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Change in dielectric properties in the microwave frequency region of polypyrrole-coated textiles during aging

Hakansson, Eva, Kaynak, Akif and Kouzani, Abbas 2016, Change in dielectric properties in the microwave frequency region of polypyrrole-coated textiles during aging, Materials, vol. 9, no. 7, Article number : 609, pp. 1-13, doi: 10.3390/ma9070609.

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Title Change in dielectric properties in the microwave frequency region of polypyrrole-coated textiles during aging
Author(s) Hakansson, Eva
Kaynak, Akif
Kouzani, Abbas
Journal name Materials
Volume number 9
Issue number 7
Season Article number : 609
Start page 1
End page 13
Total pages 13
Publisher MDPI
Place of publication Basel, Switzerland
Publication date 2016
ISSN 1996-1944
Keyword(s) Science & Technology
Technology
Materials Science, Multidisciplinary
Materials Science
microwave
dielectric constant
aging
ELECTRICAL-CONDUCTIVITY
POLYANILINE
FILMS
DEGRADATION
POLYMERS
FABRICS
Summary Complex permittivity of conducting polypyrrole (PPy)-coated Nylon-Lycra textiles ismeasured using a free space transmission measurement technique over the frequency range of1–18 GHz. The aging of microwave dielectric properties and reflection, transmission and absorptionfor a period of 18 months is demonstrated. PPy-coated fabrics are shown to be lossy over thefull frequency range. The levels of absorption are shown to be higher than reflection in the testedsamples. This is attributed to the relatively high resistivity of the PPy-coated fabrics. Both the dopantconcentration and polymerisation time affect the total shielding effectiveness and microwave agingbehaviour. Distinguishing either of these two factors as being exclusively the dominant mechanismof shielding effectiveness is shown to be difficult. It is observed that the PPy-coated Nylon-Lycrasamples with a p-toluene sulfonic acid (pTSA) concentration of 0.015 M and polymerisation times of60 min and 180 min have 37% and 26% decrease in total transmission loss, respectively, upon agingfor 72 weeks at room temperature (20 C, 65% Relative humidity (RH)). The concentration of thedopant also influences the microwave aging behaviour of the PPy-coated fabrics. The samples with ahigher dopant concentration of 0.027 mol/L pTSA are shown to have a transmission loss of 32.6% and16.5% for short and long polymerisation times, respectively, when aged for 72 weeks. The microwaveproperties exhibit better stability with high dopant concentration and/or longer polymerization times.High pTSA dopant concentrations and/or longer polymerisation times result in high microwaveinsertion loss and are more effective in reducing the transmission and also increasing the longevity ofthe electrical properties.
Language eng
DOI 10.3390/ma9070609
Field of Research 099999 Engineering not elsewhere classified
Socio Economic Objective 970109 Expanding Knowledge in Engineering
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2016, The Authors
Free to Read? Yes
Use Rights Creative Commons Attribution licence
Persistent URL http://hdl.handle.net/10536/DRO/DU:30086176

Document type: Journal Article
Collections: School of Engineering
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Every reasonable effort has been made to ensure that permission has been obtained for items included in DRO. If you believe that your rights have been infringed by this repository, please contact drosupport@deakin.edu.au.