Preparation and Insulation Properties of Epoxy-Layered Silicate Nanocomposite

Imai, T.; Sawa, Fumio; Ozaki, T.; Nakano, Toshiyuki; Shimizu, Toshio; Yoshimitsu, Tetsuo

doi:10.1541/ieejfms.124.1065

Cited by 43 publications

(27 citation statements)

References 17 publications

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“…The best results were obtained for compounds modified with nanosilica, whose grain sizes were the smallest. The fact that adding of nanofiller may lead to meaningful elongation of the polymer lifetime under partial discharges has been reported in literature [2,6,7,11,12,24] and is also ascribed to the above mentioned barrier effect which restricts partial discharges penetration (shielding effect) and diminishes the erosion. The water absorption was tested according to ISO 62.…”

Section: Test Resultsmentioning

confidence: 86%

“…The other authors [8,3] found that the electrical strength behaviour due to nanofillers is not so univocal and electrical strength can increase but also decrease. The weakness can be caused by nanoparticles agglomeration or interphase interactions [6,7,12,15,24]. The improvements of electrical strength may be due to well-known scattering mechanism occurring in filled composites [3].…”

Section: Test Resultsmentioning

confidence: 99%

“…Nanoscale dispersion of fillers in the polymer reinforces their mechanical, thermal and dielectrical prop- * corresponding author; e-mail: gornicka@iel.wroc.pl erties compared to neat resins [5,7,8,[15][16][17][18][19][20][21][22][23][24][25][26][27][28]. In the improvement of dielectrical properties both the enhanced scattering of the nanocomposite and mitigation of internal charge may play a role [8].…”

Section: Introductionmentioning

confidence: 99%

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Polyester and Polyesterimide Compounds with Nanofillers for Impregnating of Electrical Motors

Górnicka

Prociów

2009

Acta Phys. Pol. A

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Polyester and polyesterimide compounds for impregnating of electrical motors were modified by incorporating of three kinds of nanofillers: zinc oxide, fumed nanosilica and titanium dioxide so as to improve their properties. Nanosized particles were added at 1 wt.% of loading and homogeneously dispersed in polyester and polyesterimide matrix. The results on mechanical, electrical and barrier properties of standard and nanofilled compounds were compared. Thermogravimetric/differential thermal analysis showed that thermal stability of nanofilled compounds was significantly higher. Also the electrical and bonding strength of nanofilled impregnating compounds increased and at the same time water absorption decreased. The highest improvement of properties owing to nanofillers was obtained in the case of nanosilica.

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Section: Test Resultsmentioning

confidence: 86%

Section: Test Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Polyester and Polyesterimide Compounds with Nanofillers for Impregnating of Electrical Motors

Górnicka

Prociów

2009

Acta Phys. Pol. A

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“…high voltage polymeric cables) [8][9][10][11]. The tree growth mechanism was divided into three processes: (1) process, and (3) propagation process.…”

Section: Introductionmentioning

confidence: 99%

Long-term and Short-term AC Treeing Breakdown of Epoxy/Micro-Silica/Nano-Silicate Composite in Needle-Plate Electrodes

Park¹

2012

Transactions on Electrical and Electronic Materials

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In order to characterize insulation properties of epoxy/micro-silica/nano-silicate composite (EMNC), long-term and short-term AC treeing tests were carried out undr non-uniform electric field generated between needle-plate electrodes. In a long-term test, a 10 kV (60 Hz) electrical field was applied to the specimen positioned between the electrodes with a distance of 2.7 mm in an insulating oil bath at 30℃, and a typical branch type electrical tree was observed in the neat epoxy resin and breakdown took place at 1,042 min after applying the 10 kVelectrical field. Meanwhile, the spherical tree with the tree length of 237 μm was seen in EMNC-65-0.3 at 52,380 min (36.4 day) and then the test was stopped because the tree propagation rate was too low. In the short-term test, an electrial field was applied to a 3.5 mm-thick specimen at an increasing voltage rate of 0.5 kV/s until breakdown in insulating oil bath at 30℃ and 130℃, and the data was estimated by Weibull statistical analysis. The electrical insulation breakdown strength for neat epoxy resin was 1,763 kV/mm at 30℃, while that for EMNC-65-0.3 was 2,604 kV/mm, which was a modified value of 47%. As was expected, the breakdown strength decreased at higher test temperatures.

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“…high voltage polymeric cables) [12][13][14]. The tree growth mechanism is divided into three processes: (1) incubation process, (2) initiation process, and (3) propaga-tion process [15].…”

Section: Introductionmentioning

confidence: 99%

Effect of Amino Silane Coupling Agent on the AC Electrical Breakdown Phenomena of Epoxy/Layered Silicate Nanocomposite in Needle-plate Electrodes

Park

2012

Transactions on Electrical and Electronic Materials

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The effects of amino silane coupling agent on the AC electrical treeing and breakdown behaviors in an epoxy/layered silicate (1 wt%) were examined in needle-plate electrode geometry. A layered silicate was exfoliated in an epoxy base resin by using our AC electric field apparatus. To measure the tree initiation and propagation and the breakdown rate, an alternating current (AC) of 10 kV (60 Hz) was applied to the specimen in needle-plate electrode arrangement with a 30℃ insulating oil bath. In the epoxy/amino silane system, the tree initiation time was 11.5 times higher and the breakdown time was 17.9 times higher than those of the neat epoxy resin. The tree initiation time in the epoxy/layered silicate (1 wt%) system with the amino silane was 2.0 times higher, and the breakdown time was 1.5 times higher than those of the epoxy/layered silicate (1 wt%) system.

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Preparation and Insulation Properties of Epoxy-Layered Silicate Nanocomposite

Cited by 43 publications

References 17 publications

Polyester and Polyesterimide Compounds with Nanofillers for Impregnating of Electrical Motors

Polyester and Polyesterimide Compounds with Nanofillers for Impregnating of Electrical Motors

Long-term and Short-term AC Treeing Breakdown of Epoxy/Micro-Silica/Nano-Silicate Composite in Needle-Plate Electrodes

Effect of Amino Silane Coupling Agent on the AC Electrical Breakdown Phenomena of Epoxy/Layered Silicate Nanocomposite in Needle-plate Electrodes

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