Journal
SYNTHETIC METALS
Volume 159, Issue 13, Pages 1373-1380Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.synthmet.2009.03.013
Keywords
Conducting textiles; Polypyrrole (PPy); Thermal imaging; Microwave absorption
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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 degrees 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. (C) 2009 Elsevier B.V. All rights reserved.
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