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Dielectric behavior of syntactic foams at low temperatures and frequencies

Dielectric behavior of syntactic foams at low temperatures and frequencies
Dielectric behavior of syntactic foams at low temperatures and frequencies
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.
504-507
Andritsch, T.M.
8681e640-e584-424e-a1f1-0d8b713de01c
Lunding, A.
482a5cbf-4897-4c49-ae6b-c8100887edc2
Morshuis, P.H.F.
59248480-efdb-444e-b3f5-b39a3355315a
Negle, H.
89fe898a-82eb-4479-af06-588d5c10b4bc
Smit, J.J.
21d902fe-6d70-4dff-ad29-3eb8146c0ea5
Andritsch, T.M.
8681e640-e584-424e-a1f1-0d8b713de01c
Lunding, A.
482a5cbf-4897-4c49-ae6b-c8100887edc2
Morshuis, P.H.F.
59248480-efdb-444e-b3f5-b39a3355315a
Negle, H.
89fe898a-82eb-4479-af06-588d5c10b4bc
Smit, J.J.
21d902fe-6d70-4dff-ad29-3eb8146c0ea5

Andritsch, T.M., Lunding, A., Morshuis, P.H.F., Negle, H. and Smit, J.J. (2007) Dielectric behavior of syntactic foams at low temperatures and frequencies. Annual Report - Conference on Electrical Insulation and Dielectric Phenomena, 2007 (CEIDP 2007), Canada. 14 - 17 Oct 2007. pp. 504-507 . (doi:10.1109/CEIDP.2007.4451633).

Record type: Conference or Workshop Item (Paper)

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.

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More information

Published date: October 2007
Venue - Dates: Annual Report - Conference on Electrical Insulation and Dielectric Phenomena, 2007 (CEIDP 2007), Canada, 2007-10-14 - 2007-10-17
Organisations: EEE

Identifiers

Local EPrints ID: 354446
URI: https://eprints.soton.ac.uk/id/eprint/354446
PURE UUID: b80a780e-6e92-4cf4-a908-729346467e69
ORCID for T.M. Andritsch: ORCID iD orcid.org/0000-0002-3462-022X

Catalogue record

Date deposited: 21 Oct 2013 11:03
Last modified: 20 Jul 2019 00:38

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