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dc.contributor.authorDanielle Galiani, P.-
dc.contributor.authorAntonio Malmonge, J.-
dc.contributor.authorGuenther Soares, B.-
dc.contributor.authorHenrique Capparelli Mattoso, L.-
dc.identifier.citationPlastics, Rubber and Composites, v. 42, n. 8, p. 334-339, 2013.-
dc.description.abstractThermal-oxidative degradation behaviours of raw natural rubber (NR) have been investigated by using thermogravimetry analysis in inert and oxidative atmospheres and the plasticity retention index (PRI). The activation energy E a, was calculated using Horowitz-Metzger and Coats-Redfern methods and compared with PRI. The E a values obtained by each method were in good agreement with each other. The June samples are the least stable rubbers among the studied ones, whereas February samples exhibited the highest values of activation energy, therefore in agreement with the PRI behaviour, which indicates that the thermo-oxidative stability of the June samples are the poorest during the thermo-oxidative degradation reaction. Natural rubber is a product of biological origin, and thus these variations in the values of thermal behaviour and PRI might be related to the genetic differences and alterations of climatic conditions that act directly on the synthesis of non-rubber constituents, which are generally reflected in latex and rubber properties. © 2013 Institute of Materials, Minerals and Mining.en
dc.subjectNatural rubber-
dc.subjectThermogravimetry analysis-
dc.subjectCoats-Redfern method-
dc.subjectOxidative atmosphere-
dc.subjectThermal oxidative degradation-
dc.subjectThermo-oxidative degradation-
dc.subjectThermo-oxidative stability-
dc.subjectActivation energy-
dc.subjectThermogravimetric analysis-
dc.titleStudies on thermal-oxidative degradation behaviours of raw natural rubber: PRI and thermogravimetry analysisen
dc.contributor.institutionUniversidade Federal do Rio de Janeiro (UFRJ)-
dc.contributor.institutionUniversidade Estadual Paulista (UNESP)-
dc.contributor.institutionEmpresa Brasileira de Pesquisa Agropecuária (EMBRAPA)-
dc.description.affiliationInstitute of Macromolecules (IMA) Federal University of Rio de Janeiro (UFRJ), Av. Horácio Macedo, 2 030, Bl. J-21941-598, Rio de Janeiro, RJ State-
dc.description.affiliationDepartment of Physics and Chemistry São Paulo State University (UNESP), Av. Brasil, 56-15385-000, Ilha Solteira, SP State-
dc.description.affiliationEmbrapa Agricultural Instrumentation (CNPDIA), Rua XV de Novembro, 1452-13560-970, São Carlos, SP State-
dc.description.affiliationUnespDepartment of Physics and Chemistry São Paulo State University (UNESP), Av. Brasil, 56-15385-000, Ilha Solteira, SP State-
dc.rights.accessRightsAcesso restrito-
dc.relation.ispartofPlastics, Rubber and Composites-
Appears in Collections:Artigos, TCCs, Teses e Dissertações da Unesp

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