Combined effects of humidity and thermal stress on the dielectric properties of epoxy-silica composites

Gonon, P.; Sylvestre, Alain; Teysseyre, J.; Prior, Christophe

doi:10.1016/s0921-5107(01)00521-9

Cited by 58 publications

(47 citation statements)

References 21 publications

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“…From an electrical perspective, the science of nanostructured dielectrics is generally accepted to have begun in 1994, when John Lewis published his seminal paper entitled "Nanometric dielectrics" [2] and, subsequently, such systems have been considered for use in a wide range of electrical applications. These include as high performance insulation systems in power system applications [3], for microelectronic packaging [4], as tailored dielectrics in capacitors [5] and as so-called high k dielectrics for use in applications ranging from organic field-effect transistors to actuators [6].…”

Section: Introductionmentioning

confidence: 99%

The Effects of Water on the Dielectric Properties of Aluminum-Based Nanocomposites

Hosier¹,

Praeger²,

Vaughan

et al. 2017

IEEE Trans. Nanotechnology

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Abstract-A series of polyethylene nanocomposites was prepared utilizing aluminum nitride or alumina nano-powders with comparable morphologies. These were subsequently subjected to different conditioning regimes, namely prolonged storage in vacuum, the ambient laboratory environment or in water. The effect of filler loading and conditioning (i.e. water content) on their morphological and dielectric properties was then examined. Measurements indicated that, in the case of aluminum nitride nanocomposites, none of the conditioning regimes led to significant absorption of water and, as such, neither the dielectric properties nor the DC conductivity varied. Conversely, the alumina nanocomposites were prone to the absorption of an appreciable mass of water, which resulted in them displaying a broad dielectric relaxation, which shifted to higher frequencies, and a higher DC electrical conductivity. We ascribe these different effects to the interfacial surface chemistry present in each system and, in particular, the propensity for hydrogen bonding with water molecules diffusing through the host matrix. Technologically, the use of nanocomposites based upon systems such as aluminum nitride, in place of the commonly used metal oxides (alumina, silica, etc.), eliminates variations in dielectric properties due to absorption of environmental water without resorting to the adoption of techniques such as surface functionalization or calcination in an attempt to render nanoparticle surface chemistry hydrophobic.

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Section: Introductionmentioning

confidence: 99%

The Effects of Water on the Dielectric Properties of Aluminum-Based Nanocomposites

Hosier¹,

Praeger²,

Vaughan

et al. 2017

IEEE Trans. Nanotechnology

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“…24 In the case of thermolysis, bond scission and chemical transformation occur because of the effect of elevated temperatures. 19,24 However, in this study, both processes happened, depending on the exposure time. 6,7,[19][20]31 An increase in the exposure time may facilitate transient oxygen diffusion into the resin system and/or facilitate the chemical decomposition of the three-dimensional network.…”

Section: Degradation Analysismentioning

confidence: 57%

“…22 Thermooxidation implies the transport of oxygen from the surface toward the bulk or the transport of mobile groups from the bulk toward the surface, where they react with oxygen. 11,[19][20][21][22] As a result, below 250 C, the effects of thermooxidation are generally observed to be limited to a few tens of micrometers below the surface. 24 In the case of thermolysis, bond scission and chemical transformation occur because of the effect of elevated temperatures.…”

Section: Degradation Analysismentioning

confidence: 99%

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Thermal degradation analysis of thermoset resins

Chatterjee

2009

J of Applied Polymer Sci

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Dynamic mechanical analysis, thermogravimetric analysis, and dielectric analysis (DEA) were conducted for three thermoset resin systems: bismaleimide, epoxy, and vinyl ester. The resin samples were subjected to various degrees of thermal exposure (400, 270, and 330 C for 5-150 min). Dielectric constants were measured along with the thermomechanical properties. The glasstransition temperature, modulus, and weight loss were important parameters for correlating the material property changes with the heat exposure. A linear relation was determined between the thermomechanical properties and the dielectric properties of the resins under the selected exposure conditions. Therefore, DEA can be introduced as a significant technique for evaluating thermally exposed polymer materials. Interestingly, it is a nondestructive evaluation process. In the future, it could be used for onsite health monitoring of thermally exposed polymer matrix composite structures.

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“…Aging of insulators may be accelerated by large changes in temperature and humidity [4], voltage [5] or corona effect of water drops [6][7][8]. The materials under investigation here are used in indoor devices and are not submitted to outdoor stresses like rain, ice or dust.…”

Section: Introductionmentioning

confidence: 99%

Impact of Water Content on the Electrical Behavior of Epoxy Insulators

Mboungou

Mavon

Friedt

et al. 2008

IEEE Trans. Dielect. Electr. Insul.

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Polymers are widely used in indoor insulation. We analyze three epoxy samples with varying matrix and fillerproperties to determine the influence of water on their insulating properties. We observed a strong dependency of the leakage current and the sample temperature, under electrical stress, on the amount of absorbed water. Trihydrated alumina filler reduced the leakage current and temperature rise under electrical stress.

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Combined effects of humidity and thermal stress on the dielectric properties of epoxy-silica composites

Cited by 58 publications

References 21 publications

The Effects of Water on the Dielectric Properties of Aluminum-Based Nanocomposites

The Effects of Water on the Dielectric Properties of Aluminum-Based Nanocomposites

Thermal degradation analysis of thermoset resins

Impact of Water Content on the Electrical Behavior of Epoxy Insulators

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