DocumentCode :
2998112
Title :
Dielectric behavior of syntactic foams at low temperatures and frequencies
Author :
Andritsch, T.M. ; Lunding, A. ; Morshuis, P.H.F. ; Negle, H. ; Smit, J.J.
Author_Institution :
Delft Univ. of Technol., Delft
fYear :
2007
fDate :
14-17 Oct. 2007
Firstpage :
504
Lastpage :
507
Abstract :
Syntactic foam is a lightweight composite consisting of hollow particles embedded in a polymer resin matrix. In this paper, results are presented of dielectric spectroscopy measurements on test specimens of syntactic foam with glass micro-spheres partially filled with SO2 . This type of syntactic foam is intended to be used as a high performance insulating material for lightweight high-voltage DC applications. The dielectric spectroscopy results showed an anomalous non-Debye behavior in a temperature range from roughly -140degC to +40degC. With increasing temperature the losses decrease at first, until they suddenly increase again at about +40degC. It has to be noted that the overall losses were quite high, compared to the base material. It appears that either the increased dc conductivity, the interfacial polarization at the interfaces between glass and epoxy, or both are the reason for these overall high losses. It is pointed out that the anomalous relaxation peak shifts to lower temperatures when the frequency is increased, contrary to normal behavior. In addition, a merge of two relaxation peaks is visible for higher frequencies at around 70degC, tentatively explained as being caused by the phase transition of SO2.
Keywords :
dielectric losses; dielectric polarisation; dielectric relaxation; electrical conductivity; foams; dc conductivity; dielectric behavior; dielectric spectroscopy; insulating material; interfacial polarization; lightweight high-voltage DC applications; non-Debye behavior; phase transition; syntactic foams; Dielectric materials; Dielectric measurements; Dielectrics and electrical insulation; Electrochemical impedance spectroscopy; Frequency; Glass; Polymer foams; Resins; Temperature; Testing;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Electrical Insulation and Dielectric Phenomena, 2007. CEIDP 2007. Annual Report - Conference on
Conference_Location :
Vancouver, BC
Print_ISBN :
978-1-4244-1482-6
Electronic_ISBN :
978-1-4244-1482-6
Type :
conf
DOI :
10.1109/CEIDP.2007.4451633
Filename :
4451633
Link To Document :
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