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Type: Artigo de periódico
Title: Effect of conducting carbon black on the photostabilization of injection molded poly(propylene-co-ethylene) containing TiO2
Author: Maia, DRJ
Balbinot, L
Poppi, RJ
De Paoli, MA
Abstract: The photoelectrochemical process initiating degradation during outdoor exposure of polymers containing TiO2 has previously been assigned to the reaction of an excited electron in the conductive band of TiO2 with atmospheric O-2. This reaction generates the superoxide radical O-2(-), which promotes polymer oxidation. Conducting carbon black (CCB) was used in substitution of the non conducting grade (CB) to minimize the photodegradation of injection molded parts made of TiO2 containing poly(propylene-co-ethylene), such as car bumpers. Analysis by light reflectance and specular reflectance in the mid-infrared region using a self-organizing map (SOM) revealed that the formulation with CCB presented less photodegradation. Visual observation and comparative optical micrography showed that samples with CCB exhibited lower surface whitening than samples with CB. Addition of CCB to samples without TiO2 does not contribute to polymer stabilization. We propose that the stabilization effect associated with CCB is a consequence of the deactivation of the TiO2 photoexcited electron by CCB. (C) 2003 Elsevier Ltd. All rights reserved.
Subject: car bumpers
conducting carbon black
self-organizing map
Country: Inglaterra
Editor: Elsevier Sci Ltd
Citation: Polymer Degradation And Stability. Elsevier Sci Ltd, v. 82, n. 1, n. 89, n. 98, 2003.
Rights: fechado
Identifier DOI: 10.1016/S0141-3910(03)00168-X
Date Issue: 2003
Appears in Collections:Unicamp - Artigos e Outros Documentos

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