Conducting polyaniline prepared in the solutions of formic acid: Does functionalization with carboxyl groups occur?

0532426 - ÚFCH JH 2021 RIV NL eng J - Journal Article
Trchová, M. - Jasenská, D. - Bláha, Michal - Prokeš, J. - Stejskal, Jaroslav
Conducting polyaniline prepared in the solutions of formic acid: Does functionalization with carboxyl groups occur?
Spectrochimica Acta Part A-Molecular and Biomolecular Spectroscopy. Roč. 235, JUL 2020 (2020), č. článku 118300. ISSN 1386-1425. E-ISSN 1873-3557
R&D Projects: GA ČR(CZ) GA17-04109S; GA MŠMT(CZ) EF16_013/0001821
Grant - others:GA MŠk(CZ) CZ.02.1.01/0.0/0.0/16_013/0001821
Institutional support: RVO:61388955 ; RVO:61389013
Keywords : oxidative polymerization * aniline oligomers * p-benzoquinone * spectroscopy * nanotubes * mechanism * polymers * films * FTIR spectra * Conducting polymer * Polyaniline * Formic acid * Anthranilic acid
OECD category: Physical chemistry; Polymer science (UMCH-V)
Impact factor: 4.098, year: 2020
Method of publishing: Limited access

Polyaniline is a conducting polymer with an application potential in the field of biomedical engineering. By employing FTIR spectroscopy and conductivity measurements, it has been shown that the oxidation at stoichiometric peroxydisulfate-to-aniline mole ratio 1.25 in the solutions of formic acid in the range 0-10 M provides samples of a moderate conductivity of the orders 0.01-0.1 S cm(-1). They consist of polyaniline and aniline oligomers as typical of the aniline oxidation in weak acids. The detailed investigation of the infrared spectra indicates a partial ring-carboxylation of polyaniline at high acid concentrations. The extent of structural defects is higher for a series prepared at over-stoichiometric peroxydisulfate-to-aniline mole ratio 2.5, which provided only non-conducting samples. The reference sample series represented by poly(aniline-co-o-aminobenzoic acid) was also prepared and is used in the discussion of the infrared spectra. (C) 2020 Elsevier B.V. All rights reserved.
Permanent Link: http://hdl.handle.net/11104/0310922