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Stress Whitening in Polyester Melamine Coatings
Johnson Matthey Technology Review, Volume: 62, Issue: 3, Pages: 341 - 349
Swansea University Author:
David Gethin
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DOI (Published version): 10.1595/205651318X15232702178344
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...
Published in: | Johnson Matthey Technology Review |
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ISSN: | 2056-5135 |
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2018
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URI: | https://cronfa.swan.ac.uk/Record/cronfa45895 |
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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 ACEM 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 Aerospace, Civil, Electrical, and Mechanical Engineering COLLEGE CODE ACEM Swansea University 2019-01-14T11:42:21.7739917 2018-11-12T12:24:51.9143191 Faculty of Science and Engineering School of Aerospace, Civil, Electrical, General and Mechanical Engineering - Mechanical 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 |
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David Gethin |
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Emily Radley Chris Lowe David Gethin |
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Johnson Matthey Technology Review |
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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 |
2018-07-01T07:42:36Z |
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11.051066 |