The influence of polymerization time and dopant concentration on the absorption of microwave radiation in conducting polypyrrole coated textiles
| Autor: | Eva Håkansson, Andrew Amiet, Akif Kaynak |
|---|---|
| Rok vydání: | 2009 |
| Předmět: |
Materials science
Dopant Mechanical Engineering Metals and Alloys Analytical chemistry Concentration effect Molar absorptivity Condensed Matter Physics Polypyrrole Electronic Optical and Magnetic Materials chemistry.chemical_compound chemistry Mechanics of Materials Electrical resistivity and conductivity Polymer chemistry Materials Chemistry Irradiation Absorption (electromagnetic radiation) Microwave |
| Zdroj: | Synthetic Metals. 159:1373-1380 |
| ISSN: | 0379-6779 |
| DOI: | 10.1016/j.synthmet.2009.03.013 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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