The influence of polymerization time and dopant concentration on the absorption of microwave radiation in conducting polypyrrole coated textiles |
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| Authors: | Akif Kaynak,Eva Hå kansson,Andrew Amiet |
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| Affiliation: | 1. School of Engineering, Deakin University, Geelong, Victoria 3217, Australia;2. Center for Materials and Fiber Innovation, Geelong Technology Precinct, Deakin University, Geelong, Victoria 3217, Australia;3. Defence Science and Technology Organization, Maritime Platforms Division, P.O. Box 4331, Melbourne, Victoria 3001, Australia |
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| Abstract: | Temperature changes in conducting polypyrrole/para-toluene-2-sulphonic acid (PPy/pTSA) coated nylon textiles due to microwave absorption in the 8–9 GHz and 15–16 GHz frequency ranges were obtained by a thermography station during simultaneous irradiation of the samples. The temperature values are compared and related to the amounts of reflection, transmission and absorption obtained with a non-contact free space transmission technique, indicating a relationship between microwave absorption and temperature increase. Non-conductive samples showed no temperature increase upon irradiation irrespective of frequency range. The maximum temperature difference of around 4 °C in the conducting fabrics relative to ambient temperature was observed in samples having 48% absorption and 26.5 ± 4% reflection. Samples polymerized for 60 or 120 min with a dopant concentration of 0.018 mol/l or polymerized for 180 min with a dopant concentration of 0.009 mol/l yielded optimum absorption levels. As the surface resistivity decreased and the reflection levels increased, the temperature increase upon irradiation reduced. |
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| Keywords: | Conducting textiles Polypyrrole (PPy) Thermal imaging Microwave absorption |
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