Number of the records: 1
Role of p-benzoquinone in the synthesis of a conducting polymer, polyaniline
- 1.
SYSNO ASEP 0504103 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Role of p-benzoquinone in the synthesis of a conducting polymer, polyaniline Author(s) Bláha, Michal (UMCH-V) RID
Marek, F. (CZ)
Morávková, Zuzana (UMCH-V) RID, ORCID
Svoboda, Jan (UMCH-V) ORCID, RID
Brus, Jiří (UMCH-V) RID, ORCID
Dybal, Jiří (UMCH-V) RID, ORCID
Prokeš, J. (CZ)
Varga, M. (CZ)
Stejskal, Jaroslav (UMCH-V) RID, ORCID, SAISource Title ACS Omega. - : American Chemical Society - ISSN 2470-1343
Roč. 4, č. 4 (2019), s. 7128-7139Number of pages 12 s. Language eng - English Country US - United States Keywords p-benzoquinone ; 2,5-dianilino-p-benzoquinone ; conducting polymers Subject RIV CD - Macromolecular Chemistry OECD category Polymer science R&D Projects GA18-12925S GA ČR - Czech Science Foundation (CSF) Method of publishing Open access Institutional support UMCH-V - RVO:61389013 UT WOS 000466552500116 EID SCOPUS 85064803105 DOI 10.1021/acsomega.9b00542 Annotation 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. Workplace Institute of Macromolecular Chemistry Contact Eva Čechová, cechova@imc.cas.cz ; Tel.: 296 809 358 Year of Publishing 2020 Electronic address https://pubs.acs.org/doi/pdf/10.1021/acsomega.9b00542
Number of the records: 1