Role of p-benzoquinone in the synthesis of a conducting polymer, polyaniline

0504103 - ÚMCH 2020 RIV US eng J - Journal Article
Bláha, Michal - Marek, F. - Morávková, Zuzana - Svoboda, Jan - Brus, Jiří - Dybal, Jiří - Prokeš, J. - Varga, M. - Stejskal, Jaroslav
Role of p-benzoquinone in the synthesis of a conducting polymer, polyaniline.
ACS Omega. Roč. 4, č. 4 (2019), s. 7128-7139. ISSN 2470-1343. E-ISSN 2470-1343
R&D Projects: GA ČR(CZ) GA18-12925S
Institutional support: RVO:61389013
Keywords : p-benzoquinone * 2,5-dianilino-p-benzoquinone * conducting polymers
OECD category: Polymer science
Impact factor: 2.870, year: 2019
Method of publishing: Open access
https://pubs.acs.org/doi/pdf/10.1021/acsomega.9b00542

Polyaniline (PANI) and 2,5-dianilino-p-benzoquinone both are formed by oxidation of aniline in an acidic aqueous environment. The aim of this study is to understand the impact of addition of p-benzoquinone on the structure of PANI prepared by the oxidation of aniline hydrochloride with ammonium peroxydisulfate and to elucidate the formation of low-molecular-weight byproducts. An increasing yield and size-exclusion chromatography, Fourier-transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy, and nuclear magnetic resonance analyses of the products show that p-benzoquinone does not act as a terminating agent in the synthesis of PANI and the content of 2,5-dianilino-p-benzoquinone increases with the increasing molar concentration of p-benzoquinone in the reaction mixture, [BzQ]. Regarding the structure of PANI, Raman and UV–visible spectra show that the doping level and the charge delocalization both decrease with the increase of [BzQ], and the FTIR spectra of the PANI bases indicate an increased concentration of benzenoid units at higher [BzQ]. We explain these observations by an increasing concentration of structural defects in PANI chains and propose a 2,5-dianilino-p-benzoquinone-like structure of these defects present as pendant groups. The bands typical of 2,5-dianilino-p-benzoquinone-like moiety are observed even in the vibrational spectra of the sample prepared without addition of p-benzoquinone. This confirms in situ oxidation of aniline to p-benzoquinone within the course of the oxidation of aniline hydrochloride to PANI.
Permanent Link: http://hdl.handle.net/11104/0296285