Dielectric response and breakdown behavior of polymer-ceramic nanocomposites: The effect of nanoparticle distribution

Cai, Ziming; Wang, Xiaohui; Luo, Bing; Hong, Wei; Wu, Longwen; Li, Longtu

doi:10.1016/j.compscitech.2017.03.039

Cited by 98 publications

(64 citation statements)

References 44 publications

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“…However, the thermal insulation polymer—PP—blocks the interconnection among Al 2 O 3 particles and thus breaks up the extension of thermal conductive chains. On the contrary, from the micrograph of BT/PP composite in Figure 2 b, it can be seen that although large number of voids and holes existed in low thermal-conductive BT/PP composites, the micrometer-scale BT particles, which are bigger than Al 2 O 3 particles, make it easier for them to touch each other to form a heat conducting network [ 55 ], which leading to relatively higher thermal conductivity of BT/PP composites than that of Al 2 O 3 /PP composites. These results suggest the compact connection or arrangement of filler particles is more advantageous to improve thermal conductive property.…”

Section: Resultsmentioning

confidence: 99%

Synergistic Enhancement of Thermal Conductivity and Dielectric Properties in Al2O3/BaTiO3/PP Composites

Yao

Zhou

et al. 2018

Materials

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Multifunctional polymer composites with both high dielectric constants and high thermal conductivity are urgently needed by high-temperature electronic devices and modern microelectromechanical systems. However, high heat-conduction capability or dielectric properties of polymer composites all depend on high-content loading of different functional thermal-conductive or high-dielectric ceramic fillers (every filler volume fraction ≥ 50%, i.e., ffiller ≥ 50%), and an overload of various fillers (fthermal-conductive filler + fhigh-dielectric filler > 50%) will decrease the processability and mechanical properties of the composite. Herein, series of alumina/barium titanate/polypropylene (Al2O3/BT/PP) composites with high dielectric- and high thermal-conductivity properties are prepared with no more than 50% volume fraction of total ceramic fillers loading, i.e., ffillers ≤ 50%. Results showed the thermal conductivity of the Al2O3/BT/PP composite is up to 0.90 W/m·K with only 10% thermal-conductive Al2O3 filler, which is 4.5 times higher than the corresponding Al2O3/PP composites. Moreover, higher dielectric strength (Eb) is also found at the same loading, which is 1.6 times higher than PP, and the Al2O3/BT/PP composite also exhibited high dielectric constant (εr = 18 at 1000 Hz) and low dielectric loss (tan δ ≤ 0.030). These excellent performances originate from the synergistic mechanism between BaTiO3 macroparticles and Al2O3 nanoparticles.

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Section: Resultsmentioning

confidence: 99%

Synergistic Enhancement of Thermal Conductivity and Dielectric Properties in Al2O3/BaTiO3/PP Composites

Yao

Zhou

et al. 2018

Materials

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“…Following Pitike and Hong, a phase‐field model is developed by drawing an analogy between the dielectric breakdown and mechanical fracture. To characterize the dielectric breakdown behavior of these ferroelectrics, we introduce a scalar phase field s ( x, y, t ).…”

Section: Modelingmentioning

confidence: 99%

Grain‐size–dependent dielectric properties in nanograin ferroelectrics

et al. 2018

Self Cite

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A series of ferroelectric ceramic models with grain and grain‐boundary structures of different sizes are established via Voronoi tessellations. A phase‐field model is introduced to study the dielectric breakdown strength of these ferroelectric ceramics. Afterward, the relation between the electric displacement and electric field and the hysteresis loop are calculated using a finite element method based on a classical and modified hyperbolic tangent model. The results indicate that as the grain size decreases, the dielectric strength is enhanced, but the dielectric permittivity is reduced. The discharge energy density and energy storage efficiency of these ferroelectric ceramics extracted from the as‐calculated hysteresis both increase along with a decrease in their grain size at their breakdown points. However, under the same applied electric field, the ferroelectric ceramic with a smaller grain size possesses a lower discharge energy density but a higher energy storage efficiency. The results suggest that ferroelectric ceramics with smaller grain sizes possess advantages for applications in energy storage devices.

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“…High-performance dielectric materials are attracting signicant attention due to their potential applications in advanced electronic devices such as sensors, transistors, electronic packages and supercapacitors. [1][2][3][4] To meet the practical application requirements, dielectric materials usually need to have high dielectric constants. 5 Polymer-based dielectric materials are considered as promising composite materials, and their dielectric properties can be improved by the addition of different types of llers to meet the abovementioned requirement.…”

Section: Introductionmentioning

confidence: 99%

A reduced graphene oxide–borate compound-loaded melamine sponge/silicone rubber composite with ultra-high dielectric constant

Zhang

Dai

et al. 2019

RSC Adv.

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Dielectric response and breakdown behavior of polymer-ceramic nanocomposites: The effect of nanoparticle distribution

Cited by 98 publications

References 44 publications

Synergistic Enhancement of Thermal Conductivity and Dielectric Properties in Al2O3/BaTiO3/PP Composites

Synergistic Enhancement of Thermal Conductivity and Dielectric Properties in Al2O3/BaTiO3/PP Composites

Grain‐size–dependent dielectric properties in nanograin ferroelectrics

A reduced graphene oxide–borate compound-loaded melamine sponge/silicone rubber composite with ultra-high dielectric constant

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