Effect of nano-silica on dielectric properties and space charge behavior of epoxy resin under temperature gradient

Li, Yuanyuan; Tian, Mingliang; Lei, Zhipeng; Zhang, Jianhua

doi:10.1088/1361-6463/aaaf83

Cited by 30 publications

(27 citation statements)

References 42 publications

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“…For example, the dielectric constant of an epoxy thermoset was modified by the incorporation of different oxides systems (titanium dioxide, TiO2, and barium titanate, BaTiO3), 9,10 aluminium flakes, 11 and nano-silica particles. 12 A key feature of the evolution of power systems has been a progressive increase in operating voltage, such that values in excess of 1 MV now constitute a proven technology in some situations. As such, dielectric breakdown strength is an important parameter, since it provides an indication of a material's ability to withstand an applied electric field.…”

Section: Introductionmentioning

confidence: 99%

Functional design of epoxy-based networks: tailoring advanced dielectrics for next-generation energy systems

Saeedi¹,

Vaughan²,

Andritsch³

2019

J. Phys. D: Appl. Phys.

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Epoxy resins are widely used as the primary insulation material in many demanding energyrelated applications. As such, the ability specifically to tailor the electrical performance of such systems to meet increasingly demanding insulation situations has considerable utility. This paper describes a new approach to this problem, which is based upon the controlled introduction of specific functional groups into the cured resin's network architecture. Here, two additives are considered, termed functional network modifiers (FNM), namely glycidyl hexadecyl ether and glycidyl 4-nonylphenyl ether; in all the investigated systems, the ideal stoichiometric ratio of epoxide groups to amine hydrogens is retained. In the case of both FNM, their inclusion resulted in a progressive reduction in the glass transition temperature T g of the system, a reduction in the real part of the permittivity and reduced dielectric losses wihin the accessible frequency range, increased DC conductivity and increased AC breakdown strength. The magnitude of the observed effects are found to be dependent upon the choice of functional modifier, which suggests that such changes are not related merely to the inclusion of an additive within the system, but are also influenced by the chemistry of the additive itself. Explanations for these effects are proposed. It is concluded that the use of such FNM at low concentrations (~4% in the work reported here) offers a novel alternative means of engineering advanced materials to meet the current and future needs in an adaptable and easily implemented manner.

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Section: Introductionmentioning

confidence: 99%

Functional design of epoxy-based networks: tailoring advanced dielectrics for next-generation energy systems

Saeedi¹,

Vaughan²,

Andritsch³

2019

J. Phys. D: Appl. Phys.

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“…The EP composite filled with nano-SiO 2 has improved mechanical and thermal properties [7,24,25]. Although scholars have studied the properties of SiO 2 /EP nanocomposites through experiments [26,27,28,29,30], few involved MD simulations.…”

Section: Introductionmentioning

confidence: 99%

Micro-Structure and Thermomechanical Properties of Crosslinked Epoxy Composite Modified by Nano-SiO2: A Molecular Dynamics Simulation

Xie

Liang

et al. 2018

Polymers

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Establishing the relationship among the composition, structure and property of the associated materials at the molecular level is of great significance to the rational design of high-performance electrical insulating Epoxy Resin (EP) and its composites. In this paper, the molecular models of pure Diglycidyl Ether of Bisphenol A resin/Methyltetrahydrophthalic Anhydride (DGEBA/MTHPA) and their nanocomposites containing nano-SiO 2 with different particle sizes were constructed. The effects of nano-SiO 2 dopants and the crosslinked structure on the micro-structure and thermomechanical properties were investigated using molecular dynamics simulations. The results show that the increase of crosslinking density enhances the thermal and mechanical properties of pure EP and EP nanocomposites. In addition, doping nano-SiO 2 particles into EP can effectively improve the properties, as well, and the effectiveness is closely related to the particle size of nano-SiO 2 . Moreover, the results indicate that the glass transition temperature (T g ) value increases with the decreasing particle size. Compared with pure EP, the T g value of the 6.5 Å composite model increases by 6.68%. On the contrary, the variation of the Coefficient of Thermal Expansion (CTE) in the glassy state demonstrates the opposite trend compared with T g . The CTE of the 10 Å composite model is the lowest, which is 7.70% less than that of pure EP. The mechanical properties first increase and then decrease with the decreasing particle size. Both the Young's modulus and shear modulus reach the maximum value at 7.6 Å, with noticeable increases by 12.60% and 8.72%, respectively compared to the pure EP. In addition, the thermal and mechanical properties are closely related to the Fraction of Free Volume (FFV) and Mean Squared Displacement (MSD). The crosslinking process and the nano-SiO 2 doping reduce the FFV and MSD value in the model, resulting in better thermal and mechanical properties.

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“…Homocharges formation was observed near both the electrodes for all the samples and the amount of homocharges increased with the poling time. The presence of homocharges can be attributed to charge injection from the electrodes in the form of electrons and holes [12]. In the case of alumina‐filled epoxy nanocomposites, a large amount of homocharges injection was observed.…”

Section: Resultsmentioning

confidence: 99%

Understanding the impact of space charge variations with UV‐ and water‐aged epoxy alumina nanocomposites adopting pulsed electroacoustic techniques

Neelmani¹,

Sarathi²,

Suematsu

2020

Micro & Nano Letters

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Effect of nano-silica on dielectric properties and space charge behavior of epoxy resin under temperature gradient

Cited by 30 publications

References 42 publications

Functional design of epoxy-based networks: tailoring advanced dielectrics for next-generation energy systems

Functional design of epoxy-based networks: tailoring advanced dielectrics for next-generation energy systems

Micro-Structure and Thermomechanical Properties of Crosslinked Epoxy Composite Modified by Nano-SiO2: A Molecular Dynamics Simulation

Understanding the impact of space charge variations with UV‐ and water‐aged epoxy alumina nanocomposites adopting pulsed electroacoustic techniques

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