Investigation on the dielectric properties of nano-titanium dioxide &amp;#x2014; low density polyethylene composites

Li, Shengtao; Yin, Gen; Ni, Fengyan; Bai, Suna; Li, Jianying; Zhang, Tuo

doi:10.1109/icsd.2010.5568106

Cited by 5 publications

(5 citation statements)

References 9 publications

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“…As Figure 6 suggests, the embedded nano particle and associated interface would still be a polarizable system contributing to the overall polarization and dielectric relaxation phenomena of the composite in accord with the suggestions of several authors [11,12,15,20,21,22]. …”

Section: Polyethylene Nano-compositessupporting

confidence: 78%

Charge transport in polyethylene nano dielectrics

Lewis

2014

IEEE Trans. Dielect. Electr. Insul.

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It is emphasized that polyethylene prepared from the melt is a natural nano-dielectric having contrasting conductive crystallites and resistive amorphous regions of nanometric dimensions. The conductive properties when extrinsic holes are introduced are briefly explored. It is predicted that long-range quantum mechanical tunneling through the amorphous regions occurs and is responsible for a field-dependent hole mobility and consequent packet phenomena. It is predicted that nano particles can be naturally accommodated in the amorphous regions and can severely change hole tunneling with a consequent dramatic reduction in the conductivity and related spacecharge phenomena in agreement with published experiments.

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Section: Polyethylene Nano-compositessupporting

confidence: 78%

Charge transport in polyethylene nano dielectrics

Lewis

2014

IEEE Trans. Dielect. Electr. Insul.

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“…A similar behavior of nanocomposites was reported in literature [117] and the relationship between the frequency and temperature at which the peak occurs was attributed to an Arrhenius-type behavior (Equation (5)). In the case of silica-filled LDPE nanocomposites (see herein above), the activation energy was determined using the Arrhenius-type equation (5) (Figure 23d–f).…”

Section: Permittivity and Loss Factor Of Nanocompositessupporting

confidence: 83%

“…The main relaxation in LDPE is α-relaxation attributed to the activation energy of dielectric relaxation (i.e., the orientation energy of the dipoles of the polymer chain and the segments of the polymer chain), which generally occurs at low frequencies. This activation energy is caused by dielectric relaxation and ranges between 1 and 1.5 eV [117]. The estimated activation energies of the silica-filled LDPE nanocomposites correlate well within this interval and increase with the nanoparticles content.…”

Section: Permittivity and Loss Factor Of Nanocompositesmentioning

confidence: 94%

Polyethylene Nanocomposites for Power Cable Insulations

et al. 2018

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This review represents a comprehensive study of nanocomposites for power cables insulations based on thermoplastic polymers such as polyethylene congeners like LDPE, HDPE and XLPE, which is complemented by original results. Particular focus lies on the structure-property relationships of nanocomposites and the materials’ design with the corresponding electrical properties. The critical factors, which contribute to the degradation or improvement of the electrical performance of such cable insulations, are discussed in detail; in particular, properties such as electrical conductivity, relative permittivity, dielectric losses, partial discharges, space charge, electrical and water tree resistance behavior and electric breakdown of such nanocomposites based on thermoplastic polymers are described and referred to the composites’ structures. This review is motivated by the fact that the development of polymer nanocomposites for power cables insulation is based on understanding more closely the aging mechanisms and the behavior of nanocomposites under operating stresses.

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“…In addition, the electrical and mechanical properties of polymers in the interaction zone may be different than those of the polymer matrix. Li and coworkers also believed that there was a potential barrier in the interaction zone which restrained carriers and improved the insulation performance of nanocomposites. Yang and coworkers thought that the addition of nanoparticles generally enhanced the molecular interactions within the epoxy matrix due to strong interactions around nanofillers.…”

Section: Introductionmentioning

confidence: 99%

Epoxy/α‐alumina nanocomposite with decreased dielectric constant and dielectric loss

Chen

Zhang

et al. 2016

Polymer Composites

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In this work, the dielectric spectroscopy and dynamic mechanical thermal spectroscopy of neat epoxy and epoxy nanocomposites modified by boehmite, calumina and a-alumina nanoparticles, respectively, were investigated. The dielectric behavior of epoxy resin was significantly affected by the incorporation of a-alumina nanofiller. The values of real and imaginary part of relative permittivity of epoxy/a-alumina nanocomposite were even lower than these of neat epoxy. On the contrary, these values of boehmite and calumina nanocomposites were higher than these of neat epoxy. The glass transition temperature (T g ) determined by dynamic mechanical thermal analysis (DMA) was obviously decreased when boehmite nanofiller was added into the epoxy nanocomposite. The value of T g was slightly decreased by c-alumina and apparently increased by a-alumina nanofiller. These changes of performance may be attributed to that the existence of a-alumina nanoparticles restricted the mobility of polymer molecular chains. POLYM. COMPOS., 39:2307-2319, FIG. 4. The real part of relative permittivity (er 0 ) as a function of frequency for (a) neat epoxy and epoxy nanocomposites with 2 wt% of (b) boehmite, (c) g-alumina and (d) a-alumina at temperatures from 20 to 1508C. [Color figure can be viewed at wileyonlinelibrary.com]

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Investigation on the dielectric properties of nano-titanium dioxide — low density polyethylene composites

Cited by 5 publications

References 9 publications

Charge transport in polyethylene nano dielectrics

Charge transport in polyethylene nano dielectrics

Polyethylene Nanocomposites for Power Cable Insulations

Epoxy/α‐alumina nanocomposite with decreased dielectric constant and dielectric loss

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