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Type: Artigo de periódico
Title: TiO2 distribution in aged and injected isotactic polypropylene parts by synchrotron radiation X-ray microfluorescence
Author: Maia, DRJ
Perez, CA
De Paoli, MA
Abstract: We studied the TiO2 pigment distribution along cross sections of injected isotactic polypropylene samples after they were aged by light exposure for 515 and 3000 h in accelerated test equipment. The TiO2 pigment distribution was studied so that we could understand the whitening process occurring in this type of plastic. For these studies, we used a 20-mum X-ray microbeam. from a synchrotron light source. We observed that the aged and nonaged samples had almost homogeneous distributions of Ti in the cross sections; therefore, pigment migration could not have been responsible for the surface whitening process. There were maxima of Ti intensities that were not in the same region for all samples. This behavior could be explained by the heterogeneity of the extrusion and injection-molding processes. (C) 2002 Wiley Periodicals, Inc.
Subject: whitening
titanium dioxide
X-ray microfluorescence analysis
synchrotron radiation
Country: EUA
Editor: John Wiley & Sons Inc
Citation: Journal Of Polymer Science Part B-polymer Physics. John Wiley & Sons Inc, v. 40, n. 7, n. 657, n. 662, 2002.
Rights: fechado
Identifier DOI: 10.1002/polb.10127
Date Issue: 2002
Appears in Collections:Unicamp - Artigos e Outros Documentos

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