Dielectric relaxation and ionic conduction in 66%Silica/CW229-3/HW229-1 microcomposite polymer

Rain, Pascal; Lesaint, Olivier; Céline, Rigaud

doi:10.1016/j.compositesb.2015.03.090

Cited by 9 publications

(4 citation statements)

References 33 publications

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“…Figure 5(e) shows the variation of T g and T d with microsensor content. The T g of SRDs gradually increases with the microsensor content, indicating that the motion of epoxy molecular segments is significantly restricted in SRDs [48], which is consistent with the above analysis. Moreover, the reduced free volume due to the incorporation of microsensors could also induce the enhancement of T g .…”

Section: Role Of Microsensor Encapsulation On the Electrical Properti...supporting

confidence: 87%

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Endowing smart self-reporting epoxy composites with superior electrical properties from ultralow-content electron-donating encapsulated microsensors

Gao

Zhang

et al. 2023

J. Phys. D: Appl. Phys.

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Smart self-reporting dielectrics (SRDs) have been extensively utilized for intelligentizing and miniaturizing the next-generation advanced electrical and electronic devices. However, the switchable structures toward the self-reporting function commonly injure electrical properties, severely undermining the reliability and practicality of SRDs. Herein, the smart self-reporting function and superior electrical properties are simultaneously achieved singly through incorporating ultralow content microsensors with electron-donating encapsulation into the epoxy matrix. The microsensor is a leuco dye system for self-reporting temperature anomalies through thermochromism. The strong electron-donating melamine–formaldehyde encapsulation of microsensors serves to confine the switchable structures and enhance electrical properties by constructing the interfacial barrier effect through triboelectrification. Under an ultralow doping content of 0.5phr, the electrical conductivity of SRDs is considerably reduced by about 80% at the elevated temperature of 80 °C compared to that of the widely recognized epoxy insulation. The reduction efficiency is far superior to those of numerous micro- and nanofillers. The interfacial barrier effect could be supported by the significantly reduced trapped charge density and trap levels in SRDs based on thermal stimulated depolarization current results. Consequently, the charge injection and transport in SRDs could be distinctly inhibited, realizing the enhancement of electrical properties. The results in this study could provide a facile and efficient strategy for achieving high-performance smart self-reporting dielectrics, which is appealing and vital for widespread applications of SRDs.

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Section: Role Of Microsensor Encapsulation On the Electrical Properti...supporting

confidence: 87%

“…Principally, the TSDC spectra reflect the relaxation of polarized dipoles as well as the accumulated space charge [47,48]. The current peaks above the glass transition temperature of polymers are mainly attributed to the release of trap charges injected in the polarization processes [49].…”

Section: Role Of Microsensor Encapsulation On the Electrical Properti...mentioning

confidence: 99%

Endowing smart self-reporting epoxy composites with superior electrical properties from ultralow-content electron-donating encapsulated microsensors

Gao

Zhang

et al. 2023

J. Phys. D: Appl. Phys.

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“…As shown in Figure 6, the imaginary part of the modulus exhibits welldefined peaks at temperatures higher than 150 °C, which shift towards higher frequencies as temperature increases. A similar trend has been observed in various insulating polymers and seems to be ascribed to the ionic hopping: at frequencies below the relaxation peak of M'' charge carriers are mobile over long distances (quasi-ohmic regime), while at higher frequencies they are confined by higher potential barriers and their motion is inhibited [21][22][23]. This ionic long-range hopping is induced by long distance molecular motion, the relative relaxation process is thermally activated and closely related to the glass transition [22] and it is usually visible for T > Tg.…”

Section: Dielectric Analysissupporting

confidence: 77%

Characterization of dielectric properties and conductivity in encapsulation materials with high insulating filler contents

Cornigli

Reggiani

Gnudi

et al. 2018

IEEE Trans. Dielect. Electr. Insul.

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The properties of different molding-compound materials with high filler contents have been investigated in order to assess their electrical properties. The experimental part of the present work has been focused on dielectric spectroscopy and steady-state conduction measurements. The results have been used to investigate the electrical properties of the materials at different frequencies, temperatures and electric fields. Differences in the relaxation kinetics with increasing filler content have been found, which can be ascribed to the larger interface regions between the filler particles. In addition, the extracted conductivities show a hopping transport and different activation energies on the temperature range from 20 ºC to 190 ºC.

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“…Tsekmes et al have indicated that nano-micro composites have superior electrical and thermal properties. It is an industrial practice to use 60-70 wt.% of micron-sized silica as filler in epoxy-based insulating material [12,13]. Imai et al have stated that silica micro fillers have lower thermal expansion coefficient [14].…”

Section: Introductionmentioning

confidence: 99%

Investigation on space charge and charge trap characteristics of gamma‐irradiated epoxy micro–nano composites

et al. 2020

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Epoxy nano-micro composite specimen prepared with micro silica and ion trapping nanoparticle, by shear mixing process, was exposed to gamma radiation and its performance for space charge and charge trap characteristics were analysed. The threshold for space charge accumulation of epoxy nanocomposites reduces and rate of space charge accumulation increases with an increase in dosage of gamma irradiation. The average growth of space charge density during poling and charge decay rate during depoling are relatively higher for gamma-irradiated specimens than the virgin specimen. The initial surface potential has a marginal reduction with increase in the dosage of gamma radiation, but the surface potential decay rate has increased significantly. Trap distribution characteristics indicate more number of shallow traps and increase in charge mobility after irradiation. The relative permittivity and loss tangent of the specimens have high impact due to gamma irradiation. The activation energy calculated from DC conductivity by Arrhenius law reduces with increment in radiation dose. Laser-induced breakdown spectroscopy reflected no change in elemental composition with gamma-irradiated specimen. The variation in plasma temperature and ion line to atomic line intensity ratio with dosage of gamma radiation have direct correlation to the Vickers hardness number of the specimens.

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Dielectric relaxation and ionic conduction in 66%Silica/CW229-3/HW229-1 microcomposite polymer

Cited by 9 publications

References 33 publications

Endowing smart self-reporting epoxy composites with superior electrical properties from ultralow-content electron-donating encapsulated microsensors

Endowing smart self-reporting epoxy composites with superior electrical properties from ultralow-content electron-donating encapsulated microsensors

Characterization of dielectric properties and conductivity in encapsulation materials with high insulating filler contents

Investigation on space charge and charge trap characteristics of gamma‐irradiated epoxy micro–nano composites

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