Dielectric properties of 3-3 flexible composites by infiltration of elastomers into porous ceramic structures using cellulose scaffold

Dielectric properties of 3-3 flexible composites by infiltration of elastomers into porous ceramic structures using cellulose scaffold

[Display omitted] •Composites from a pre-sintered structure of BaTiO3, ZnO, CoFe2O4, BiFeO3 and BiFeO3-Y, with infiltrated PDMS, are obtained.•The electric responses are determined by impedance spectroscopic analysis, dielectric polarization analysis and breakdown-field (EBD).•The responses of infil...

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Bibliographic Details
Published in:European polymer journal Vol. 180; p. 111616
Main Authors: Levy, Ivana K., Owussu, Francis, Geiger, Thomas, Clemmens, Frank, Nüesch, Frank, Opris, Dorina M., Negri, R. Martín
Format: Journal Article
Language:English
Published: Oxford Elsevier Ltd 05-11-2022
Elsevier BV
Subjects:
3D composites
Barium titanates
Cellulose
Cobalt ferrites
Dielectric breakdown
Dielectric constant
Dielectric losses
Dielectric polarization
Dielectric properties
Dielectrics
Elastomer composites
Elastomers
Electric contacts
Electrical properties
Infiltration
Nanoparticles
Particulate composites
PDMS
Piezoelectricity
Polydimethylsiloxane
Polymers
Scaffolds
Sintering (powder metallurgy)
Yttrium
Zinc oxide
Dielectric constant
Electrical properties
Elastomer composites
Dielectric losses
3D composites
PDMS
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Summary:[Display omitted] •Composites from a pre-sintered structure of BaTiO3, ZnO, CoFe2O4, BiFeO3 and BiFeO3-Y, with infiltrated PDMS, are obtained.•The electric responses are determined by impedance spectroscopic analysis, dielectric polarization analysis and breakdown-field (EBD).•The responses of infiltrated composites and conventional composites are compared and discussed.•The infiltrated composites present larger dielectric constants than the conventional composites.•Dielectric losses (tan δ) remain acceptable low with no significant further decrease in EBD.•A remarkable case is BiFeO3-Y, where the increase of εs is larger than 600 %, while EBD decreases by a factor of 3. Elastomer composites are prepared by infiltrating polydimethylsiloxane (PDMS) into a porous ceramic structure of nanoparticles. This method differs from the conventional approach, where particles are dispersed into the polymer matrix, since here, the polymer is incorporated into a pre-sintered structure of nanoparticles by infiltration under vacuum. Several oxides (CoFe2O4, ZnO, BaTiO3, BiFeO3, and BiFeO3 doped with yttrium), commonly used for dielectric and piezoelectric devices, were infiltrated by PDMS. The porous 3D structure of nanoparticles is obtained by using cellulose as a scaffold and binder, which is eliminated during the process. Thus, the so-called (3,3) composites are obtained, where the particles are in direct contact (although immersed in the polymer), at relatively low loading. The dielectric behaviour of the infiltrated and conventional composites is determined by impedance spectroscopy, dielectric polarization analysis, determinations of electric breakdown-field (EBD), and static dielectric constant (εs). The percentage increase of εs from conventional to infiltrated composites is remarkable, reaching for BiFeO3-Y, an increase of εs and ε′(ω) larger than 600 %, while EBD decreases by a factor of 3.
ISSN:0014-3057
1873-1945
DOI:10.1016/j.eurpolymj.2022.111616