Permittivity measurement of thermoplastic composites at elevated temperature

Ku, Harry S. and Horsfield, Brendan and Ball, James A. R. and Siores, Elias (2001) Permittivity measurement of thermoplastic composites at elevated temperature. Journal of Microwave Power and Electromagnetic Energy, 36 (2). pp. 101-111. ISSN 0832-7823


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[Abstract]: The material properties of greatest importance in microwave processing of a dielectric are the complex relative permittivity Epsilon = Epsilon' - jEpsilon'', and the loss tangent, tan Delta = Epsilon'/Epsilon''. This paper describes two convenient laboratory based methods to obtain Epsilon', Epsilon'' and hence tan Delta of fibre-reinforced thermoplastic (FRTP) composites. One method employs a microwave network analyser in conjunction with a waveguide transmission technique, chosen because it provides the widest possible frequency range with high accuracy. The values of the dielectric constant and dielectric loss of glass fibre reinforced (33%) low density polyethylene, LDPE/GF (33%), polystyrene, PS/GF (33%), and Nylon 66/GF (33%), were obtained. Results are compared with those obtained by another method using a high-temperature dielectric probe.

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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: No response from publisher to copyright request.
Faculty / Department / School: Historic - Faculty of Engineering and Surveying - Department of Mechanical and Mechatronic Engineering
Date Deposited: 11 Oct 2007 01:04
Last Modified: 02 Jul 2013 22:44
Uncontrolled Keywords: fibre reinforced thermoplastics, loss tangent, complex relative permitivity, network analyser
Fields of Research : 09 Engineering > 0912 Materials Engineering > 091202 Composite and Hybrid Materials

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