Tree initiation phenomena in nanostructured epoxy composites

Chen, Yu; Imai, T.; Ohki, Yoshimichi; Tanaka, Toshikatsu

doi:10.1109/tdei.2010.5595552

Cited by 65 publications

(20 citation statements)

References 11 publications

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“…When this continuous network is disrupted by the addition of high or low dielectric materials, the electrical resistivity of the epoxy polymer also either increase or decrease. Earlier studies have generalized a mechanism such as the fillers present in the matrix offers “electron treeing” to the electrical field lines, and the extent of the treeing network decides the increase or decrease of the bulk dielectric constant of the composites …”

Section: Resultsmentioning

confidence: 99%

Effect of nano/micro-mixed ceramic fillers on the dielectric and thermal properties of epoxy polymer composites

Vaisakh

Hassanzadeh

Metz

et al. 2013

Polym. Adv. Technol.

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Nano/micro ceramic‐filled epoxy composite materials have been processed with various percentage additions of SiO2, Al2O3 ceramic fillers as reinforcements selected from the nano and micro origin sources. Different types of filler combinations, viz. only nano, only micro, nano/micro, and micro/micro particles, were designed to investigate their influence on the thermal expansion, thermal conductivity, and dielectric properties of epoxy polymers. Thermal expansion studies were conducted using thermomechanical analysis that revealed a two‐step expansion pattern consecutively before and after vitreous transition temperatures. The presence of micro fillers have shown vitreous transition temperature in the range 70–80°C compared with that of nano structured composites in which the same was observed as ~90°C. Similarly, the bulk thermal conductivity is found to increase with increasing percentage of micron‐size Al2O3. It was established that the addition of micro fillers lead to epoxy composite materials that exhibited lower thermal expansion and higher thermal conductivity compared with nano fillers. Moreover, nano fillers have a significantly decisive role in having low bulk dielectric permittivity. In this study, epoxy composites with a thermal expansion coefficient of 2.5 × 10−5/K, thermal conductivity of 1.18 W/m · K and dielectric permittivity in the range 4–5 at 1 kHz have been obtained. The study confirms that although the micro fillers seem to exhibit good thermal conductivity and low expansion coefficient, the nano‐size ceramic fillers are candidate as cofillers for low dielectric permittivity. However, a suitable proportion of nano/micro‐mixed fillers is necessary for achieving epoxy composites with promising thermal conductivity, controlled coefficient of thermal expansion and dielectric permittivity. Copyright © 2013 John Wiley & Sons, Ltd.

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Section: Resultsmentioning

confidence: 99%

Effect of nano/micro-mixed ceramic fillers on the dielectric and thermal properties of epoxy polymer composites

Vaisakh

Hassanzadeh

Metz

et al. 2013

Polym. Adv. Technol.

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“…16,17 And its formation, development and growth are of great importance for the occurrence of partial discharge, space charge etc. [18][19][20][21][22][23] that are vital for the performance of solid insulation materials.…”

Section: Introductionmentioning

confidence: 99%

Treeing phenomenon of thermoplastic polyethylene blends for recyclable cable insulation materials

Zhang

Zhong

et al. 2017

AIP Advances

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Owing to its good recyclability and low processing energy consumption, non-crosslinked polyethylene blends (e.g. LLDPE-HDPE blends) are considered as one of potential environmental-friendly substitutions for crosslinked polyethylene (XLPE) as cable insulation material. Although extensive work has been performed for measuring the basic dielectric properties, there is a lack of the investigations on the aging properties for such a material system, which hinders the evaluation of reliability and lifetime of the material for cable insulation. In this paper, we study the electric aging phenomenon of 0.7LLDPE-0.3HDPE blending material by investigating the treeing behavior, and its comparison with XLPE and LLDPE. Treeing tests show that the 0.7LLDPE-0.3HDPE blends have lower probability for treeing as well as smaller treeing dimensions. Further thermal analysis and microstructure study results suggest that the blends exhibit larger proportion of thick lamellae and higher crystallinity with homogeneously-distributed amorphous region, which is responsible for good anti-treeing performance. Our finding provides the evidence that the 0.7LLDPE-0.3HDPE blends exhibits better electric-aging-retardance properties than XLPE, which may result in a potential application for cable insulation.

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“…3 8 9 The tree growth mechanism was divided into three processes: (1) incubation process, (2) initiation process, and (3) propagation process. 10 If an electrical tree was initiated, it would be propagated rapidly and finally the breakdown occurred. Hence, the initiation time should be delayed and the propagation rate be retarded in order to get excellent insulation polymeric materials.…”

Section: Introductionmentioning

confidence: 99%

AC Electrical Breakdown Phenomena of Epoxy/Layered Silicate Nanocomposite in Needle-Plate Electrodes

Park¹,

Lee²

2013

j nanosci nanotechnol

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Epoxy/layered silicate nanocomposite for the insulation of heavy electric equipments were prepared by dispersing 1 wt% of a layered silicate into an epoxy matrix with a homogenizing mixer and then AC electrical treeing and breakdown tests were carried out. Wide-angle X-ray diffraction (WAXD) analysis and transmission electron microscopy (TEM) observation showed that nano-sized monolayers were exfoliated from a multilayered silicate in the epoxy matrix. When the nano-sized silicate layers were incorporated into the epoxy matrix, the breakdown rate in needle-plate electrode geometry was 10.6 times lowered than that of the neat epoxy resin under the applied electrical field of 520.9 kV/mm at 30 degrees C, and electrical tree propagated with much more branches in the epoxy/layered silicate nanocomposite. These results showed that well-dispersed nano-sized silicate layers retarded the electrical tree growth rate. The effects of applied voltage and ambient temperature on the tree initiation, growth, and breakdown rate were also studied, and it was found that the breakdown rate was largely increased, as the applied voltage and ambient temperature increased.

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Tree initiation phenomena in nanostructured epoxy composites

Cited by 65 publications

References 11 publications

Effect of nano/micro-mixed ceramic fillers on the dielectric and thermal properties of epoxy polymer composites

Effect of nano/micro-mixed ceramic fillers on the dielectric and thermal properties of epoxy polymer composites

Treeing phenomenon of thermoplastic polyethylene blends for recyclable cable insulation materials

AC Electrical Breakdown Phenomena of Epoxy/Layered Silicate Nanocomposite in Needle-Plate Electrodes

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