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The investigation of the permittivity of syntactic foam under varying humidity

The investigation of the permittivity of syntactic foam under varying humidity
The investigation of the permittivity of syntactic foam under varying humidity
The dielectric properties of syntactic foam samples, with emphasis on the complex permittivity, were studied via dielectric spectroscopy. The investigated syntactic foam samples consist of an epoxy matrix, filled with hollow glass spheres of 60 microns diameter on average with a high filler rate of 50% of volume. In order to see the influence of adsorbed water, the filler of one sample type was stored under 80% humidity to create wet samples, while the other samples were constantly kept dry. Previous measurements showed increased DC conductivity for syntactic foam - up to two orders of magnitude compared to conventional filled epoxy. This was suspected to be due to the relative high conductivity of the glass, as well as due to the sheer amount of glass spheres and therefore plenty of interfaces. Recent measurement at lower frequencies (below 10-2 Hz) showed quasi-dc-behavior and virtually no difference for both dry and wet samples at 70degC, while dry samples had generally higher values in permittivity for 40degC. It is shown that the glass spheres overshadow the influence of adsorbed water in the syntactic foam samples measured.
978-1-4244-2548-8
490-493
Andritsch, T.
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.
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., Lunding, A., Morshuis, P.H.F., Negle, H. and Smit, J.J. (2008) The investigation of the permittivity of syntactic foam under varying humidity. CEIDP 2008: Annual Report Conference on Electrical Insulation and Dielectric Phenomena, Canada. 26 - 29 Oct 2008. pp. 490-493 . (doi:10.1109/CEIDP.2008.4772769).

Record type: Conference or Workshop Item (Paper)

Abstract

The dielectric properties of syntactic foam samples, with emphasis on the complex permittivity, were studied via dielectric spectroscopy. The investigated syntactic foam samples consist of an epoxy matrix, filled with hollow glass spheres of 60 microns diameter on average with a high filler rate of 50% of volume. In order to see the influence of adsorbed water, the filler of one sample type was stored under 80% humidity to create wet samples, while the other samples were constantly kept dry. Previous measurements showed increased DC conductivity for syntactic foam - up to two orders of magnitude compared to conventional filled epoxy. This was suspected to be due to the relative high conductivity of the glass, as well as due to the sheer amount of glass spheres and therefore plenty of interfaces. Recent measurement at lower frequencies (below 10-2 Hz) showed quasi-dc-behavior and virtually no difference for both dry and wet samples at 70degC, while dry samples had generally higher values in permittivity for 40degC. It is shown that the glass spheres overshadow the influence of adsorbed water in the syntactic foam samples measured.

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More information

Published date: October 2008
Venue - Dates: CEIDP 2008: Annual Report Conference on Electrical Insulation and Dielectric Phenomena, Canada, 2008-10-26 - 2008-10-29
Organisations: EEE

Identifiers

Local EPrints ID: 354449
URI: https://eprints.soton.ac.uk/id/eprint/354449
ISBN: 978-1-4244-2548-8
PURE UUID: 1359ce76-cfe7-4ede-8270-aa506fab5a06
ORCID for T. Andritsch: ORCID iD orcid.org/0000-0002-3462-022X

Catalogue record

Date deposited: 29 Jul 2013 16:02
Last modified: 06 Jun 2018 12:24

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