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Stress Whitening in Polyester Melamine Coatings

Emily Radley, Chris Lowe, David Gethin Orcid Logo

Johnson Matthey Technology Review, Volume: 62, Issue: 3, Pages: 341 - 349

Swansea University Author: David Gethin Orcid Logo

Abstract

Stress whitening is a long-standing problem and scientific work has focused on evaluating causes of this in bulk polymer systems. In this paper we focus on this optical defect exhibited by a complex thermosetting polyester melamine coating system used extensively in the pre-coated metal industry. Th...

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Published in: Johnson Matthey Technology Review
ISSN: 2056-5135
Published: 2018
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URI: https://cronfa.swan.ac.uk/Record/cronfa45895
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first_indexed 2018-11-12T14:24:00Z
last_indexed 2019-01-14T14:00:12Z
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spelling 2019-01-14T11:42:21.7739917 v2 45895 2018-11-12 Stress Whitening in Polyester Melamine Coatings 20b93675a5457203ae87ebc32bd6d155 0000-0002-7142-8253 David Gethin David Gethin true false 2018-11-12 MECH Stress whitening is a long-standing problem and scientific work has focused on evaluating causes of this in bulk polymer systems. In this paper we focus on this optical defect exhibited by a complex thermosetting polyester melamine coating system used extensively in the pre-coated metal industry. There are several mechanisms proposed for how stress whitening occurs and hence there is uncertainty over the causes in the systems mentioned. The most likely explanation given to date is that a number of proposed micro-mechanisms exist, which one is occurring is entirely dependent on the system being investigated. The work presented shows that the presence of dissimilar particles is the cause of the stress whitening. The proposed mechanism for whitening and its disappearance in this case is a time and temperature dependent change in density, i.e. cracking or voiding, where the cracks are outside the range that scatters light with an increase in temperature. Journal Article Johnson Matthey Technology Review 62 3 341 349 2056-5135 1 7 2018 2018-07-01 10.1595/205651318X15232702178344 COLLEGE NANME Mechanical Engineering COLLEGE CODE MECH Swansea University 2019-01-14T11:42:21.7739917 2018-11-12T12:24:51.9143191 College of Engineering Engineering Emily Radley 1 Chris Lowe 2 David Gethin 0000-0002-7142-8253 3 0045895-12112018122857.pdf radley2018.pdf 2018-11-12T12:28:57.2600000 Output 1676725 application/pdf Version of Record true 2018-11-12T00:00:00.0000000 true eng
title Stress Whitening in Polyester Melamine Coatings
spellingShingle Stress Whitening in Polyester Melamine Coatings
David Gethin
title_short Stress Whitening in Polyester Melamine Coatings
title_full Stress Whitening in Polyester Melamine Coatings
title_fullStr Stress Whitening in Polyester Melamine Coatings
title_full_unstemmed Stress Whitening in Polyester Melamine Coatings
title_sort Stress Whitening in Polyester Melamine Coatings
author_id_str_mv 20b93675a5457203ae87ebc32bd6d155
author_id_fullname_str_mv 20b93675a5457203ae87ebc32bd6d155_***_David Gethin
author David Gethin
author2 Emily Radley
Chris Lowe
David Gethin
format Journal article
container_title Johnson Matthey Technology Review
container_volume 62
container_issue 3
container_start_page 341
publishDate 2018
institution Swansea University
issn 2056-5135
doi_str_mv 10.1595/205651318X15232702178344
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
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description Stress whitening is a long-standing problem and scientific work has focused on evaluating causes of this in bulk polymer systems. In this paper we focus on this optical defect exhibited by a complex thermosetting polyester melamine coating system used extensively in the pre-coated metal industry. There are several mechanisms proposed for how stress whitening occurs and hence there is uncertainty over the causes in the systems mentioned. The most likely explanation given to date is that a number of proposed micro-mechanisms exist, which one is occurring is entirely dependent on the system being investigated. The work presented shows that the presence of dissimilar particles is the cause of the stress whitening. The proposed mechanism for whitening and its disappearance in this case is a time and temperature dependent change in density, i.e. cracking or voiding, where the cracks are outside the range that scatters light with an increase in temperature.
published_date 2018-07-01T04:00:02Z
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