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Effect of morphology on electrical treeing in low density polyethylene nanocomposites

Alapati, Sridhar and Meledath, Joy Thomas and Karmarkar, Ajay (2014) Effect of morphology on electrical treeing in low density polyethylene nanocomposites. In: IET SCIENCE MEASUREMENT & TECHNOLOGY, 8 (2). pp. 60-68.

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Official URL: http://dx.doi.org/10.1049/iet-smt.2012.0032


Influence of polymer morphology on the inception and the growth of electrical trees in unfilled low density polyethylene (LDPE) as well as LDPE filled with 1, 3 and 5% by weight nanoalumina samples stressed with 50 Hz ac voltage has been studied. It is seen that there is a significant improvement in tree inception voltage with filler loading in LDPE filled with nanoparticles. Tree inception voltage increased with the filler loading up to 3% by weight nanoalumina loading and showed a reduction at 5% by weight loading. Change in tree growth patterns from branch to bush as well as a slower tree growth with increase in filler loading in LDPE alumina nanocomposites were observed. The degree of crystallinity and change in crystalline morphology induced by the presence of alumina nanoparticles in LDPE was studied using differential scanning calorimetry (DSC) and scanning electron microscopy (SEM). DSC results show a similar melting behaviour for both unfilled LDPE and LDPE nanocomposites. However, there is a reduction in the degree of crystallinity for LDPE filled with 5% by weight nanoalumina. An increase in lamellae packing with increase in filler loadings and a highly disordered spherulitic structure for LDPE filled with 5% by weight nanoalumina was observed from the SEM images. The slow propagation of tree growth as well as reduction in tree inception voltage with increase in filler loadings were attributed to the morphological changes observed in the LDPE nanocomposites.

Item Type: Journal Article
Additional Information: Copyright for this article belongs to the INST ENGINEERING TECHNOLOGY-IET, ENGLAND
Department/Centre: Division of Electrical Sciences > Electrical Engineering
Date Deposited: 12 Jun 2014 10:32
Last Modified: 12 Jun 2014 10:32
URI: http://eprints.iisc.ac.in/id/eprint/49195

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