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  • 1
    ISSN: 0193-7197
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Samples 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.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0193-7197
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Samples of PVC, plasticized with a range of dialkyl phthalates, linear and branched, have been naturally weathered by exposure for one year in Arizona. The results confirm previous findings, that aromatic plasticizers can act to accelerate the photodehydrochlorination of PVC and that the low photostability of phthalates with long, branched side chains results in a greater level of dehydrochlorination than that produced by either linear or branched shorter alkyl chains. For alkyl groups of the same carbon number, the branched chains produce a greater level of dehydrochlorination than the straight chains. Possible explanations for these observations are considered.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    Signatur Availability
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