Dielectric properties of thermosetting material nanocomposites

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dc.contributor.authorDias, Newton Luiz Filho
dc.contributor.authorde Aquino, Hermes Adolfo
dc.contributor.authorPereira, Denise Souza
dc.contributor.authorRosa, Andre H.
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2014-05-20T13:12:09Z
dc.date.available2014-05-20T13:12:09Z
dc.date.issued2007-10-05
dc.description.abstractThe dieletric relaxation properties of thermosetting material nanocomposites based on spherosilicate nanoplatforms were studied from room temperature to 170 degrees C, varying the frequency from 10 to 1000 KHz. Permittivity (epsilon'), dielectric loss (epsilon ''), and activation energy (E-a) were calculated. The results of dielectric relaxation were confirmed by those of the final properties. The dielectric loss amplitude decreases with increasing ODPG content until about 70-73 wt % and slightly increases at higher ODPG content. This means that the increasing of the ODPG content in the composite samples decreases the number of pendants groups and/or increases crosslink densitv, causing decreased motion of organic tethers, and subsequently decreasing of the dipolar mobility. The results of apparent activation energy, fracture toughness and tensile modulus mechanical properties show the same profile with respect to ODPG content, in the sense that they exhibit maxima around 70 wt % ODPG. For the ODPG/MDA composites, this formulation of 70 wt % ODPG containing excess of amine is not composition where the highest crosslinked density is reached. This implies that the best mechanical properties and E-a are provided by some degree of chain flexibility. (c) 2007 Wiley Periodicals, Inc.en
dc.description.affiliationUniv Estadual Paulista, Dept Quim & Fis, BR-15385000 Ilha Solteira, SP, Brazil
dc.description.affiliationUniv Estadual Paulista, Dept Engn Ambiental, CEP, BR-18087180 Sorocaba, SP, Brazil
dc.description.affiliationUnespUniv Estadual Paulista, Dept Quim & Fis, BR-15385000 Ilha Solteira, SP, Brazil
dc.description.affiliationUnespUniv Estadual Paulista, Dept Engn Ambiental, CEP, BR-18087180 Sorocaba, SP, Brazil
dc.format.extent205-213
dc.identifierhttp://dx.doi.org/10.1002/app.26393
dc.identifier.citationJournal of Applied Polymer Science. Hoboken: John Wiley & Sons Inc., v. 106, n. 1, p. 205-213, 2007.
dc.identifier.doi10.1002/app.26393
dc.identifier.issn0021-8995
dc.identifier.lattes2642875331083480
dc.identifier.orcid0000-0002-2042-018X
dc.identifier.urihttp://hdl.handle.net/11449/144
dc.identifier.wosWOS:000248609900027
dc.language.isoeng
dc.publisherWiley-Blackwell
dc.relation.ispartofJournal of Applied Polymer Science
dc.relation.ispartofjcr1.901
dc.relation.ispartofsjr0,543
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.subjectdieletric relaxationpt
dc.subjectthermoset materialpt
dc.subjectnanocompositept
dc.subjectspherosilicatept
dc.titleDielectric properties of thermosetting material nanocompositesen
dc.typeArtigo
dcterms.licensehttp://olabout.wiley.com/WileyCDA/Section/id-406071.html
dcterms.rightsHolderWiley-Blackwell
unesp.author.lattes2642875331083480
unesp.author.lattes5228846314663888[4]
unesp.author.orcid0000-0002-2042-018X[4]
unesp.campusUniversidade Estadual Paulista (Unesp), Instituto de Ciência e Tecnologia, Sorocabapt
unesp.campusUniversidade Estadual Paulista (Unesp), Faculdade de Engenharia, Ilha Solteirapt

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Artigos - Física e Química - FEIS
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