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Type: Artigo de periódico
Title: The use of differential photocalorimetry to measure the oxidation induction time of isotatic polypropylene
Author: Volponi, JE
Mei, LHI
Rosa, DD
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.
Subject: polypropylene
Country: Inglaterra
Editor: Elsevier Sci Ltd
Rights: fechado
Identifier DOI: 10.1016/j.polymertesting.2003.09.004
Date Issue: 2004
Appears in Collections:Unicamp - Artigos e Outros Documentos

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