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An investigation of the long-term water uptake behavior and mechanisms of carbon fiber/977-2 epoxy composites

Feras Korkees Orcid Logo, Cris Arnold, Sue Alston

Polymer Engineering & Science, Volume: 58, Issue: 12

Swansea University Author: Feras Korkees Orcid Logo

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DOI (Published version): 10.1002/pen.24830

Abstract

The long‐term water absorption behavior of UD and ±45 carbon fiber/977‐2 epoxy composite and unreinforced 977‐2 epoxy resin has been studied at different environments with various temperatures and relative humidities. Fickian behavior was noticed initially followed by a slight and continuing increas...

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Published in: Polymer Engineering & Science
ISSN: 00323888
Published: POLYMER ENGINEERING AND SCIENCE- Wiley Online Library 2018
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URI: https://cronfa.swan.ac.uk/Record/cronfa40093
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first_indexed 2018-05-10T19:30:50Z
last_indexed 2020-07-10T19:01:45Z
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spelling 2020-07-10T14:26:05.8498561 v2 40093 2018-05-10 An investigation of the long-term water uptake behavior and mechanisms of carbon fiber/977-2 epoxy composites 4d34f40e38537261da3ad49a0dd2be09 0000-0002-5131-6027 Feras Korkees Feras Korkees true false 2018-05-10 MTLS The long‐term water absorption behavior of UD and ±45 carbon fiber/977‐2 epoxy composite and unreinforced 977‐2 epoxy resin has been studied at different environments with various temperatures and relative humidities. Fickian behavior was noticed initially followed by a slight and continuing increase in saturation with time, a behavior that continues for at least 4 years. Fickian saturation and diffusion coefficients of all materials were derived using graphical method. Initial Fickian equilibrium moisture contents were found not to be dependent on temperature but the long‐term increase in solubility increased with temperature. Absorption rates showed strong dependency on temperature and relative humidity. The activation energy values for all materials in the initial stage found to be much higher (40 kJ/mole) than the long‐term stage (10 kJ/mole). Ea values of the neat resin were observed to be slightly lower than the composites. The slow continued weight gain in the long‐term absorption experiments has been seen to be coupled with an incomplete drying and a higher diffusion rate on drying and subsequent re‐conditioning. The possible reasons and mechanisms for the long‐term gradual increase in moisture absorption was further investigated. It was found that molecular relaxation is the most likely dominant mechanism. Journal Article Polymer Engineering & Science 58 12 POLYMER ENGINEERING AND SCIENCE- Wiley Online Library 00323888 31 12 2018 2018-12-31 10.1002/pen.24830 COLLEGE NANME Materials Science and Engineering COLLEGE CODE MTLS Swansea University 2020-07-10T14:26:05.8498561 2018-05-10T17:18:53.1240122 Faculty of Science and Engineering School of Engineering and Applied Sciences - Materials Science and Engineering Feras Korkees 0000-0002-5131-6027 1 Cris Arnold 2 Sue Alston 3 0040093-15052018155014.pdf korkees2018.pdf 2018-05-15T15:50:14.7930000 Output 1000669 application/pdf Accepted Manuscript true 2019-02-20T00:00:00.0000000 true eng
title An investigation of the long-term water uptake behavior and mechanisms of carbon fiber/977-2 epoxy composites
spellingShingle An investigation of the long-term water uptake behavior and mechanisms of carbon fiber/977-2 epoxy composites
Feras Korkees
title_short An investigation of the long-term water uptake behavior and mechanisms of carbon fiber/977-2 epoxy composites
title_full An investigation of the long-term water uptake behavior and mechanisms of carbon fiber/977-2 epoxy composites
title_fullStr An investigation of the long-term water uptake behavior and mechanisms of carbon fiber/977-2 epoxy composites
title_full_unstemmed An investigation of the long-term water uptake behavior and mechanisms of carbon fiber/977-2 epoxy composites
title_sort An investigation of the long-term water uptake behavior and mechanisms of carbon fiber/977-2 epoxy composites
author_id_str_mv 4d34f40e38537261da3ad49a0dd2be09
author_id_fullname_str_mv 4d34f40e38537261da3ad49a0dd2be09_***_Feras Korkees
author Feras Korkees
author2 Feras Korkees
Cris Arnold
Sue Alston
format Journal article
container_title Polymer Engineering & Science
container_volume 58
container_issue 12
publishDate 2018
institution Swansea University
issn 00323888
doi_str_mv 10.1002/pen.24830
publisher POLYMER ENGINEERING AND SCIENCE- Wiley Online Library
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Engineering and Applied Sciences - Materials Science and Engineering{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Engineering and Applied Sciences - Materials Science and Engineering
document_store_str 1
active_str 0
description The long‐term water absorption behavior of UD and ±45 carbon fiber/977‐2 epoxy composite and unreinforced 977‐2 epoxy resin has been studied at different environments with various temperatures and relative humidities. Fickian behavior was noticed initially followed by a slight and continuing increase in saturation with time, a behavior that continues for at least 4 years. Fickian saturation and diffusion coefficients of all materials were derived using graphical method. Initial Fickian equilibrium moisture contents were found not to be dependent on temperature but the long‐term increase in solubility increased with temperature. Absorption rates showed strong dependency on temperature and relative humidity. The activation energy values for all materials in the initial stage found to be much higher (40 kJ/mole) than the long‐term stage (10 kJ/mole). Ea values of the neat resin were observed to be slightly lower than the composites. The slow continued weight gain in the long‐term absorption experiments has been seen to be coupled with an incomplete drying and a higher diffusion rate on drying and subsequent re‐conditioning. The possible reasons and mechanisms for the long‐term gradual increase in moisture absorption was further investigated. It was found that molecular relaxation is the most likely dominant mechanism.
published_date 2018-12-31T03:51:01Z
_version_ 1763752501741355008
score 11.013082

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