Evolution of some dielectric properties of polypropylene-nanoclay composites with DC poling

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DOIResolve DOI: http://doi.org/10.1109/CEIDP.2011.6232735
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TypeArticle
Proceedings titleAnnual Report - Conference on Electrical Insulation and Dielectric Phenomena, CEIDP
Conference2011 Annual Report Conference on Electrical Insulation and Dielectric Phenomena, CEIDP 2011, 16 October 2011 through 19 October 2011, Cancun
ISSN0084-9162
Article number6232735
Pages628631; # of pages: 4
SubjectDc conductivity; DC field; Double layers; Interaction zone; Material interfaces; Nano-fillers; Nanofiller; Natural clays; Optimal concentration; Organoclays; Percolation thresholds; Synthetic clays; Total charge; Dielectric materials; Dielectric properties of solids; Electric insulation; Electric space charge; Interfaces (materials); Nanocomposites; Platelets; Thermoplastics; Polypropylenes
AbstractSpace charge and DC conductivity evolution with DC poling of two types of polypropylene-based nanocomposites containing different concentrations of nanofiller were investigated. The two nanofillers used were natural and synthetic organoclays. It was observed that the optimal concentration of a nanofiller for mitigating space charge in polypropylene (PP) is 2-wt% and between 2 and 4-wt% for the natural and synthetic clay, respectively. Excessive quantity of nanofiller could lead to overlapping of the interaction zone of double layers formed at the nanoparticle/host material interfaces, which promotes charge transport. Under DC field this overlapping increases conductivity of a nanocomposite and thus could minimize the benefit of incorporating nanofillers into PP. The total charge stored in unfilled PP increased continuously with time but increased only slightly for filled specimens. After only 504 h of DC poling, at 25 kV/mm, the conductivity of specimens containing 6-wt% of natural clay and 8-wt% of synthetic clay reached ≈ 6 times the level for unfilled PP. This observation could be related to crossing the percolation threshold of these composites. The effect of platelet size on space charge mitigation reported by other authors has been confirmed in this work, i.e. nanofillers with smaller platelets mitigate space charge more efficiently then nanofillers with larger platelets. © 2011 IEEE.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC); NRC Institute for National Measurement Standards (INMS-IENM)
Peer reviewedYes
NPARC number21271339
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Record identifierda3bf3c9-1f43-4096-b813-26a531c99465
Record created2014-03-24
Record modified2016-05-09
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