Effects of Natural and Artificial Weathering on the Physical Properties of Recycled Poly(ethylene terephthalate)

Original Paper
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Abstract

In accelerated weathering tests, specimens are exposed to higher radiation intensity, temperature and humidity than is likely under natural weathering in order to achieve rapid degradation of the polymer in a convenient short time. In the current work, a correlation between the two environments is attempted so that a prediction of lifetimes in the natural environment can be achieved. During aging, surface flaws are created due to the chain scission process. This is initiated by the absorption of ultra-violet light and directly affects visual appearance and impact strength. After natural weathering, the material shows only plastic deformation in an impact test. However, after artificial weathering to 5000 h of UV exposure, there is a decrease of 85% in impact strength. Colour change occurs at a high rate in the early stages of UV exposure. Beyond 2000 h of exposure, the colour change approaches a steady state and a correlation between the changes under natural and artificial weathering becomes apparent for a potential prediction of lifetimes. From the analysis including the specular component (SCI), taking surface roughening into account, 1 year under natural weathering was found to be equivalent to 25 days under accelerated weathering.

Keywords

UV degradation Poly(ethylene terephthalate) Weathering Recycling 

Notes

Acknowledgements

The authors are grateful to Dr. Padmasari Kankanam Gamage for his technical support within the polymer laboratories at London Metropolitan University.

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Sir John Cass Faculty of Art, Architecture and DesignLondon Metropolitan UniversityLondonUK
  2. 2.BrightonUK

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