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The electrical conduction and dielectric breakdown of polyimide/boron nitride (PI/BN) are investigated in a large temperature range up to 350 °C. This work shows that BN nanofillers act as deep traps for mobile ions. Below 150 °C, the nanostructuration of PI slightly improves the DC conductivity and the breakdown field. On the contrary above 150 °C, while neat PI exhibits ionic space charge contribution...
The impact of boron nitride (BN) nanofillers on the electrical conduction of polyimide/BN (PI/BN) nanocomposite films is investigated at high temperature from 200 to 350 °C. This paper shows that BN nanofillers largely reduce the mobility of ionic charge carriers. While neat PI exhibits space charge on the transient charging currents in this temperature range, PI/BN nanocomposites show a return to...
The nanocomposite materials development represents a very attractive route to upgrade polymer properties commonly used in electrical insulation systems. It was recently shown that some fundamental insulation features such as breakdown strength, partial discharge resistance, treeing lifetime or space charge accumulation may be significantly modified by using nanocharged materials. The origin of these...
Polymer nanocomposites have recently been pointed out to upgrade the organic matrix properties for electrical applications from energy storage to power delivery. By adding a small amount of nanofillers, the electrical, thermal and mechanical properties such as breakdown strength, treeing, Young modulus or lifetime could be greatly modified. This properties change is certainly attributed to nanofillers...
The high temperature dielectric properties and electrical conductivity of polyimide/boron nitride (PI/BN) nanocomposite films are investigated as a function of the BN nanofiller size. Whereas in such a temperature range (up to 350 °C) the electrical properties of neat PI are controlled by ionic motions, which make it a semi-insulating material, it has been highlighted the important role of the BN...
Two kinds of polyimide-boron nitride (PI-BN) nanocomposite have been manufactured by the direct blending process using two different kinds and sizes of BN nanoparticles, referred as BN-1 and BN-2. A high power ultrasonic probe has been used to achieve the dispersion of BN nanoparticles within the polyimide precursor solution. Thermal conductivity has been evaluated for filler volume content up to...
Graphene is a carbon-based allotrope material which, since very few years, appears as very exciting due to incredible physical properties such as a high electron mobility (250,000 cm2/Vs), a high thermal conductivity (5,000 W/mK) and a high Young's modulus (1 TPa). Obtained from the exfoliation of graphite pristine in the form of multilayer graphene (MLG) nanoplatelets, it focuses an increasing attention...
Nanocomposite materials are nowadays widely studied. It is often desired, by the addition of nanoparticles in an insulating matrix, to improve electrical and thermal properties. However, few types of nanoparticles enable improvement of combined electrical and thermal properties. Here the influence of the presence of graphene nanoparticles in an epoxy matrix on space charge accumulation is studied...
A polymer nanocomposite (P-NC) has been manufactured using different processes based on ultrasonication (US) and particles surface treatment. The moisture absorption was detected with different characterization method such as Fourier transform infrared spectroscopy, isothermal thermogravimetric analysis and electrical characterizations. The use of particle surface treatment allows decreasing O-H absorption...
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