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|Type:||Artigo de periódico|
|Title:||The use of differential photocalorimetry to measure the oxidation induction time of isotatic polypropylene|
|Abstract:||The widespread use of polymeric materials in many applications requires polymers which are weather resistant. The aim of this study is to examine the usefulness of oxidation induction time (OIT) measurements by differential photocalorimetry (DPC) as a tool for evaluating the ultraviolet (UV) stability of isotatic polypropylene (PPi). DPC was used to measure OIT in PPi formulations containing different concentrations of light and thermal stabilizers. The OIT was measured with and without UV light incidence and the results were compared with the appearance of cracks seen with an optical microscopy, after aging in a Weather-Ometer. The measures of OIT with UV light showed values 25-60% smaller than the values of OIT without light, for different formulations. In this paper, these OIT results will be discussed. (C) 2003 Elsevier Ltd. All rights reserved.|
|Editor:||Elsevier Sci Ltd|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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