Correlation between Structure and Dielectric Breakdown in LDPE/HDPE/Clay Nanocomposites

Zazoum, Bouchaib; David, Éric; Ngô, Anh Dung

doi:10.1155/2014/612154

Cited by 8 publications

(7 citation statements)

References 34 publications

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“…The influence of clay on improving the breakdown strength of polymers has been widely discussed among researchers. Zazoum et al [15] observed a consistent improvement of dielectric breakdown strength on LLDPE upon addition of clay up to 20% when 5% clay is incorporated. They related the improvement to the impact of the interface between the polymer matrix and the nanoclay on the space charge distribution and charge densities.…”

Section: Ac Short-term Breakdown Strength a Two-parametermentioning

confidence: 84%

“…They reduce the internal field [13] and alter the space charge distribution within the polymer matrix [14]. Furthermore, the interface between polymer and nanoparticle plays a crucial role in the dielectric breakdown performance [15,16]. The final obtained morphology and the physical and chemical characteristics of the interface are greatly influenced by the dispersion and localization of nanoparticles and the nature of both phases, which will eventually influence the breakdown process by changing the microscale aspects, that is, traps, free volume, and carrier mobility [17].…”

Section: Introductionmentioning

confidence: 99%

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Electrical Breakdown Properties of Clay-Based LDPE Blends and Nanocomposites

Eesaee

David

Demarquette

et al. 2018

Journal of Nanomaterials

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Microstructure and electrical breakdown properties of blends and nanocomposites based on low-density polyethylene (LDPE) have been discussed. A series of LDPE nanocomposites containing different amount of organomodified montmorillonite (clay) with and without compatibilizer have been prepared by means of melt compounding. Two sets of blends of LDPE with two grades of Styrene-Ethylene-Butylene-Styrene block copolymers have been prepared to form cocontinuous structure and host the nanoreinforcement. A high degree of dispersion of oriented clay was observed through X-ray diffraction, scanning, and transmission electron microscopy. This was confirmed by the solid-like behavior of storage modulus in low frequencies in rheological measurement results. An alteration in the morphology of blends was witnessed upon addition of clay where the transportation phenomenon to the copolymer phase resulted in a downsizing on the domain size of the constituents of the immiscible blends. The AC breakdown strength of nanocomposites significantly increased when clay was incorporated. The partially exfoliated and intercalated clay platelets are believed to distribute the electric stress and prolong the breakdown time by creating a tortuous path for charge carriers. However, the incorporation of clay has been shown to diminish the DC breakdown strength of nanocomposites, mostly due to the thermal instability brought by clay.

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Section: Ac Short-term Breakdown Strength a Two-parametermentioning

confidence: 84%

Section: Introductionmentioning

confidence: 99%

Electrical Breakdown Properties of Clay-Based LDPE Blends and Nanocomposites

Eesaee

David

Demarquette

et al. 2018

Journal of Nanomaterials

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“…This observation agrees with results in the literature. 31,[73][74][75][76] The increase in electric strength can be explained by a redistribution of space charge from a modification of NC in the material, resulting in an electrical field uniformity within the nanocomposite. Also, the small distance between NC particles leads to a zigzaging of the electrical tree, that is, it hinders the propagation of the electrical tree in the material.…”

Section: Breakdown Strengthmentioning

confidence: 99%

Characterization of clay-modified thermoset polymers under various environmental conditions for the use in high-voltage power pylons

Kliem

Høgsberg

Wang

et al. 2017

Advances in Mechanical Engineering

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The effect of nanoclay on various material properties like damping and strength of typical thermoset polymers, such as epoxy and vinyl ester, was investigated. Different environmental conditions typical for high-voltage transmission pylons made of composite materials were taken into account. Resin samples were prepared with various clay weight fractions ranging from 0% to 3%. Scanning electron microscopy, transmission electron microscopy, X-ray diffraction and rheological analysis were used to study the morphology and the structure of the nanocomposites. For all nanoclay-modified thermoset polymers, the morphology was found to be of exfoliated structure mainly. Static, uniaxial tensile tests showed that the addition of nanoclay to thermoset polymers led to a beneficial effect on the stiffness, whereas the tensile strength and ductility significantly decreased. When exposed to different environmental conditions, nanoclay was found to have a positive influence on the dynamic properties, analysed by a dynamic mechanical thermal analysis. The addition of nanoclay to the thermoset resin led to an increase of the damping properties by up to 28% for vinyl ester and up to 6% for epoxy at 220°C. The dielectric properties were evaluated by electrical breakdown strength tests resulting in 11% better insulating behaviour for nanoclay-modified vinyl ester.

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“…Figure 6-2, shows a generalized schematic of a degradation process that is relevant to several high-volume commodity thermoplastics including PE. Polymers are susceptible to atmospheric attack by oxygen, especially at elevated temperatures [7-10, 12, 14] and under high loading of energy (electricity, radiation) similar behaviors are noted to exist [18]. Polyethylene has a relatively simple spectrum with few peaks at the carbonyl position.…”

Section: Path Forward and Future Workmentioning

confidence: 99%

Evaluation of Radiation Proofing Polyethylene: Use of Oxygen Scavenging Additives

Magwood

Truong

Washington

2017

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The degradation of polyethylene (PE) from radiation sources with both thermal and nuclear interactions show sensitivities towards oxygen and air. Characterization of the sensitivities in both inert and oxygenated atmospheres can be characterized by thermogravimetric analysis (TGA). Under argon, the thermal degradation of PE follows a random scission pathway that has activation energy of ~229 kJ mol -1 . The activation energy of PE is reduced by ~30% when 1% air is added to the inert argon atmosphere, illustrating the impact of oxygen on the degradation of PE. This effort seeks to diminish degradation of PE waste containment bags and extend their lifetime, thereby, reducing the cost and worker exposure risk. The project evaluated the use of oxygen scavenger nanoparticles to mitigate the deteriorating effects of oxygen on polymer physical properties and reduce polymer degradation. The thermal degradation of PE composites with various additives were tested and two additives showed promising results approaching the activation energy of pristine PE in an inert atmosphere. This activity was sponsored by the EM Office of Technology Development through SRNL's Technical Task Plan SR091701.

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Correlation between Structure and Dielectric Breakdown in LDPE/HDPE/Clay Nanocomposites

Cited by 8 publications

References 34 publications

Electrical Breakdown Properties of Clay-Based LDPE Blends and Nanocomposites

Electrical Breakdown Properties of Clay-Based LDPE Blends and Nanocomposites

Characterization of clay-modified thermoset polymers under various environmental conditions for the use in high-voltage power pylons

Evaluation of Radiation Proofing Polyethylene: Use of Oxygen Scavenging Additives

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