Abstract
The oxidation of aniline with silver nitrate in 1 mol L−1 acetic acid at 20 °C yielded a composite of two conducting components, polyaniline and silver; the acceleration with 1 mol% of p-phenylenediamine is needed for efficient synthesis. The yield and molecular weight increased when aniline was copolymerized with 10 mol% p-phenylenediamine. Such product displayed metallic conductivity below 180 K and semiconductor type above this temperature. As the result, the conductivity was the same at 100 and 300 K. The oxidation of p-phenylenediamine alone with silver nitrate also produced a conducting composite having the conductivity of 1,750 S cm−1 despite the assumed nonconductivity of poly(p-phenylenediamine). The present study demonstrates that all oxidations proceeded also in frozen reaction mixtures at −24 °C, i.e., in the solid state. In most cases, molecular weights of polymer component increased, the conductivity of composites with silver improved, to 2,990 S cm−1 for poly(p-phenylenediamine)–silver, and remained high after deprotonation with 1 mol L−1 ammonium hydroxide.
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The support from the Ministry of Education, Youth and Sports of the Czech Republic (MSM 0021620834 and LA09028) is gratefully acknowledged. Thanks are due to P. Holler from the Institute of Macromolecular Chemistry for the determination of molecular weights.
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Bober, P., Stejskal, J., Trchová, M. et al. The preparation of conducting polyaniline–silver and poly(p-phenylenediamine)–silver nanocomposites in liquid and frozen reaction mixtures. J Solid State Electrochem 15, 2361–2368 (2011). https://doi.org/10.1007/s10008-011-1414-8
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DOI: https://doi.org/10.1007/s10008-011-1414-8