期刊
POLYMER TESTING
卷 30, 期 5, 页码 485-492出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.polymertesting.2011.03.009
关键词
Surface temperature; Degradation; Modeling; Weathering; Outdoor
资金
- Finnish Funding Agency for Technology and Innovation (Tekes)
- Oy All-Plast Ab
- Elastopoli Oy
- Exel Composites plc.
- MacGregor (FIN) Oy
- Nokian Tyres plc.
A heat transfer model is constructed to derive the surface temperature of specimens in outdoor weathering. Data on thermal properties of materials and routinely collected weather data are used as inputs for the model. The model is validated against surface temperature data measured on samples of 11 different materials exposed to natural outdoor weathering in Jokioinen, Finland, over a period of 12 months. The agreement between the model and the surface measurements is more than satisfactory with a mean difference less than 0.5 K and a root-mean-square difference ranging from 0.4 to 1.4 K (0.1-0.5%), depending on material. The mean differences between the surface and ambient temperatures range from 0.1 to 1.3 K. Use of ambient temperature instead of sample surface temperature is shown to lead to severe misjudgements in estimations of reaction rates. (C) 2011 Elsevier Ltd. All rights reserved.
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