmed-10490033 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2023 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-104900332023-09-09 A Phenomenological Model for Enthalpy Recovery in Polystyrene Using Dynamic Mechanical Spectra Nitta, Koh-hei Ito, Kota Ito, Asae Polymers (Basel) Article This paper studies the effects of annealing time on the specific heat enthalpy of polystyrene above the glass transition temperature. We extend the Tool–Narayanaswamy–Moynihan (TNM) model to describe the endothermic overshoot peaks through the dynamic mechanical spectra. In this work, we accept the viewpoint that the enthalpy recovery behavior of glassy polystyrene (PS) has a common structural relaxation mode with linear viscoelastic behavior. As a consequence, the retardation spectrum evaluated from the dynamic mechanical spectra around the primary T(g) peak is used as the recovery function of the endothermic overshoot of specific heat. In addition, the sub-T(g) shoulder peak around the T(g) peak is found to be related to the structural relaxation estimated from light scattering measurements. The enthalpy recovery of annealed PS is quantitatively described using retardation spectra of the primary T(g), as well as the kinetic process of the sub-T(g) relaxation process. MDPI 2023-08-29 /pmc/articles/PMC10490033/ /pubmed/37688216 http://dx.doi.org/10.3390/polym15173590 Text en © 2023 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 Nitta, Koh-hei Ito, Kota Ito, Asae A Phenomenological Model for Enthalpy Recovery in Polystyrene Using Dynamic Mechanical Spectra |
title | A Phenomenological Model for Enthalpy Recovery in Polystyrene Using Dynamic Mechanical Spectra |
title_full | A Phenomenological Model for Enthalpy Recovery in Polystyrene Using Dynamic Mechanical Spectra |
title_fullStr | A Phenomenological Model for Enthalpy Recovery in Polystyrene Using Dynamic Mechanical Spectra |
title_full_unstemmed | A Phenomenological Model for Enthalpy Recovery in Polystyrene Using Dynamic Mechanical Spectra |
title_short | A Phenomenological Model for Enthalpy Recovery in Polystyrene Using Dynamic Mechanical Spectra |
title_sort | phenomenological model for enthalpy recovery in polystyrene using dynamic mechanical spectra |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10490033/ https://www.ncbi.nlm.nih.gov/pubmed/37688216 http://dx.doi.org/10.3390/polym15173590 |
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