Dielectric properties of thermosetting material nanocomposites

dc.contributorUniversidade Estadual Paulista (UNESP)
dc.creatorDias, Newton Luiz Filho
dc.creatorde Aquino, Hermes Adolfo
dc.creatorPereira, Denise Souza
dc.creatorRosa, Andre H.
dc.date2014-05-20T13:12:09Z
dc.date2016-10-25T16:32:29Z
dc.date2014-05-20T13:12:09Z
dc.date2016-10-25T16:32:29Z
dc.date2007-10-05
dc.date.accessioned2017-04-05T19:15:50Z
dc.date.available2017-04-05T19:15:50Z
dc.identifierJournal of Applied Polymer Science. Hoboken: John Wiley & Sons Inc., v. 106, n. 1, p. 205-213, 2007.
dc.identifier0021-8995
dc.identifierhttp://hdl.handle.net/11449/144
dc.identifierhttp://acervodigital.unesp.br/handle/11449/144
dc.identifier10.1002/app.26393
dc.identifierWOS:000248609900027
dc.identifier0000-0002-2042-018X
dc.identifierhttp://dx.doi.org/10.1002/app.26393
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/850521
dc.descriptionThe 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.
dc.languageeng
dc.publisherWiley-Blackwell
dc.relationJournal of Applied Polymer Science
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.subjectdieletric relaxation
dc.subjectthermoset material
dc.subjectnanocomposite
dc.subjectspherosilicate
dc.titleDielectric properties of thermosetting material nanocomposites
dc.typeOtro


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