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Dielectric properties of poly(ethyelene-co-butyl acrylate) filled with Alumina nanoparticles
KTH, School of Electrical Engineering (EES), Electromagnetic Engineering. (ETK)
2011 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

In this work dielectric properties of the poly(ethylene-co-butyl acrylate)filled with alumina nanoparticles are evaluated. These nanocomposite materialswere manufactured at the department of Fibre and Polymer Technology,KTH.This study is limited to the properties of general importance for the AC applications.The dielectric permittivity of the nanocomposite materials wasstudied as a function of filler size, filler content, coating, temperature and airhumidity used for conditioning of the samples. The ultimate goal with thisproject is to describe the influence of material composition, temperature andair humidity on the dielectric properties and model these dependencies.In this thesis the experimental setup for voltage endurance testing of thenanocomposites, namely studying applied voltage frequency dependence ofpartial discharges in electrical trees, with a possibility of following electricaltreeing optically, was developed and described.The dielectric spectroscopy measurements were performed on thoroughly driednanocomposites - so-called dry DS study. It was shown that the experimentaldata can be fitted with Havriliak-Negami approximation, which justifiesthe correctness of the measurement results. It has been shown that addingnanoparticles to the EBA matrix changes the low frequency dispersion significantlyfor the dried samples. It was also indicated that the particle coatingused has very low impact on the resulting permittivity of the thoroughly driedsamples. From the dry DS studies it was suggested that the main cause ofthe scattering in data between the dry samples is most likely the influenceof the material inhomogeneity and possibly the moisture absorption. Thisleads to a possibility of using dielectric spectroscopy as a tool for probing thedispersion of nanoparticles in the polymer matrix.The dielectric spectroscopy measurements were also carried out on the nanocompositesconditioned in the environments with different humidity levels of air inorder to study the influence of absorbed water on the dielectric permittivity- so-called wet DS study. From the wet study it was shown that for the wetsamples the amplitude of the loss peak is defined by the filler size, filler contentand coating used; while its position in frequency domain is determinedby the coating and the humidity level used for conditioning.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology , 2011.
Series
Trita-EE, ISSN 1653-5146 ; 2011:017
Keyword [en]
nanocomposites, poly(ethylene-co-butyl acrylate), EBA, alumina, dielectric permittivity, absorbed water, humidity, temperature, dielectric spectroscopy, partial discharge, electrical treeing
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:kth:diva-31407ISBN: 978-91-7415-900-4OAI: oai:DiVA.org:kth-31407DiVA: diva2:403629
Presentation
2011-03-25, Seminarierummet, KTH, Teknikringen 33, Stockholm, 10:15 (English)
Opponent
Supervisors
Note
QC 20110315Available from: 2011-03-15 Created: 2011-03-14 Last updated: 2011-03-15Bibliographically approved
List of papers
1. Applied voltage frequency dependence of partial discharges in electrical trees
Open this publication in new window or tab >>Applied voltage frequency dependence of partial discharges in electrical trees
2009 (English)In: Proceedings of the 21st Nordic Insulation Symposium, Göteborg, Sweden, 2009, 2009Conference paper (Refereed)
Abstract [en]

 

In this paper the growth of electrical trees in a needleplane electrode arrangement is investigated. Electrical trees are grown in epoxy samples by applying a sinusoidal voltage of 16 kV peak and 17 kV peak. Electrical tree growth is followed under a stereo microscope in real time. As soon as an electrical tree reaches a specific length or shape the aging sequence ends and the partial discharge activity from the trees is investigated at a fixed voltage with frequencies varying between 0.1 to 100 Hz. The frequency dependence of the partial discharge is investigated and related to the different stage and forms of the electrical tree.

National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-31433 (URN)
Note
QC 20110315 Available from: 2011-03-15 Created: 2011-03-15 Last updated: 2011-03-15Bibliographically approved
2. Dielectric properties of alumina-filled poly(ethylene-co-butyl acrylate) nanocomposites
Open this publication in new window or tab >>Dielectric properties of alumina-filled poly(ethylene-co-butyl acrylate) nanocomposites
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2010 (English)In: 2010 Annual Report Conference on Electrical Insulation and Dielectric Phenomena (CEIDP), IEEE , 2010, 5724031- p.Conference paper (Refereed)
Abstract [en]

The dielectric properties of poly (ethylene-co-butyl acrylate) with 13 wt% of butyl acrylate (EBA) filled with alumina nanoparticles (diameter < 50 nm) were studied as a function of particle coating and filler content (2, 6 and 12 wt%). The particles were either unmodified or surface treated either with aminopropyl triethoxysilane or octyltriethoxysilane. The complex permittivity was measured with an IDA200 dielectric spectroscopy analyzer at applied voltage of 200 Vpeak with frequencies varying between 1 mHz and up to 1 kHz at different temperatures (25, 45 and 65°C). Measurements are performed in dry conditions. Pure EBA shows two regions of frequency dispersion in the complex permittivity: a broad relaxation peak in the order of MHz and a characteristic low frequency dispersion that likely is a Maxwell-Wagner response due to a barrier blocking conduction process. Obtained data fits well to a sum of two Havriliak-Negami expressions. Adding nanoparticles to the EBA matrix changes the low frequency dispersion behaviour significantly. Differences in dielectric losses between nanocomposites with different surface treatment seem to be small. The differences in dielectric constant, however, are more pronounced and seem to indicate better dispersion with octylthriethoxysilane surface treatment.

Place, publisher, year, edition, pages
IEEE, 2010
Series
, Conference on Electrical Insulation and Dielectric Phenomena. Annual Report, ISSN 0084-9162
Keyword
Behavioral research, Dielectric devices, Dielectric losses, Dispersions, Ethylene, Nanocomposites, Nanoparticles, Surface treatment
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-31435 (URN)10.1109/CEIDP.2010.5724031 (DOI)2-s2.0-79952934052 (ScopusID)978-142449470-5 (ISBN)
Conference
2010 Annual Report Conference on Electrical Insulation and Dielectric Phenomena, CEIDP 2010; West Lafayette, IN; United States; 17 October 2010 through 20 October 2010
Note

QC 20110315

Available from: 2011-03-15 Created: 2011-03-15 Last updated: 2014-09-03Bibliographically approved
3. Dielectric Properties of Alumina-filled Poly (ethylene-co-butyl acrylate) Nanocomposites Part I - Dry Studies
Open this publication in new window or tab >>Dielectric Properties of Alumina-filled Poly (ethylene-co-butyl acrylate) Nanocomposites Part I - Dry Studies
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2012 (English)In: IEEE transactions on dielectrics and electrical insulation, ISSN 1070-9878, E-ISSN 1558-4135, Vol. 19, no 2, 383-390 p.Article in journal (Refereed) Published
Abstract [en]

The dielectric properties of poly (ethylene-co-butyl acrylate) with 13 wt% of butyl acrylate (EBA) filled with alumina nanoparticles were studied as a function of particle size, particle coating, filler content (2, 6 or 12wt%) and temperature. The particles were either unmodified or surface-treated with either aminopropyltriethoxy silane or octyltriethoxy silane. The complex permittivity was measured with frequencies varying between 1 mHz and up to 1 kHz at different temperatures (25, 45 and 65 degrees C). Measurements were performed in dry conditions. From the dielectric spectroscopy measurements it can be seen that the tan delta for the dry samples is almost independent of the type of the particle coating used. It does, however, depend on the particle size, filler content and temperature.

Keyword
nanocomposite, nanofillers, alumina, poly(ethylene-co-butyl acrylate)
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-31437 (URN)10.1109/TDEI.2012.6180229 (DOI)000303069300002 ()2-s2.0-84860176248 (ScopusID)
Note
QC 20120522Available from: 2011-03-15 Created: 2011-03-15 Last updated: 2013-02-07Bibliographically approved
4. Dielectric Properties of Alumina-filled Poly (ethylene-co-butyl acrylate) Nanocomposites Part II - Wet Studies
Open this publication in new window or tab >>Dielectric Properties of Alumina-filled Poly (ethylene-co-butyl acrylate) Nanocomposites Part II - Wet Studies
Show others...
2012 (English)In: IEEE transactions on dielectrics and electrical insulation, ISSN 1070-9878, E-ISSN 1558-4135, Vol. 19, no 2, 391-399 p.Article in journal (Refereed) Published
Abstract [en]

The influence of moisture on the dielectric properties of different types of poly (ethylene-co-butyl acrylate) filled with alumina nanoparticles was systematically investigated by varying the type of aluminum oxide, particle surface treatment and filler content (2, 6 and 12 wt%). The nanoparticles were either unmodified or surface-treated with either aminopropyl triethoxysilane or octyltriethoxy silane. The complex permittivity was measured with an IDA200 dielectric spectroscopy analyzer at applied voltage of 200 V-peak with frequencies varying between 1 mHz and 1 kHz. The measurements were performed at 25 degrees C and relative air humidities of 24, 54 and 86 %. In order to expand the frequency range the HP 4284A precision LCR meter was used for measuring sample impedance at the frequency range of 100 Hz to 1 MHz. From the frequency dependence of dielectric losses it can be seen that absorbed water plays a significant role in determining the dielectric properties of the nanocomposites. The magnitude of tan delta seems to be determined primarily by the particle size and filler content, while the peak frequency is mostly influenced by the amount of absorbed water and the type of particle coating.

Keyword
nanocomposite, nanofillers, alumina, poly(ethylene-co-butyl acrylate), absorbed water
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-31438 (URN)10.1109/TDEI.2012.6180230 (DOI)000303069300003 ()2-s2.0-84860181612 (ScopusID)
Funder
Swedish Research Council, IFA 2007-5095
Note
QC 20120525Available from: 2011-03-15 Created: 2011-03-15 Last updated: 2013-02-07Bibliographically approved

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