Effect of Nanoparticles on the Morphology, Thermal, and Electrical Properties of Low-Density Polyethylene after Thermal Aging

Wang, Youyuan; Wang, Can; Zhang, Zhanxi; Xiao, Kun

doi:10.3390/nano7100320

Cited by 34 publications

(24 citation statements)

References 34 publications

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“…In addition, Grubbs' second-generation catalyst, with better stability and catalytic efficiency, was selected to improve the effect of self-healing, and its concentration accounted for 10 wt.% of the microcapsule. The microcapsule/LDPE composite was prepared by the melt blending method [36]. Due to the demand of self-healing behavior, the microcapsule needed to have the characteristic of rupturing under the stress condition.…”

Section: Preparation Of the Novel Self-healing Polyethylene Insulatinmentioning

confidence: 99%

“…In addition, the pure LDPE sample was prepared according to the original method, to analyze the influence of preparation technology on the typical performance of LDPE. The working pressure was 15 MPa, and the pressing time was 20 minutes [36].…”

Section: Preparation Of the Novel Self-healing Polyethylene Insulatinmentioning

confidence: 99%

“…Insulating material needs to have a smaller dielectric constant and lower dielectric loss to ensure normal insulation effects [36]. The dielectric constant (i.e., permittivity) of the samples was measured by the NOVOCONTROL CONCEPT 80 broadband dielectric measurement system.…”

Section: Characterizationmentioning

confidence: 99%

“…The melting peak (T p ) was negatively correlated with the flexibility of the polymer. Moreover, the polymer with higher crystallinity had a tighter internal structure and smaller free volume, so the flexibility of the molecular chain was lower [36]. Therefore, with the increase in the crystallinity, the T p was increased.…”

Section: Crystallization Characteristicsmentioning

confidence: 99%

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Effect of Doping Microcapsules on Typical Electrical Performances of Self-Healing Polyethylene Insulating Composite

Wang

Zhang

et al. 2019

Applied Sciences

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Polyethylene cables, as important transmission equipment of modern power grid, would inevitably be slightly damaged, which seriously threatens the safety of the power supply. This paper has pioneered the preparation and typical performances of a self-healing polyethylene insulating composite. The self-healing performance to structural damage was verified by tests of electrical and mechanical damage. The effect mechanism of doping microcapsules on the electrical performance of polyethylene was emphatically analyzed. The results show that in appropriate conditions (such as 60 • C/30 min), the composite can not only repair the electrical tree and scratches, but also restore the insulation strength of damaged area. The effect of doping microcapsules on the electrical performances of polyethylene, such as breakdown strength, volumetric resistivity, dielectric properties, and space charge characteristics, are mainly related to impurity and the interface of microcapsule. Polarization and ionization of impurities can reduce the electrical performance of polyethylene. The interface not only improves the microstructure of polyethylene (such as how the heterogeneous nucleation effect increases the number of crystal regions, and the anchoring effect enhances the stability of amorphous regions), but also increases the charge traps. Moreover, the microstructure and charge trap can affect the characteristics of carrier transport, material polarization, and space charge accumulation, thus improving the electrical performance of polyethylene. In addition, the important electrical performance of the composite can meet the basic application requirements of polyethylene insulating material, which has good application prospects.

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Section: Preparation Of the Novel Self-healing Polyethylene Insulatinmentioning

confidence: 99%

Section: Preparation Of the Novel Self-healing Polyethylene Insulatinmentioning

confidence: 99%

Section: Characterizationmentioning

confidence: 99%

Section: Crystallization Characteristicsmentioning

confidence: 99%

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Effect of Doping Microcapsules on Typical Electrical Performances of Self-Healing Polyethylene Insulating Composite

Wang

Zhang

et al. 2019

Applied Sciences

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“…Electrical properties of polymers with different type conductive impurities are investigated for a relatively long time [1][2][3][4][5][6][7][8][9]. In the recent papers, nanoparticles [10][11][12][13][14][15][16][17], in particular nanotubes [18][19][20][21], were used to a greater extent as impurities. In the vast majority of studies on the influence of impurities on the electrical properties of polymers, the study was performed in a wide range of concentrations.…”

Section: Introductionmentioning

confidence: 99%

Dynamics of the conductance temperature dependence for composite based on linear polyethylene with impurity of soot and calcite

Poberezhets¹

2019

Semicond. phys., quantum electron. optoelectron.

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Within the temperature 293 to 425 K and frequency 10 -3 to 10 6 Hz ranges by using the direct and alternating currents, the dynamics of electrical conductance σ of linear polyethylene with the impurity of 20 wt.% soot and 20 wt.% CaCO 3 (calcite) has been investigated. It has been shown that for the solid state of polyethylene (below 380 K), the dependence of electrical conductance on the temperature T on both the direct (σ DC ) and alternating (σ AC ) currents can be described by the power dependence on ( )is the temperature of the phase transition for polyethylene). It has been shown that when being repeatedly measured, the σ DC and σ AC values increase, and the power indexes of temperature dependence decrease. The measured values are stable after the fourth measurement. The greatest changes in the conductance, depending on the first and second measurements (almost three orders of magnitude), were observed at a temperature close to T 0 . It has been assumed that the dynamics of electrical conductance, depending on the number of measurements, is caused by the influence of the electric field on the ordering of impurity in polymer. It has been shown that for T > 380 K, the typical for liquids Arrhenius dependence of σ DC and σ AC on temperature is observed. It has been found that at the first measurement, the temperature dependence of σ DC and σ AC can be described by two activation energies, while for a stable state (starting from the fourth measurement)by one activation energy (within the measurement error of the same for σ DC and σ AC and equal to 1 eV).

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Influence of MgO and ZnO as nano‐additives on the mechanical, microstructural and thermal performance of high‐density polyethylene

Mahmoud

Khalifa

Youssef

et al. 2022

J of Applied Polymer Sci

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Polymer nanocomposites have placed themselves in a highly favorable position in use in practical applications, with materials currently employed in technology related processes. This is because they have improved chemical, physical, morphological, structural, and mechanical properties compared to their polymer microcomposites counterparts or even neat polymer. In this study, two inorganic nanofillers, namely magnesium oxide nanoparticles (MgO NPs) and zinc oxide nanoparticles (ZnO NPs) were separately incorporated into high-density polyethylene (HDPE) by melt blending technique. The ZnO NPs contents in the nanocomposites were set at 1.0, 2.0, 4.0, and 6.0 wt%, while 2.0, 4.0, 6.0, and 8.0 wt % were used by MgO NPs. A comparative study was conducted between different features of the nanocomposites based on their compositions. Such features included mechanical properties, thermal stability, morphological, and structural properties. The as-prepared nanocomposites were proven to be crystalline as confirmed from the XRD. Based on the SEM, both nanofillers were found homogenously dispersed in the HDPE matrix. DSC confirmed that the melting and crystallization behaviors of all nanocomposites were not significantly influenced by the addition of the nanofillers. Tensile tests were performed to determine elastic modulus, tensile stress at yield, tensile stress at break, along with tensile strain at yield values and tensile strain at break. The collected results revealed that loading 2.0 wt% ZnO NPs in the nanocomposites provided elastic modulus up to 237% compared to the pure HDPE. In the case of MgO NPs, as their loading in the nanocomposites reached 4.0 wt%, the elastic modulus increased to 160%. The tensile stress of synthesized nanocomposites increased up to 35.95 ± 2.09 MPa using 2.0 wt% ZnO NPs-filled nanocomposites and up to 28.15 ± 0.91 using 4.0 wt% MgO NPs. Overall, the 2.0 wt% ZnO/HDPE nanocomposite presented better mechanical characteristics in comparison to other tested nanocomposites in this study.

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Effect of Nanoparticles on the Morphology, Thermal, and Electrical Properties of Low-Density Polyethylene after Thermal Aging

Cited by 34 publications

References 34 publications

Effect of Doping Microcapsules on Typical Electrical Performances of Self-Healing Polyethylene Insulating Composite

Effect of Doping Microcapsules on Typical Electrical Performances of Self-Healing Polyethylene Insulating Composite

Dynamics of the conductance temperature dependence for composite based on linear polyethylene with impurity of soot and calcite

Influence of MgO and ZnO as nano‐additives on the mechanical, microstructural and thermal performance of high‐density polyethylene

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