| 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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Saarimaki, Eetta
VTT Technical Research Centre of Finland
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (22/22 displayed)
- 2024Screening of suitable random copolymer polypropylene blends for HVDC cable insulationcitations
- 2023Molecular Layer Deposition of Polyurea on Silica Nanoparticles and Its Application in Dielectric Nanocompositescitations
- 2023Nano-scale nonwoven fabrics by electrospinning of polylactic acid
- 2021Dielectric performance of silica-filled nanocomposites based on miscible (PP/PP-HI) and immiscible (PP/EOC) polymer blendscitations
- 2021Dielectric Performance of Silica-Filled Nanocomposites Based on Miscible (PP/PP-HI) and Immiscible (PP/EOC) Polymer Blendscitations
- 2021Combining good dispersion with tailored charge trapping in nanodielectrics by hybrid functionalization of silicacitations
- 2021Deposition of Ureido and Methacrylate Functionalities onto Silica Nanoparticles and Its Effect on the Properties of Polypropylene-Based Nanodielectricscitations
- 2021PP/PP-HI/silica nanocomposites for HVDC cable insulationcitations
- 2020Silica surface modification with liquid rubbers & functional groups for new polyolefin-based dielectric nano-composites
- 2020Influence of polar and unpolar silica functionalization on the dielectric properties of PP/POE nanocompositescitations
- 2020Feasibility of Mini-Scale Injection Molding for Resource-Efficient Screening of PP-Based Cable Insulation Nanocompositescitations
- 2020Silica Functionalization: How Does it Affect Space Charge Accumulation in Nanodielectrics Under DC?
- 2020From Laboratory to Industrial Scalecitations
- 2019Silica-Polypropylene Nanocomposites for Film Capacitorscitations
- 2018Airborne Dust from Mechanically Recycled Cotton during Ring Spinning
- 2015Novel thermographic inspection method to detect the moisture in early stage of the water ingress and a procedure to remove the moisture from the composite structure
- 2013New high-quality mined nanomaterials mass produced for plastic and wood-plastic nanocomposites
- 2013PVC-wood composite
- 2009Development of thermographic inspection routine exploiting phase transition of water for moisture detection in aircraft structurescitations
- 2006Novel heat durable electromechanical filmcitations
- 2005Novel heat durable electromechanical filmscitations
- 2005Novel heat durable electromechanical film processingcitations
Places of action
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article
Dielectric performance of silica-filled nanocomposites based on miscible (PP/PP-HI) and immiscible (PP/EOC) polymer blends
Abstract
This study compares different polymer-nanofiller blends concerning their suitability for application as insulating thermoplastic composites for High Voltage Direct Current (HVDC) cable application. Two polymer blends, PP/EOC (polypropylene/ethylene-octene copolymer) and PP/PP-HI (polypropylene/ propylene-ethylene copolymer) and their nanocomposites filled with 2 wt.% of fumed silica modified with 3-aminopropyltriethoxysilane were studied. Morphology, thermal stability, crystallization behavior dynamic relaxation, conductivity, charge trap distribution and space charge behavior were studied respectively. The results showed that the comprehensive performance of the PP/PP-HI composite is better than the one of the PP/EOC composite due to better polymer miscibility and flexibility, as well as lower charging current density and space charge accumulation. Nanosilica addition improves the thermal stability and dielectric properties of both polymer blends. The filler acts as nucleating agent increasing the crystallization temperature, but decreasing the degree of crystallinity. Dynamic mechanical analysis results revealed three polymer relaxation transitions: PP glass transition (β), weak crystal reorientation (α1) and melting (α2). The nanosilica introduced deep traps in the polymer blends and suppressed space charge accumulation, but slightly increased the conductivity. A hypothesis for the correlation of charge trap distribution and polymer chain transition peaks is developed: In unfilled PP/EOC and PP/PP-HI matrices, charges are mostly located at the crystalline-amorphous interface, whereas in the filled PP/EOC/silica and PP/PP-HI /silica composites, charges are mostly located at the nanosilica-polymer interface. Overall, the PP/PP-HI (55/45) nanocomposite with 2 wt.% modified silica and 0.3 wt.% of antioxidants making it a promising material for PP based HVDC cable insulation application with a reduced space charge accumulation and good mechanical properties.