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Glass Transition Behavior of Wet Polymers

We have performed a systematical investigation on the glass transition behavior of amorphous polymers with different solvent concentrations. Acrylate-based amorphous polymers are synthesized and treated by isopropyl alcohol to obtain specimens with a homogenous solvent distribution. The small strain...

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Detalles Bibliográficos
Autores principales: Li, Hai, Xiao, Rui
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7915364/
https://www.ncbi.nlm.nih.gov/pubmed/33557319
http://dx.doi.org/10.3390/ma14040730
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author Li, Hai
Xiao, Rui
author_facet Li, Hai
Xiao, Rui
author_sort Li, Hai
collection PubMed
description We have performed a systematical investigation on the glass transition behavior of amorphous polymers with different solvent concentrations. Acrylate-based amorphous polymers are synthesized and treated by isopropyl alcohol to obtain specimens with a homogenous solvent distribution. The small strain dynamic mechanical tests are then performed to obtain the glass transition behaviors. The results show that the wet polymers even with a solvent concentration of more than 60 wt.% still exhibit a glass transition behavior, with the glass transition region shifting to lower temperatures with increasing solvent concentrations. A master curve of modulus as a function of frequency can be constructed for all the polymer–solvent systems via the time–temperature superposition principle. The relaxation time and the breadth of the relaxation spectrum are then obtained through fitting the master curve using a fractional Zener model. The results indicate that the breadth of the relaxation spectrum has been greatly expanded in the presence of solvents, which has been rarely reported in the literature. Thus, this work can potentially advance the fundamental understanding of the effects of solvent on the glass transition behaviors of amorphous polymers.
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spelling pubmed-79153642021-03-01 Glass Transition Behavior of Wet Polymers Li, Hai Xiao, Rui Materials (Basel) Article We have performed a systematical investigation on the glass transition behavior of amorphous polymers with different solvent concentrations. Acrylate-based amorphous polymers are synthesized and treated by isopropyl alcohol to obtain specimens with a homogenous solvent distribution. The small strain dynamic mechanical tests are then performed to obtain the glass transition behaviors. The results show that the wet polymers even with a solvent concentration of more than 60 wt.% still exhibit a glass transition behavior, with the glass transition region shifting to lower temperatures with increasing solvent concentrations. A master curve of modulus as a function of frequency can be constructed for all the polymer–solvent systems via the time–temperature superposition principle. The relaxation time and the breadth of the relaxation spectrum are then obtained through fitting the master curve using a fractional Zener model. The results indicate that the breadth of the relaxation spectrum has been greatly expanded in the presence of solvents, which has been rarely reported in the literature. Thus, this work can potentially advance the fundamental understanding of the effects of solvent on the glass transition behaviors of amorphous polymers. MDPI 2021-02-04 /pmc/articles/PMC7915364/ /pubmed/33557319 http://dx.doi.org/10.3390/ma14040730 Text en © 2021 by the authors. 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 (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Li, Hai
Xiao, Rui
Glass Transition Behavior of Wet Polymers
title Glass Transition Behavior of Wet Polymers
title_full Glass Transition Behavior of Wet Polymers
title_fullStr Glass Transition Behavior of Wet Polymers
title_full_unstemmed Glass Transition Behavior of Wet Polymers
title_short Glass Transition Behavior of Wet Polymers
title_sort glass transition behavior of wet polymers
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7915364/
https://www.ncbi.nlm.nih.gov/pubmed/33557319
http://dx.doi.org/10.3390/ma14040730
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