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Synchrotron and Raman Study of the Rotator Phases and Polymorphism in Tricosane Paraffin
A detailed study of the phase behavior of n-paraffin C(23)H(48) has been performed by means of real-time variable-temperature experiments with synchrotron radiation. Two detectors were employed for simultaneous analysis of the small-angle (SAXS) and wide-angle X-ray-scattering (WAXS) regions. This p...
Autores principales: | , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2020
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7362007/ https://www.ncbi.nlm.nih.gov/pubmed/32545732 http://dx.doi.org/10.3390/polym12061341 |
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author | Blázquez-Blázquez, Enrique Barranco-García, Rosa Cerrada, María L. Martínez, Juan C. Pérez, Ernesto |
author_facet | Blázquez-Blázquez, Enrique Barranco-García, Rosa Cerrada, María L. Martínez, Juan C. Pérez, Ernesto |
author_sort | Blázquez-Blázquez, Enrique |
collection | PubMed |
description | A detailed study of the phase behavior of n-paraffin C(23)H(48) has been performed by means of real-time variable-temperature experiments with synchrotron radiation. Two detectors were employed for simultaneous analysis of the small-angle (SAXS) and wide-angle X-ray-scattering (WAXS) regions. This paraffin presents a very interesting phase behavior, involving two crystal polymorphs, three rotator phases and the liquid state. The Ostwald rule of stages is invoked to find similarities of the rotator phases with the eventual transient mesomorphic structure in the multistage model of polymer crystallization. That study is complemented by variable-temperature Raman experiments covering frequencies down to 150 cm(−1). It was found that the low-frequency region is the most informative regarding the phase transitions, and specifically the intensity of the first overtone. From these analyses, several parameters are evaluated as function of temperature. |
format | Online Article Text |
id | pubmed-7362007 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2020 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-73620072020-07-21 Synchrotron and Raman Study of the Rotator Phases and Polymorphism in Tricosane Paraffin Blázquez-Blázquez, Enrique Barranco-García, Rosa Cerrada, María L. Martínez, Juan C. Pérez, Ernesto Polymers (Basel) Article A detailed study of the phase behavior of n-paraffin C(23)H(48) has been performed by means of real-time variable-temperature experiments with synchrotron radiation. Two detectors were employed for simultaneous analysis of the small-angle (SAXS) and wide-angle X-ray-scattering (WAXS) regions. This paraffin presents a very interesting phase behavior, involving two crystal polymorphs, three rotator phases and the liquid state. The Ostwald rule of stages is invoked to find similarities of the rotator phases with the eventual transient mesomorphic structure in the multistage model of polymer crystallization. That study is complemented by variable-temperature Raman experiments covering frequencies down to 150 cm(−1). It was found that the low-frequency region is the most informative regarding the phase transitions, and specifically the intensity of the first overtone. From these analyses, several parameters are evaluated as function of temperature. MDPI 2020-06-13 /pmc/articles/PMC7362007/ /pubmed/32545732 http://dx.doi.org/10.3390/polym12061341 Text en © 2020 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 Blázquez-Blázquez, Enrique Barranco-García, Rosa Cerrada, María L. Martínez, Juan C. Pérez, Ernesto Synchrotron and Raman Study of the Rotator Phases and Polymorphism in Tricosane Paraffin |
title | Synchrotron and Raman Study of the Rotator Phases and Polymorphism in Tricosane Paraffin |
title_full | Synchrotron and Raman Study of the Rotator Phases and Polymorphism in Tricosane Paraffin |
title_fullStr | Synchrotron and Raman Study of the Rotator Phases and Polymorphism in Tricosane Paraffin |
title_full_unstemmed | Synchrotron and Raman Study of the Rotator Phases and Polymorphism in Tricosane Paraffin |
title_short | Synchrotron and Raman Study of the Rotator Phases and Polymorphism in Tricosane Paraffin |
title_sort | synchrotron and raman study of the rotator phases and polymorphism in tricosane paraffin |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7362007/ https://www.ncbi.nlm.nih.gov/pubmed/32545732 http://dx.doi.org/10.3390/polym12061341 |
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