| People | Locations | Statistics |
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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Virtanen, Suvi
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (12/12 displayed)
- 2019Understanding the cross-linking reactions in highly oxidized graphene/epoxy nanocomposite systemscitations
- 2016Dielectric breakdown strength and electrical conductivity of low density polyethylene octylnanosilica composite
- 2015Large-area dielectric breakdown performance of polymer films:Part II: Interdependence of filler content, processing and breakdown performance in polypropylene-silica nanocompositescitations
- 2015Bimodal dielectric nanoparticles and nanocomposites
- 2015Balanced nanocomposite thermosetting materials for HVDC and AC applications
- 2014Structure and dielectric breakdown strength of nano calcium carbonate/polypropylene compositescitations
- 2014Improved dielectric breakdown strength using bimodal functionalized silica nanoparticles
- 2014Dielectric breakdown strength of epoxy bimodal-polymer-brush-grafted core functionalized silica nanocompositescitations
- 2014Influence of low amounts of nanostructured silica and calcium carbonate fillers on the large-area dielectric breakdown performance of bi-axially oriented polypropylenecitations
- 2013Structural studies of dielectric polymer nanocomposites
- 2011Characterization of octamethylsilsesquioxane (CH3)8Si8O12 fillers in polypropene matrix
- 2010Dielectric properties and partial discharge endurance of polypropylene-silica nanocompositecitations
Places of action
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document
Improved dielectric breakdown strength using bimodal functionalized silica nanoparticles
Abstract
Nanodielectrics, or dielectric polymer nanocomposites, can exhibit significant improvements in voltage endurance and dielectric breakdown strength compared to unfilled polymer. This work takes advantage of the large interfacial area between the matrix and the filler as a means to introduce chemistry that can further tailor the dielectric properties of the composite. Our studies show that particle dispersion as well as surface group chemistry contributes to property optimization. The large surface to volume ratio of the filler can be detrimental to dispersion as it can promote agglomeration. This obstacle is overcome by grafting polymer chains to the surface of the filler. Reversible addition fragmentation chain transfer, or RAFT polymerization, is utilized to graft polymer chains to the filler surface and control the molecular weight of the grafted polymer. Various electroactive small molecules (terthiophene, anthracene, and ferrocene) were synthesized and attached to the filler surface as well to create a bimodal type architecture. The filler consists of polyglycidyl methacrylate as matrix compatible long chains and short electroactive groups covalently attached to 15nm silica nanoparticles. The dielectric properties were shown to be altered depending on the nature of the surface group and the extent of dispersion. Using dielectric spectroscopy it was found that permittivity and dielectric breakdown strength of the synthesized composites were notably increased with only 2% loading of filler while retaining a level of dielectric loss comparable to the reference matrix.