Thermal properties of conducting polypyrrole nanotubes

0452281 - ÚMCH 2016 RIV PL eng J - Journal Article
Rudajevová, A. - Varga, M. - Prokeš, J. - Kopecká, J. - Stejskal, Jaroslav
Thermal properties of conducting polypyrrole nanotubes.
Acta Physica Polonica A. Roč. 128, č. 4 (2015), s. 730-736. ISSN 0587-4246. E-ISSN 1898-794X.
[ISPMA 13 - International Symposium on Physics of Materials /13./. Praha, 31.08.2014-04.09.2014]
R&D Projects: GA ČR(CZ) GA13-00270S
Institutional support: RVO:61389013
Keywords : conducting polymer * polyaniline * polypyrrole
Subject RIV: BM - Solid Matter Physics ; Magnetism
Impact factor: 0.525, year: 2015

Thermal properties of polypyrrole nanotubes synthesized by the chemical oxidation of pyrrole with iron(III) chloride in the presence of methyl orange as structure-guiding template, have been investigated. As-prepared polypyrrole salt and corresponding base were compressed into pellets. Thermogravimetric analysis has shown that the heating/cooling of both polymers is connected with water desorption/re-absorption. This process influences all temperature dependences of the thermophysical properties. The specific heat of both polypyrrole forms was the same at 35°C. The thermal diffusivity of polypyrrole base was lower than that of the salt. The dilatational characteristics are strongly influenced by water desorption/re-absorption. Water desorption is connected with the contraction of polypyrrole and its re-absorption with the expansion of polypyrrole. The electrical resistivity was measured, in analogy to thermal experiments, by a four-point van der Pauw method. The electrical resistivity was 0.016 and 10.2 Ωcm at room temperature, for both materials. The electrical resistivity was also influenced by water desorption/re-absorption as well as other thermophysical properties.
Permanent Link: http://hdl.handle.net/11104/0254836