Characterizing the dielectric properties of carbon fiber at different processing stages

Abstract The polyacrylonitrile (PAN) fibers go through a series of chemical reactions in various processing temperatures/stages and finally turn into the so-called carbon fibers. Oxidization is the first stage, and it takes the largest proportion of the entire processing time for the tremendous chan...

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Autores principales:	Hsien-Wen Chao, Hung-Chun Hsu, Yen-Ren Chen, Tsun-Hsu Chang
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/efb84f64f46d43cca14606cf85df5c9f
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spelling	oai:doaj.org-article:efb84f64f46d43cca14606cf85df5c9f2021-12-02T19:09:20ZCharacterizing the dielectric properties of carbon fiber at different processing stages10.1038/s41598-021-96949-62045-2322https://doaj.org/article/efb84f64f46d43cca14606cf85df5c9f2021-09-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-96949-6https://doaj.org/toc/2045-2322Abstract The polyacrylonitrile (PAN) fibers go through a series of chemical reactions in various processing temperatures/stages and finally turn into the so-called carbon fibers. Oxidization is the first stage, and it takes the largest proportion of the entire processing time for the tremendous change from a chain texture to a ladder texture. The pre-carbonization of carbon fibers is then achieved using a furnace with a higher processing temperature (typically at 700–900 °C). During the reaction processes, the color of the fibers changes from white (PAN) to light black (oxidation), and eventually to black (pre-carbonization). Characterizing the complex permittivity helps us determine the carbonization status of the fibers. This work employed the enhanced-field method (EFM) and the contour mapping method to determine the fibers’ dielectric properties for the first time. Results show that both the real and imaginary parts of permittivity increase as the processing temperature rises. The dielectric constants change from 2.82 (PAN) to 6.50 (pre-carbonization), and the loss tangents increase from 0.007 (lossless) to 0.089 (lossy). This study provides a simple and effective method for characterizing carbon fibers’ processing status and can be applied to the measurement of other fibrous materials.Hsien-Wen ChaoHung-Chun HsuYen-Ren ChenTsun-Hsu ChangNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-7 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Hsien-Wen Chao Hung-Chun Hsu Yen-Ren Chen Tsun-Hsu Chang Characterizing the dielectric properties of carbon fiber at different processing stages
description	Abstract The polyacrylonitrile (PAN) fibers go through a series of chemical reactions in various processing temperatures/stages and finally turn into the so-called carbon fibers. Oxidization is the first stage, and it takes the largest proportion of the entire processing time for the tremendous change from a chain texture to a ladder texture. The pre-carbonization of carbon fibers is then achieved using a furnace with a higher processing temperature (typically at 700–900 °C). During the reaction processes, the color of the fibers changes from white (PAN) to light black (oxidation), and eventually to black (pre-carbonization). Characterizing the complex permittivity helps us determine the carbonization status of the fibers. This work employed the enhanced-field method (EFM) and the contour mapping method to determine the fibers’ dielectric properties for the first time. Results show that both the real and imaginary parts of permittivity increase as the processing temperature rises. The dielectric constants change from 2.82 (PAN) to 6.50 (pre-carbonization), and the loss tangents increase from 0.007 (lossless) to 0.089 (lossy). This study provides a simple and effective method for characterizing carbon fibers’ processing status and can be applied to the measurement of other fibrous materials.
format	article
author	Hsien-Wen Chao Hung-Chun Hsu Yen-Ren Chen Tsun-Hsu Chang
author_facet	Hsien-Wen Chao Hung-Chun Hsu Yen-Ren Chen Tsun-Hsu Chang
author_sort	Hsien-Wen Chao
title	Characterizing the dielectric properties of carbon fiber at different processing stages
title_short	Characterizing the dielectric properties of carbon fiber at different processing stages
title_full	Characterizing the dielectric properties of carbon fiber at different processing stages
title_fullStr	Characterizing the dielectric properties of carbon fiber at different processing stages
title_full_unstemmed	Characterizing the dielectric properties of carbon fiber at different processing stages
title_sort	characterizing the dielectric properties of carbon fiber at different processing stages
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/efb84f64f46d43cca14606cf85df5c9f
work_keys_str_mv	AT hsienwenchao characterizingthedielectricpropertiesofcarbonfiberatdifferentprocessingstages AT hungchunhsu characterizingthedielectricpropertiesofcarbonfiberatdifferentprocessingstages AT yenrenchen characterizingthedielectricpropertiesofcarbonfiberatdifferentprocessingstages AT tsunhsuchang characterizingthedielectricpropertiesofcarbonfiberatdifferentprocessingstages
_version_	1718377123501047808

Characterizing the dielectric properties of carbon fiber at different processing stages

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