Publicação:
Electric and magnetic properties of polymer electrolyte/carbon black composites

dc.contributor.authorFranco, R. W A
dc.contributor.authorDonoso, J. P.
dc.contributor.authorMagon, C. J.
dc.contributor.authorRodella, C. B.
dc.contributor.authorFlorentino, A. O.
dc.contributor.authorSaeki, M. J. [UNESP]
dc.contributor.authorPernaut, J. M.
dc.contributor.authorDe Oliveira, A. L.
dc.contributor.institutionUniversidade de São Paulo (USP)
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionUniversidade Federal de Minas Gerais (UFMG)
dc.date.accessioned2014-05-27T11:19:38Z
dc.date.available2014-05-27T11:19:38Z
dc.date.issued1998-12-01
dc.description.abstractMeasurements of 1H Nuclear Magnetic Resonance (NMR) relaxation times, Electron Paramagnetic Resonance (EPR) and AC Impedance Spectroscopy (IS) are reported for composites based on PEO8:LiClO4 and carbon black (CB), prepared by two methods: solvent and fusion processing. Three nuclear relaxation processes were identified for 1H nuclei: (i) belonging to the polymer chains in the amorphous phase, loosely bound to the CB particles, whose dynamics is almost the same as for unfilled polymer, (ii) belonging to the polymer chains which are tightly attached to the CB particles, and (iii) belonging to the crystalline phase in the loose polymer chain. The paramagnetic electronic susceptibility of the composite samples, measured by EPR, was interpreted by assuming a contribution of localized spin states that follow a Curie law, and a Pauli-like contribution of delocalized spins. A significant change of the EPR linewidth was observed at 40 K, which is the temperature where the Curie and Pauli susceptibilities equally contribute to the paramagnetic electronic susceptibility. The electrical properties are very sensitive to the preparation methods of the composites, which conditions the interaction between carbon particle-carbon particle and carbon particle-polymer chain. Classical statistic models to describe the conductivity in these media were not satisfactory. © 1998 Published by Elsevier Science B.V. All rights reserved.en
dc.description.affiliationUniversidade de São Paulo IFSC, CP 369, 13560-970 São Carlos, SP
dc.description.affiliationUniversidade Estadual Paulista UNESP, CP 473, 17013-410 Bauru, SP
dc.description.affiliationUniversidade Federal de Minas Gerais ICEx, 31270-901 Belo Horizonte, MG
dc.description.affiliationUnespUniversidade Estadual Paulista UNESP, CP 473, 17013-410 Bauru, SP
dc.format.extent149-160
dc.identifierhttp://dx.doi.org/10.1016/S0167-2738(98)00284-7
dc.identifier.citationSolid State Ionics, v. 113-115, p. 149-160.
dc.identifier.doi10.1016/S0167-2738(98)00284-7
dc.identifier.issn0167-2738
dc.identifier.lattes1802982806436894
dc.identifier.scopus2-s2.0-0032317683
dc.identifier.urihttp://hdl.handle.net/11449/65568
dc.identifier.wosWOS:000077868800022
dc.language.isoeng
dc.relation.ispartofSolid State Ionics
dc.relation.ispartofjcr2.751
dc.relation.ispartofsjr0,856
dc.rights.accessRightsAcesso restrito
dc.sourceScopus
dc.subjectCarbon black
dc.subjectComposite
dc.subjectConductivity
dc.subjectElectron paramagnetic resonance
dc.subjectImpedance spectroscopy
dc.subjectNuclear magnetic resonance
dc.subjectPolymer electrolyte
dc.subjectAmorphization
dc.subjectComposite materials
dc.subjectMagnetic relaxation
dc.subjectMagnetic susceptibility
dc.subjectParamagnetic resonance
dc.subjectPolyelectrolytes
dc.subjectStatistical methods
dc.subjectCurie law
dc.subjectPauli-like contributions
dc.subjectIonic conduction in solids
dc.titleElectric and magnetic properties of polymer electrolyte/carbon black compositesen
dc.typeArtigo
dcterms.licensehttp://www.elsevier.com/about/open-access/open-access-policies/article-posting-policy
dspace.entity.typePublication
unesp.author.lattes1802982806436894
unesp.author.orcid0000-0002-3321-2005[1]
unesp.author.orcid0000-0002-0827-073X[2]
unesp.campusUniversidade Estadual Paulista (Unesp), Instituto de Biociências, Botucatupt
unesp.departmentQuímica e Bioquímica - IBBpt

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