Nanoparticle dispersion and distribution in XLPE and the related DC insulation performance

Wang, Shihang; Chen, Peixing; Yu, Shihu; Zhang, Peng; Li, Jianying; Li, Shengtao

doi:10.1109/tdei.2018.007156

Cited by 38 publications

(27 citation statements)

References 22 publications

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“…It is speculated to be caused by more impurities in samples with more nanoparticles, and electric resistivity may be significantly reduced if more nanoparticles are added. As to the breakdown strength, a very important parameter of insulating materials, it reached the maximum at a relatively low nanofiller content as reported [13,19,20]. Therefore, a wide range of physics properties of epoxy/TiO 2 nanocomposites including maximum service temperature should all be considered to determine the best loading content of nano-TiO 2 in the engineering application as high voltage insulating materials.…”

Section: Discussionmentioning

confidence: 99%

“…The charge trap characteristic is an important property for polymer insulating materials, and it reflects the effect of molecular motion and defects on the transport of charge carriers under an electric field. Different charge trap characteristics will modulate different insulating properties [13,14]. By comparing the surface potential of the epoxy sample and TiO2-1 wt.% sample, it illustrates that nano-TiO2 doping decreased the speed of surface potential decay.…”

Section: Charge Trapmentioning

confidence: 95%

“…The introduction of nano-SiO 2 modified by poly(propylene glycol)bis(2-aminopropyl ether) can increase the T g slightly, no more than 6 • C [10]. There are few reports indicating that a composite metal-oxide nanofiller has led to a significant increase Materials 2020, 13 in T g of epoxy resins. In terms of engineering application, the existing methods to increase the T g have limited effect.…”

Section: Introductionmentioning

confidence: 99%

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Effects of Functionalized Nano-TiO2 on the Molecular Motion in Epoxy Resin-Based Nanocomposites

Wang

et al. 2020

Materials

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Epoxy resin-based nanocomposites have been widely researched for being potential insulating materials in high voltage power equipment. In this paper, nano-TiO2 particles were chosen and surface-modified by a silane coupling agent containing an epoxy group. The effect of functionalized nano-TiO2 doping on the physical properties of epoxy resin was studied. The results of differential scanning calorimetry show that Tg increased significantly and can be increased by up to 35 °C. Therefore, it is believed that the suppression of molecular motion by the addition of nanofillers works effectively in the case of this functionalized nano-TiO2 and a strong interaction between the epoxy resin and the nano-TiO2 was formed after surface modification. Consequently, dynamic mechanical properties, thermal conductivity, electrical conductivity, and trap characteristics of epoxy resin are all adjusted after introducing functionalized nano-TiO2. All of these physical properties were analyzed from the perspective of suppression of molecular motion, and it is of significance to establish the theory of a nanocomposite dielectric. Besides, the results show that the epoxy/TiO2 nanocomposite is expected to be applied in the insulation system of electrical equipment.

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Section: Discussionmentioning

confidence: 99%

Section: Charge Trapmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

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Effects of Functionalized Nano-TiO2 on the Molecular Motion in Epoxy Resin-Based Nanocomposites

Wang

et al. 2020

Materials

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“…It is widely reported that grafting non-polar silane onto the nanoparticle surface can reduce water absorption, and the influence of its chain length was investigated [12,19,20]. Silane coupling agents (SCA) are commonly used in composite materials to increase the compatibility between inorganic fillers and polymers, and an improved particle dispersion can be obtained by silane functionalising the filler surface [21]. The selection of SCA is usually based on the compatibility between its organofunctional group and the polymer matrix, e.g.…”

Section: Introductionmentioning

confidence: 99%

Effect of water on the breakdown and dielectric response of polypropylene/nano-aluminium nitride composites

et al. 2020

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The influence of water immersion and silane treatment on the AC breakdown and the complex dielectric response of polypropylene/nano-aluminium nitride (PP/nano-AlN) composites has been investigated. The as-received filler was examined to have a nanoscale particle distribution with a hexagonal shape and slight hydrolysation. Grafting the aluminium nitride with an octyl silane reduces the weight increase in samples filled with 10 wt% of aluminium nitride during water immersion by 3, from 0.29 to 0.09%. The results suggest that the AC breakdown strength and complex permittivity of ''wet'' composite samples are related to the silane treatment of the nanofiller. The AC breakdown strength of octyl silane-treated samples after 9 days of water immersion shows comparable results to the dry samples, while a reduction can be seen on non-treated samples. Although silane-treated samples still show an increased dielectric loss at low frequency after water immersion, a significant reduction in low-frequency dispersion of real and imaginary permittivity can be seen when compared to the non-treated composites. This indicates that significant gains can be obtained for PP/nano-AlN composites by suitable silane treatments.

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“…Therefore, higher requirements have been put forward for the physical and chemical properties of PTFE materials. With the development of nanotechnology, nanocomposites have been widely used in the field of insulation dielectrics [11]. Polymer nanocomposites bring about significant improvements in various properties.…”

Section: Introductionmentioning

confidence: 99%

Molecular Dynamics Simulation of Improving the Physical Properties of Polytetrafluoroethylene Cable Insulation Materials by Boron Nitride Nanoparticle under Moisture-Temperature-Electric Fields Conditions

2019

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The physical properties in amorphous regions are important for the insulation aging assessment of polytetrafluoroethylene (PTFE) cable insulation materials. In order to study the effect of boron nitride (BN) nanoparticles on the physical properties of PTFE materials under moisture, temperature, and electric fields conditions at the molecular level, the amorphous region models of PTFE, BN/PTFE, water/PTFE, and water/BN/PTFE were respectively constructed by molecular dynamics (MD) simulation. The mechanical properties including Young’s modulus, Poisson’s ratio, bulk modulus, and shear modulus, along with glass transition temperature, thermal conductivity, relative dielectric constant, and breakdown strength of the four models have been simulated and calculated. The results show that the mechanical properties and the glass transition temperature of PTFE are reduced by the injection of water molecules, whereas the same, along with the thermal conductivity, are improved by incorporating BN nanoparticles. Moreover, thermal conductivity is further improved by the surface grafting of BN nanoparticles. With the increase of temperature, the mechanical properties and the breakdown strength of PTFE decrease gradually, whereas the thermal conductivity increases linearly. The injection of water molecules increases the water content in the PTFE materials, which causes a gradual increase in its relative dielectric constant. This work has shown that this effect is significantly reduced by incorporation of BN nanoparticles. The variation of physical properties for PTFE and its composites under the action of moisture, temperature, and electric fields is of great significance to the study of wet, thermal, and electrical aging tests as well as the life prediction of PTFE cable insulation materials.

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Nanoparticle dispersion and distribution in XLPE and the related DC insulation performance

Cited by 38 publications

References 22 publications

Effects of Functionalized Nano-TiO2 on the Molecular Motion in Epoxy Resin-Based Nanocomposites

Effects of Functionalized Nano-TiO2 on the Molecular Motion in Epoxy Resin-Based Nanocomposites

Effect of water on the breakdown and dielectric response of polypropylene/nano-aluminium nitride composites

Molecular Dynamics Simulation of Improving the Physical Properties of Polytetrafluoroethylene Cable Insulation Materials by Boron Nitride Nanoparticle under Moisture-Temperature-Electric Fields Conditions

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