Influence of Process Conditions and Particle Dispersion on the AC Breakdown Strength of Polyethylene-aluminium Oxide Nanocomposites
2015 (English)In: IEEE transactions on dielectrics and electrical insulation, ISSN 1070-9878, E-ISSN 1558-4135, Vol. 22, no 6, 3536-3542 p.Article in journal (Refereed) PublishedText
The voltage level in power transmission systems is increasing in order to transmit energy more efficiently and this requires efficient insulating materials. The dielectric breakdown strength of polymers used as electrical insulation can be increased by the addition of inorganic nanoparticles. A uniform particle dispersion is however important; large agglomerates may have a negative effect on the breakdown strength. The effects of temperature, screw rotation velocity and processing time in a micro-extruder on the dispersion of neat aluminium oxide nanoparticles in LDPE were studied, and it was possible to obtain an essentially agglomerate-free particle dispersion at optimum extrusion conditions. Smaller particle agglomerates (< 3 mu m) had no significantly negative impact on the AC dielectric breakdown strength. Composites with higher filler fractions (>= 3 wt.%) containing larger particle agglomerates (>15 mu m in diameter) showed a significant reduction in the breakdown strength compared to the neat polymer.
Place, publisher, year, edition, pages
IEEE , 2015. Vol. 22, no 6, 3536-3542 p.
polyethylene, aluminium oxide, nanocomposites, processing, particle dispersion, dielectric breakdown
Electrical Engineering, Electronic Engineering, Information Engineering
IdentifiersURN: urn:nbn:se:kth:diva-182798DOI: 10.1109/TDEI.2015.005366ISI: 000368940800056ScopusID: 2-s2.0-84961938137OAI: oai:DiVA.org:kth-182798DiVA: diva2:905867
QC 201602232016-02-232016-02-232016-02-23Bibliographically approved