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A source‐sink model for water diffusion in an activated carbon fiber/phenolic composite

Sue Alston Orcid Logo, Cris Arnold Orcid Logo, Martin Swan, Corinne Stone

Polymer Composites, Volume: 42, Issue: 7, Pages: 3550 - 3561

Swansea University Authors: Sue Alston Orcid Logo, Cris Arnold Orcid Logo

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DOI (Published version): 10.1002/pc.26078

Abstract

The moisture absorption behavior of a composite comprising phenolic resin and activated carbon fibers was characterized. The resin starts with a water content from curing and the active fibers both adsorb water on their surface and absorb water in sub-surface pores, acting as a sink or source of wat...

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Published in: Polymer Composites
ISSN: 0272-8397 1548-0569
Published: Wiley 2021
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URI: https://cronfa.swan.ac.uk/Record/cronfa56994
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spelling 2021-09-07T15:04:57.4959737 v2 56994 2021-06-01 A source‐sink model for water diffusion in an activated carbon fiber/phenolic composite 031a3fc4df0b3c95331bd0fcef5cf708 0000-0003-0496-3296 Sue Alston Sue Alston true false 9f36b5062fc7093b5cbfc547cf452709 0000-0002-8937-1355 Cris Arnold Cris Arnold true false 2021-06-01 EEN The moisture absorption behavior of a composite comprising phenolic resin and activated carbon fibers was characterized. The resin starts with a water content from curing and the active fibers both adsorb water on their surface and absorb water in sub-surface pores, acting as a sink or source of water. Measured data showed that the dependence of this water uptake on the surrounding relative humidity was highly nonlinear, and that the effective diffusion rate through the composite was very dependent on the starting and end conditions. A physically based model has been successfully developed to simulate this behavior. Diffusion was assumed to be Fickian and entirely through the resin, with a linear dependence of resin water content on external humidity. Water movement between resin and fibers was determined so as to maintain equilibrium, based on measured steady-state water uptake curves across a range of relative humidities. This meant that in mid-range humidities, most water movement was between fibers and resin rather than through the resin, giving low effective diffusion rates. This model and a simple Arrhenius expression for the diffusion coefficient through the resin enabled measured composite diffusion behavior to be accurately predicted over a range of temperatures and humidity changes. Journal Article Polymer Composites 42 7 3550 3561 Wiley 0272-8397 1548-0569 adsorption; composites; computer modeling; diffusion 1 7 2021 2021-07-01 10.1002/pc.26078 http://dx.doi.org/10.1002/pc.26078 COLLEGE NANME Engineering COLLEGE CODE EEN Swansea University This work was supported by the Defence Science and Technology Laboratory, UK. 2021-09-07T15:04:57.4959737 2021-06-01T09:42:30.4222139 College of Engineering Engineering Sue Alston 0000-0003-0496-3296 1 Cris Arnold 0000-0002-8937-1355 2 Martin Swan 3 Corinne Stone 4 56994__20239__21b731ec3a344881aa9ba46d93925854.pdf 56994.pdf 2021-06-24T10:35:51.8565118 Output 2894624 application/pdf Version of Record true © 2021 The Authors. This is an open access article under the terms of the Creative Commons Attribution License true eng http://creativecommons.org/licenses/by/4.0/
title A source‐sink model for water diffusion in an activated carbon fiber/phenolic composite
spellingShingle A source‐sink model for water diffusion in an activated carbon fiber/phenolic composite
Sue, Alston
Cris, Arnold
title_short A source‐sink model for water diffusion in an activated carbon fiber/phenolic composite
title_full A source‐sink model for water diffusion in an activated carbon fiber/phenolic composite
title_fullStr A source‐sink model for water diffusion in an activated carbon fiber/phenolic composite
title_full_unstemmed A source‐sink model for water diffusion in an activated carbon fiber/phenolic composite
title_sort A source‐sink model for water diffusion in an activated carbon fiber/phenolic composite
author_id_str_mv 031a3fc4df0b3c95331bd0fcef5cf708
9f36b5062fc7093b5cbfc547cf452709
author_id_fullname_str_mv 031a3fc4df0b3c95331bd0fcef5cf708_***_Sue, Alston_***_0000-0003-0496-3296
9f36b5062fc7093b5cbfc547cf452709_***_Cris, Arnold_***_0000-0002-8937-1355
author Sue, Alston
Cris, Arnold
author2 Sue Alston
Cris Arnold
Martin Swan
Corinne Stone
format Journal article
container_title Polymer Composites
container_volume 42
container_issue 7
container_start_page 3550
publishDate 2021
institution Swansea University
issn 0272-8397
1548-0569
doi_str_mv 10.1002/pc.26078
publisher Wiley
college_str College of Engineering
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hierarchy_top_id collegeofengineering
hierarchy_top_title College of Engineering
hierarchy_parent_id collegeofengineering
hierarchy_parent_title College of Engineering
department_str Engineering{{{_:::_}}}College of Engineering{{{_:::_}}}Engineering
url http://dx.doi.org/10.1002/pc.26078
document_store_str 1
active_str 0
description The moisture absorption behavior of a composite comprising phenolic resin and activated carbon fibers was characterized. The resin starts with a water content from curing and the active fibers both adsorb water on their surface and absorb water in sub-surface pores, acting as a sink or source of water. Measured data showed that the dependence of this water uptake on the surrounding relative humidity was highly nonlinear, and that the effective diffusion rate through the composite was very dependent on the starting and end conditions. A physically based model has been successfully developed to simulate this behavior. Diffusion was assumed to be Fickian and entirely through the resin, with a linear dependence of resin water content on external humidity. Water movement between resin and fibers was determined so as to maintain equilibrium, based on measured steady-state water uptake curves across a range of relative humidities. This meant that in mid-range humidities, most water movement was between fibers and resin rather than through the resin, giving low effective diffusion rates. This model and a simple Arrhenius expression for the diffusion coefficient through the resin enabled measured composite diffusion behavior to be accurately predicted over a range of temperatures and humidity changes.
published_date 2021-07-01T04:53:37Z
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