Dielectric properties of the polymer–matrix composites based on the system of Co-modified potassium titanate–polytetrafluorethylene

Gorshkov, Nikolay; Гоффман, В. Г.; Vikulova, María; Burmistrov, IN; Ковнев, А. В.; Gorokhovsky, Alexander

doi:10.1177/0021998317703692

Cited by 20 publications

(22 citation statements)

References 35 publications

(43 reference statements)

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“…To increase the PTFE permittivity, a lot of various fillers such as rutile, Mg 2 SiO 4, TeO 2, CeO 2, Sr 2 Ce 2 Ti 5 O 16 , or Sm 2 Si 2 O 7 have been investigated and permittivity values in the range of ε' = 3.4–6.3 are achieved. In our previous work, the permittivity of ε' = 6.8–7.5 at 1 MHz for cobalt‐modified PPT has been found when filler content was about 40–50 wt %.…”

Section: Resultsmentioning

confidence: 89%

“…SEM images of the PTFE powder obtained by drying the parent dispersion (a), PPT‐Fe powder treated in the aqueous dispersion of PTFE (b) and the composite based on this system containing 50 wt % of the ceramic filler after compression: planar (c) and cross‐sectional (d) images. [Color figure can be viewed at wileyonlinelibrary.com]…”

Section: Resultsmentioning

confidence: 99%

“…In presented work, the permittivity of 11 at 1 MHz and of about 10 3 at DC have been found (the dielectric losses were 0.02 and 2.16, respectively). This is primarily due to the intrinsic dielectric constant of the filler (for iron‐modified PPT ε' = 93 at 1 MHz and for cobalt‐modified PPT ε' = 25 at 1 MHz, but also higher permittivity is indirectly associated with a smaller particle size of the filler (average size of agglomerates of iron modified PPT is of 2–10 μm [Figure (a)] and average size of agglomerates of cobalt‐modified PPT is about 20 μm) and therefore a larger interface area.…”

Section: Resultsmentioning

confidence: 99%

“…That is why they can be considered as promising fillers for the PTFE‐matrix functional composites. PTFE composite filled with cobalt modified PPT shown the excelled permittivity in range of other kinds of ceramic dielectric‐PTFE composites ( ε' = 6.8–7.5 at 1 MHz and PPT content about 40–50 wt %). However, permittivity of iron‐modified PPT ( ε' = 93 at 1 MHz) is superior for the cobalt‐modified PPT ( ε' = 25 at 1 MHz) due to very effective polarizability of iron compounds because one is a typical transition metal and it can form compounds in a wide range of oxidation states −2 to +7 and also can form many coordination compounds.…”

Section: Introductionmentioning

confidence: 89%

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Polytetrafluorethylene‐based high‐k composites with low dielectric loss filled with priderite (K_1.46Ti_7.2Fe_0.8O₁₆)

Gorshkov

Гоффман

Vikulova

et al. 2019

J of Applied Polymer Sci

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Composite materials with a high permittivity (high‐k) and low dielectric loss represent an important research direction for the rapid development of modern electronic. This article is about high‐k composite with low dielectric loss (dielectric constant is approximately 11, and dielectric loss is only 0.02 at 1 MHz and about 50 wt % of filler) based on a polytetrafluorethylene (PTFE) compounded with priderite (K1.46Ti7.2Fe0.8O16). The dielectric permittivity about ε' ≈ 103 and the dielectric loss of tgδ ≈ 2 have been found for filler content about 50 wt % (30 vol %) and, respectively, ε' ≈ 11 and tgδ ≈ 0.02 for 1 MHz. To produce filler, amorphous potassium polytitanate was synthesized by molten salt method, modified in aqueous solution of iron sulfate, crystallized at 700 °C and further treated in the aqueous dispersion of PTFE. The obtained product was pressured, dried and investigated by X‐ray diffraction and scanning electron microscopy. Dielectric properties of the composite with different ceramic filler content (1–90 wt %) were studied using impedance spectroscopy in the frequency range of 10−2 to 106 Hz. The influence of frequency on electric conductivity, permittivity, and dielectric losses was analyzed taking into account the experimental data on porosity, apparent density obtained for the composites. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020, 137, 48762.

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Section: Resultsmentioning

confidence: 89%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 89%

See 2 more Smart Citations

Polytetrafluorethylene‐based high‐k composites with low dielectric loss filled with priderite (K_1.46Ti_7.2Fe_0.8O₁₆)

Gorshkov

Гоффман

Vikulova

et al. 2019

J of Applied Polymer Sci

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“…It was shown the patterns of composites permittivity increasing with the filler content increasing. 18,19 It should be noted that the using of ceramics with such hollandite-like structure allows producing the PMMA-matrix composites without chemical treatment of filler surface.…”

Section: Introductionmentioning

confidence: 99%

Dielectric properties of PMMA/KCTO(H) composites for electronics components

Vikulova

Tsyganov

Bainyashev

et al. 2021

J of Applied Polymer Sci

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Polymethyl methacrylate/hollandite-like copper doped potassium titanate high-k ceramics composites with different filler content (20-60 vol.%) are prepared by simple method of mixing of the polymer solution and ceramics dispersion followed evaporation of the solvent and hot pressing. The particle morphology and size are estimated by SEM. The composites obtained are studied by XRD, FTIR, and TGA methods. The influence of the additive and the concentration of hollandite-like copper doped potassium titanate high-k ceramics on dielectric properties (permittivity, conductivity, dielectric loss tangent) are investigated at frequency range from 10 À1 to 10 6 Hz. It is shown that the increasing of ceramics concentration cause the increasing of main dielectric characteristics, namely permittivity up to 40 and dielectric loss up to 0.13 at 60 vol.% of filler and 0.1 Hz. Conductivity percolation threshold for PMMA/KCTO(H) composites was estimated (v c = 0.0773 vol. [20.9 wt. %]).Experimental data on permittivity are compared with different theoretical models (Lichtenecker's model and the Effective Medium Theory model).

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Dielectric Elastomer Architectures with Strain‐Tunable Permittivity

O’Neill

Sessions

Arora

et al. 2022

Adv Materials Technologies

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than their intrinsic material constituents. Metamaterials concepts have been demonstrated in diverse fields, including electromagnetics, acoustics, mechanics and others, exhibiting novel properties such as negative refractive index, perfect absorption, and auxetic behavior. [1][2][3][4][5] Further, metamaterials can be designed with flexible and reconfigurable substrates to achieve physically tunable responses. For instance, several examples of origami and deployable structures exhibit adaptive electromagnetic resonance tuning through physical deformation. [6][7][8][9][10] Strain-tunable dielectric materials and composites are a growing research field with recent demonstrations in optical and millimeter wave regimes. [11,12] For instance, Meerbeek et al., described the macroscopic shape of a porous elastomeric foam by measuring the shift in light reflected internally by its cellular voids during bending and twisting. [11] Zhang et al., synthesized a graphene foam with tunable microwave absorption via solid matrix densification during physical compression. [13] Additional mechanisms for strain-tuning dielectric properties include the use of permanent or induced dipoles at the molecular level; and the distribution of voids and inclusions in host matrices. [14][15][16] Elastomeric metamaterials present a deformation-based tuning strategy for regulating local periodicity and effective dielectric properties. This strategy is particularly useful in deformable electromagnetic devices where the feature size of the dielectric architecture is electrically small and physical reconfiguration of the dielectric structure will facilitate localized and controllable tuning. [14] Materials with mechanically reconfigurable dielectric properties can help address these inherent challenges for flexible hybrid electronics (FHEs) and adaptive communication devices.Elastomers have previously been leveraged for mechanical metamaterials, which are a subset of metamaterial designs with periodic architectures whose elements rotate, buckle, fold, or snap under an external load. [17] Mechanical instabilities present in many of these structures allow their rapid transformation under relatively low strains. They demonstrate unique properties like auxetic behavior, energy absorption, multistability, and nonlinear elastic properties. [18][19][20][21][22][23][24][25] The transformation of these mechanical structures provides a straightforward tuning mechanism for surrounding wave properties in optical, acoustic, and Flexible hybrid electronic (FHE) materials and devices exploit the interaction of mechanical and electromagnetic properties to operate in new form factors and loading environments, which are key for advancing wearable sensors, flexible antennas, and soft robotic skin technologies. Dielectric elastomer (DE) architectures offer a novel substrate material for this application space as they are a class of strain-tolerant and programmable metamaterials that derive their mechanical and dielectric properties from their architecture. Due to the...

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Dielectric properties of the polymer–matrix composites based on the system of Co-modified potassium titanate–polytetrafluorethylene

Cited by 20 publications

References 35 publications

Polytetrafluorethylene‐based high‐k composites with low dielectric loss filled with priderite (K_1.46Ti_7.2Fe_0.8O₁₆)

Polytetrafluorethylene‐based high‐k composites with low dielectric loss filled with priderite (K_1.46Ti_7.2Fe_0.8O₁₆)

Dielectric properties of PMMA/KCTO(H) composites for electronics components

Dielectric Elastomer Architectures with Strain‐Tunable Permittivity

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Dielectric properties of the polymer–matrix composites based on the system of Co-modified potassium titanate–polytetrafluorethylene

Cited by 20 publications

References 35 publications

Polytetrafluorethylene‐based high‐k composites with low dielectric loss filled with priderite (K1.46Ti7.2Fe0.8O16)

Polytetrafluorethylene‐based high‐k composites with low dielectric loss filled with priderite (K1.46Ti7.2Fe0.8O16)

Dielectric properties of PMMA/KCTO(H) composites for electronics components

Dielectric Elastomer Architectures with Strain‐Tunable Permittivity

Contact Info

Product

Resources

About

Polytetrafluorethylene‐based high‐k composites with low dielectric loss filled with priderite (K_1.46Ti_7.2Fe_0.8O₁₆)

Polytetrafluorethylene‐based high‐k composites with low dielectric loss filled with priderite (K_1.46Ti_7.2Fe_0.8O₁₆)