Understanding the electrical, thermal, and mechanical properties of epoxy magnesium oxide nanocomposites

Peddamallu, Nagachandrika; Guvvala, Nagaraju; Sridharan, K.; Ramachandran, V.; Vasa, Nilesh J.; Nakayama, Tadachika; Sarathi, R.

doi:10.1049/iet-smt.2018.5514

Cited by 8 publications

(4 citation statements)

References 27 publications

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“…The bar graph (Figure b) shows the tensile strength distribution of the m -ABA-SiO 2 /CE nanocomposite tested multiple times. It can be explained that the addition of m -ABA-SiO 2 nanoparticles will improve the density of crosslinking points of polymer molecular chains and increase the cohesive energy of the molecules, thereby making the entire structure more compact and difficult to destroy. , Due to the continuous increase of m -ABA-SiO 2 nanoparticles, they cannot be well dispersed in CE-based nanocomposite materials. The agglomerated part introduces physical defects and hinders the entanglement between molecular chains, thereby increasing the local free volume and reducing its tensile properties …”

Section: Results and Discussionmentioning

confidence: 99%

Voltage-Stabilizer-Grafted SiO₂ Increases the Breakdown Voltage of the Cycloaliphatic Epoxy Resin

et al. 2021

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Cycloaliphatic epoxy (CE) resin plays a vital role in insulation equipment due to its excellent insulation and processability. However, the insufficient ability of CE to confine electrons under high voltage often leads to an electric breakdown, which limits its wide applications in high-voltage insulation equipment. In this work, the interface effect of inorganic nano-SiO 2 introduces deep traps to capture electrons, which is synergistic with the inherent ability of the voltage stabilizer m -aminobenzoic acid ( m -ABA) to capture high-energy electrons through collision. Therefore, the insulation failure rate is reduced owing to doping of the functionalized nanoparticles of the m -ABA-grafted nano-SiO 2 ( m -ABA-SiO 2 ) into the CE. It is worth noting that the breakdown field strength of this m -ABA-SiO 2 /CE reaches 53 kV/mm, which is 40.8% higher than that of pure CE. In addition, the tensile strength and volume resistivity of m -ABA-SiO 2 /CE are increased by 29.1 and 140%, respectively. Meanwhile, the glass transition temperature was increased by about 25 °C and reached 213 °C. This work proves that the comprehensive performance of CE-based nanocomposites is effectively improved by m -ABA-SiO 2 nanoparticles, showing great application potential in high-voltage insulated power equipment.

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Section: Results and Discussionmentioning

confidence: 99%

Voltage-Stabilizer-Grafted SiO₂ Increases the Breakdown Voltage of the Cycloaliphatic Epoxy Resin

et al. 2021

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“…After laser irradiation to the epoxy nanocomposites, the plasma temperature can be calculated by using obtained spectra using Boltzmann–Saha equation, by assuming local thermal equilibrium as shown in the following equation:

T_{e} = 1.44 (][, \frac{E_{2} - E_{1}}{\ln ()(, ()(, I_{1} λ_{1} A_{2} g_{2}) / ()(, I_{2} λ_{2} A_{1} g_{1}))})

where E 1 and E 2 are the energy level values during the excited state, g 1 and g 2 represent the excited energy levels statistical weights, A 1 and A 2 indicate the transition probability values, I 1 and I 2 correspond to the intensities of considered atomic species at the wavelengths λ 1 and λ 2 , and T e indicates the calculated the plasma temperature [33].…”

Section: Resultsmentioning

confidence: 99%

“…where E 1 and E 2 are the energy level values during the excited state, g 1 and g 2 represent the excited energy levels statistical weights, A 1 and A 2 indicate the transition probability values, I 1 and I 2 correspond to the intensities of considered atomic species at the wavelengths λ 1 and λ 2 , and T e indicates the calculated the plasma temperature [33]. The calculated plasma temperature for virgin and thermally aged epoxy nanocomposites is given in Table 2.…”

Section: Libs Studiesmentioning

confidence: 99%

Understanding the thermal ageing performance of epoxy aluminium nitride nanocomposites through space charge studies and by LIBS analysis

Guvvala

Babu

Sarathi

2020

IET Science, Measurement &Amp; Technology

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Epoxy aluminium nitride (AlN) nanocomposites were prepared to understand the influence of thermal ageing on dielectric and space charge performance of the material. It is observed that the real relative permittivity values of epoxy AlN nanocomposites are higher than epoxy resin when wt% of AlN is >1 wt%. Also, the epoxy AlN nanocomposites depicted an increase in dielectric loss compared to the neat epoxy specimen. The space charge variations in the test specimens are analysed by adopting a pulse electro-acoustic technique. It is observed that the nanocomposites have lesser space charge in the bulk volume of insulating material compared with pure epoxy resin. Also, it is realised that the local electric field is less with nanocomposite material in both virgin and thermally aged specimens. The threshold electric field is observed to be lesser with epoxy resin compared to nanocomposites. Laser-induced breakdown spectroscopy (LIBS) analysis clearly indicates the reduction in plasma temperature with epoxy AlN nanocomposites compared to pure epoxy resin. Principle component analysis (PCA) has classified the nanocomposite materials having different filler concentrations from the pure epoxy resin, qualitatively based on their LIBS spectra. Thermally aged epoxy AlN nanocomposites are successfully classified from unaged nanocomposite specimens, using PCA.

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“…A comprehensive study on the behavior of MgO epoxy composite in terms of electrical, thermal, and mechanical properties was published by Peddamallu et al [ 142 ]. Their investigation shows that the higher the MgO concentration the higher the relative permittivity of the composite.…”

Section: Selected Technical Applications Of Magnesium Oxidementioning

confidence: 99%

Synthesis, Properties, and Selected Technical Applications of Magnesium Oxide Nanoparticles: A Review

Hornak

2021

IJMS

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In the last few decades, there has been a trend involving the use of nanoscale fillers in a variety of applications. Significant improvements have been achieved in the areas of their preparation and further applications (e.g., in industry, agriculture, and medicine). One of these promising materials is magnesium oxide (MgO), the unique properties of which make it a suitable candidate for use in a wide range of applications. Generally, MgO is a white, hygroscopic solid mineral, and its lattice consists of Mg2+ ions and O2− ions. Nanostructured MgO can be prepared through different chemical (bottom-up approach) or physical (top-down approach) routes. The required resultant properties (e.g., bandgap, crystallite size, and shape) can be achieved depending on the reaction conditions, basic starting materials, or their concentrations. In addition to its unique material properties, MgO is also potentially of interest due to its nontoxicity and environmental friendliness, which allow it to be widely used in medicine and biotechnological applications.

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Understanding the electrical, thermal, and mechanical properties of epoxy magnesium oxide nanocomposites

Cited by 8 publications

References 27 publications

Voltage-Stabilizer-Grafted SiO₂ Increases the Breakdown Voltage of the Cycloaliphatic Epoxy Resin

Voltage-Stabilizer-Grafted SiO₂ Increases the Breakdown Voltage of the Cycloaliphatic Epoxy Resin

Understanding the thermal ageing performance of epoxy aluminium nitride nanocomposites through space charge studies and by LIBS analysis

Synthesis, Properties, and Selected Technical Applications of Magnesium Oxide Nanoparticles: A Review

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Understanding the electrical, thermal, and mechanical properties of epoxy magnesium oxide nanocomposites

Cited by 8 publications

References 27 publications

Voltage-Stabilizer-Grafted SiO2 Increases the Breakdown Voltage of the Cycloaliphatic Epoxy Resin

Voltage-Stabilizer-Grafted SiO2 Increases the Breakdown Voltage of the Cycloaliphatic Epoxy Resin

Understanding the thermal ageing performance of epoxy aluminium nitride nanocomposites through space charge studies and by LIBS analysis

Synthesis, Properties, and Selected Technical Applications of Magnesium Oxide Nanoparticles: A Review

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Product

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Voltage-Stabilizer-Grafted SiO₂ Increases the Breakdown Voltage of the Cycloaliphatic Epoxy Resin

Voltage-Stabilizer-Grafted SiO₂ Increases the Breakdown Voltage of the Cycloaliphatic Epoxy Resin