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A New Look at the Structure and Thermal Behavior of Polyvinylidene Fluoride–Camphor Mixtures
An experimental quasi-equilibrium phase diagram of the polyvinylidene fluoride (PVDF)–camphor mixture is constructed using an original optical method. For the first time, it contains a boundary curve that describes the dependence of camphor solubility in the amorphous regions of PVDF on temperature....
Autores principales: | , , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2022
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9735715/ https://www.ncbi.nlm.nih.gov/pubmed/36501608 http://dx.doi.org/10.3390/polym14235214 |
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author | Pochivalov, Konstantin V. Basko, Andrey V. Lebedeva, Tatyana N. Ilyasova, Anna N. Shandryuk, Georgiy A. Snegirev, Vyacheslav V. Artemov, Vladimir V. Ezhov, Alexander A. Kudryavtsev, Yaroslav V. |
author_facet | Pochivalov, Konstantin V. Basko, Andrey V. Lebedeva, Tatyana N. Ilyasova, Anna N. Shandryuk, Georgiy A. Snegirev, Vyacheslav V. Artemov, Vladimir V. Ezhov, Alexander A. Kudryavtsev, Yaroslav V. |
author_sort | Pochivalov, Konstantin V. |
collection | PubMed |
description | An experimental quasi-equilibrium phase diagram of the polyvinylidene fluoride (PVDF)–camphor mixture is constructed using an original optical method. For the first time, it contains a boundary curve that describes the dependence of camphor solubility in the amorphous regions of PVDF on temperature. It is argued that this diagram cannot be considered a full analogue of the eutectic phase diagrams of two low-molar-mass crystalline substances. The phase diagram is used to interpret the polarized light hot-stage microscopy data on cooling the above mixtures from a homogeneous state to room temperature and scanning electron microscopy data on the morphology of capillary-porous bodies formed upon camphor removal. Based on our calorimetry and X-ray studies, we put in doubt the possibility of incongruent crystalline complex formation between PVDF and camphor previously suggested by Dasgupta et al. (Macromolecules 2005, 38, 5602–5608). We also describe and discuss the high-temperature crystalline structure of racemic camphor, which is not available in the modern literature. |
format | Online Article Text |
id | pubmed-9735715 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2022 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-97357152022-12-11 A New Look at the Structure and Thermal Behavior of Polyvinylidene Fluoride–Camphor Mixtures Pochivalov, Konstantin V. Basko, Andrey V. Lebedeva, Tatyana N. Ilyasova, Anna N. Shandryuk, Georgiy A. Snegirev, Vyacheslav V. Artemov, Vladimir V. Ezhov, Alexander A. Kudryavtsev, Yaroslav V. Polymers (Basel) Article An experimental quasi-equilibrium phase diagram of the polyvinylidene fluoride (PVDF)–camphor mixture is constructed using an original optical method. For the first time, it contains a boundary curve that describes the dependence of camphor solubility in the amorphous regions of PVDF on temperature. It is argued that this diagram cannot be considered a full analogue of the eutectic phase diagrams of two low-molar-mass crystalline substances. The phase diagram is used to interpret the polarized light hot-stage microscopy data on cooling the above mixtures from a homogeneous state to room temperature and scanning electron microscopy data on the morphology of capillary-porous bodies formed upon camphor removal. Based on our calorimetry and X-ray studies, we put in doubt the possibility of incongruent crystalline complex formation between PVDF and camphor previously suggested by Dasgupta et al. (Macromolecules 2005, 38, 5602–5608). We also describe and discuss the high-temperature crystalline structure of racemic camphor, which is not available in the modern literature. MDPI 2022-11-30 /pmc/articles/PMC9735715/ /pubmed/36501608 http://dx.doi.org/10.3390/polym14235214 Text en © 2022 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 Pochivalov, Konstantin V. Basko, Andrey V. Lebedeva, Tatyana N. Ilyasova, Anna N. Shandryuk, Georgiy A. Snegirev, Vyacheslav V. Artemov, Vladimir V. Ezhov, Alexander A. Kudryavtsev, Yaroslav V. A New Look at the Structure and Thermal Behavior of Polyvinylidene Fluoride–Camphor Mixtures |
title | A New Look at the Structure and Thermal Behavior of Polyvinylidene Fluoride–Camphor Mixtures |
title_full | A New Look at the Structure and Thermal Behavior of Polyvinylidene Fluoride–Camphor Mixtures |
title_fullStr | A New Look at the Structure and Thermal Behavior of Polyvinylidene Fluoride–Camphor Mixtures |
title_full_unstemmed | A New Look at the Structure and Thermal Behavior of Polyvinylidene Fluoride–Camphor Mixtures |
title_short | A New Look at the Structure and Thermal Behavior of Polyvinylidene Fluoride–Camphor Mixtures |
title_sort | new look at the structure and thermal behavior of polyvinylidene fluoride–camphor mixtures |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9735715/ https://www.ncbi.nlm.nih.gov/pubmed/36501608 http://dx.doi.org/10.3390/polym14235214 |
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