Please use this identifier to cite or link to this item: http://hdl.handle.net/1822/27036

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dc.contributor.authorLopes, A. C.-
dc.contributor.authorCosta, C. M.-
dc.contributor.authorSabater i Serra, R.-
dc.contributor.authorNeves, I. C.-
dc.contributor.authorGómez Ribelles, J. L.-
dc.contributor.authorLanceros-Méndez, S.-
dc.date.accessioned2013-12-16T13:48:20Z-
dc.date.available2013-12-16T13:48:20Z-
dc.date.issued2013-
dc.identifier.issn0167-2738por
dc.identifier.urihttp://hdl.handle.net/1822/27036-
dc.description.abstractPoly(vinylidene fluoride)/zeolite composites prepared by solvent casting at 190ºC have been investigated by scanning electronic microscopy, Fourier transformed infrared spectroscopy and broadband dielectric relaxation spectroscopy. The inclusion of the NaY zeolite filler in the polymer matrix induces the crystallization of poly(vinylidene fluoride), PVDF, in the electroactive γ phase. The dielectric function, ac conductivity and electric modulus of the composites were investigated as a function of zeolite content in the frequency range from 0.1 Hz to 1 107 Hz at temperatures from -120 to 150ºC. The main relaxation process (β-relaxation) of the amorphous phase of the polymer matrix is not affected by the presence of the zeolite, as verified by the similar relaxation parameters obtained for the pure polymer and for the PVDF/NaY4%composite. In a similar way, the zeolite low temperature relaxation is not significantly affected by the polymer phase. On the other hand, the electric modulus formalism reveals significant contributions of the fillers to the electrical permittivity and conductivity of the composites. The presence of the zeolite particles increases a.c. conductivity and the Maxwell-Wagner-Sillars contribution that is predominant at low frequencies with respect to ohmic contribution to permittivity.por
dc.description.sponsorshipThis work is partially funded by the Centre of Physics and Centre of Chemistry (University of Minho, Portugal) and by FEDER funds through the “Programa Operacional Factores de Competitividade - COMPETE” and by national funds by FCT- Fundação para a Ciência e a Tecnologia, project references .NANO/NMed-SD/0156/2007, PTDC/CTM/ 69316/2006, PEst-C/QUI/UI0686/2011 and PTDC/CTM-NAN/112574/2009. A.C.L. and C.M.C. also thanks the FCT for the grant SFRH/BD/62507/2009 and SFRH/BD/68499/2010, respectively. The authors also thank support from the COST Action MP1003, the ‘European Scientific Network for Artificial Muscles’ (ESNAM).por
dc.language.isoengpor
dc.publisherElsevierpor
dc.rightsrestrictedAccesspor
dc.subjectPVDFpor
dc.subjectZeolitepor
dc.subjectNanocompositepor
dc.subjectDielectric behaviorpor
dc.subjectConductivitypor
dc.subjectElectricpor
dc.subjectElectric moduluspor
dc.titleDielectric relaxation, ac conductivity and electric modulus in poly(vinylidene fluoride)/ NaY zeolite compositespor
dc.typearticlepor
dc.peerreviewedyespor
sdum.publicationstatuspublishedpor
oaire.citationStartPage42por
oaire.citationEndPage50por
oaire.citationTitleSolid State Ionicspor
oaire.citationVolume235por
dc.identifier.doi10.1016/j.ssi.2013.01.013-
dc.subject.wosScience & Technologypor
sdum.journalSolid State Ionicspor
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