Abstract
AbstractSamples of PVC, plasticized with a range of aliphatic and aromatic esters, were naturally weathered by exposure for one year in Arizona. Standard weathering tests involve inclining the plasticized PVC sheets at 45 degrees to the horizontal facing south. In this way, the greatest exposure to sunlight is achieved. In the present study, duplicate samples of the plasticized PVC sheets were placed at 0 degrees (i.e., horizontal). Comparison of the degradation levels of these samples with the equivalent samples stored at 45 degrees shows that samples stored horizontally have much higher levels of degradation. This has been interpreted in terms of degradation being caused mainly by short wavelength ultraviolet radiation, which is strongly scattered and reaches the sample from a vertical direction rather than directly from the sun.
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