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

TitleDielectric relaxation, ac conductivity and electric modulus in poly(vinylidene fluoride)/ NaY zeolite composites
Author(s)Lopes, A. C.
Costa, C. M.
Sabater i Serra, R.
Neves, I. C.
Gómez Ribelles, J. L.
Lanceros-Méndez, S.
KeywordsPVDF
Zeolite
Nanocomposite
Dielectric behavior
Conductivity
Electric
Electric modulus
Issue date2013
PublisherElsevier
JournalSolid State Ionics
Abstract(s)Poly(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.
TypeArticle
URIhttp://hdl.handle.net/1822/27036
DOI10.1016/j.ssi.2013.01.013
ISSN0167-2738
Peer-Reviewedyes
AccessRestricted access (UMinho)
Appears in Collections:CDF - FCD - Artigos/Papers (with refereeing)

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