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Characterization of conducting polymer coated fabrics at microwave frequencies

journal contribution
posted on 2009-01-01, 00:00 authored by Akif KaynakAkif Kaynak, E Hakansson
Purpose – The purpose of this paper is to investigate microwave reflection, transmission, and complex permittivity of p-toluene-2-sulfonic acid doped conducting polypyrrole coated nylon-lycra textiles in the 1-18?GHz frequency with a view to potential applications in the interaction of electromagnetic radiation with such coated fabrics.

Design/methodology/approach –
The chemical polymerization of pyrrole is achieved by an oxidant, ferric chloride and doped with p-toluene sulfonic acid (pTSA) to enhance the conductivity and improve stability. Permittivity of the conducting textile substrates is performed using a free space transmission method accompanied by a mathematical diffraction reduction method.

Findings – The real part of permittivity increases with polymerization time and dopant concentration, reaching a plateau at certain dopant concentration and polymerization time. The imaginary part of permittivity shows a frequency dependent change throughout the test range. All the samples have higher values of absorption than reflection. The total electromagnetic shielding effectiveness exceeds 80 percent for the highly pTSA doped samples coated for 3?h.

Originality/value – A non-contact, non-destructive free space method thin flexible specimens to be tested with high accuracy across large frequency range. The non-destructive nature of the experiments enables investigation of the stability of the microwave transmission, reflection, absorption and complex permittivity values. Moreover, mathematical removal of the diffraction enables higher accuracy.

History

Journal

International journal of clothing science and technology

Volume

21

Issue

2-3

Pagination

117 - 126

Publisher

Emerald Group Publishing

Location

Bingley, England

ISSN

0955-6222

eISSN

1758-5953

Language

eng

Notes

Reproduced with the kind permission of the copyright owner.

Publication classification

C1 Refereed article in a scholarly journal; C Journal article

Copyright notice

2009, Emerald Group Publishing

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