| Effects of solar UV and climate change on materials. | |
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MedLine Citation:
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PMID: 21253664 Owner: NLM Status: In-Data-Review |
Abstract/OtherAbstract:
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Increased solar ultraviolet radiation (UV) reaches the surface of the Earth as a consequence of a depleted stratospheric ozone layer and changes in factors such as cloud cover, land-use patterns and aerosols. Climate change is expected to result in a 1.1-6.4 °C increase in average temperature by the end of this century, depending on location. Increased levels of UV radiation, especially at high ambient temperatures, are well-known to accelerate the degradation of plastics, rubber and wood materials, thereby reducing their useful lifetimes in outdoor applications. Plastics used routinely outdoors are generally light-stabilized using chemical additives to ensure their useful lifetimes. Wood products are coated for resistance to UV radiation, since photodamage results in enhanced water-susceptibility and their consequent biodegradation under outdoor exposure. The increased damage to materials due to an increased UV-B (280-315 nm) component in solar radiation reaching the Earth likely can be countered using light-stabilization technologies, surface coatings or, in most instances, by substituting the materials in question with greater UV radiation-resistant materials. However, even if these options could be used with all common materials affected, they will invariably result in higher costs. Reliable estimates of the incremental costs involved depend on the anticipated damage and the effectiveness of mitigation strategies employed. We summarize and assess recent findings on light-induced damage to plastic materials, including wood-plastics composites and nanocomposites. The combined effect of increased UV-B radiation and ambient temperature is of special interest, since these two factors represent particularly harsh environmental conditions for most materials. Advances in approaches to light stabilization of materials are also assessed. |
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Authors:
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A L Andrady; H Hamid; A Torikai |
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Publication Detail:
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Type: Journal Article Date: 2011-01-20 |
Journal Detail:
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Title: Photochemical & photobiological sciences : Official journal of the European Photochemistry Association and the European Society for Photobiology Volume: 10 ISSN: 1474-9092 ISO Abbreviation: Photochem. Photobiol. Sci. Publication Date: 2011 Feb |
Date Detail:
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Created Date: 2011-02-02 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 101124451 Medline TA: Photochem Photobiol Sci Country: England |
Other Details:
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Languages: eng Pagination: 292-300 Citation Subset: IM |
Affiliation:
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Department of Chemical and Biomolecular Engineering, North Carolina State University, Raleigh, NC, USA. andrady@andrady.com. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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