Chemical Oxidative Polymerization of Methylene Blue: Reaction Mechanism and Aspects of Chain Structure.

Autor: Mezhuev YO; Department of Biomaterials, Mendeleev University of Chemical Technology of Russia, 125047 Moscow, Russia., Vorobev IY; Department of Biomaterials, Mendeleev University of Chemical Technology of Russia, 125047 Moscow, Russia., Plyushchii IV; Department of Biomaterials, Mendeleev University of Chemical Technology of Russia, 125047 Moscow, Russia., Krivoborodov EG; Department of Biomaterials, Mendeleev University of Chemical Technology of Russia, 125047 Moscow, Russia., Artyukhov AA; Department of Biomaterials, Mendeleev University of Chemical Technology of Russia, 125047 Moscow, Russia., Motyakin MV; Emanuel Institute of Biochemical Physics, Russian Academy of Sciences, 119334 Moscow, Russia.; Semenov Federal Research Center for Chemical Physics, Russian Academy of Sciences, 119991 Moscow, Russia., Luss AL; Department of Biomaterials, Mendeleev University of Chemical Technology of Russia, 125047 Moscow, Russia., Ionova IS; Semenov Federal Research Center for Chemical Physics, Russian Academy of Sciences, 119991 Moscow, Russia., Kovarskii AL; Emanuel Institute of Biochemical Physics, Russian Academy of Sciences, 119334 Moscow, Russia., Derevnin IA; Department of Biomaterials, Mendeleev University of Chemical Technology of Russia, 125047 Moscow, Russia., Dyatlov VA; Department of Biomaterials, Mendeleev University of Chemical Technology of Russia, 125047 Moscow, Russia., Alekperov RA; Department of Biomaterials, Mendeleev University of Chemical Technology of Russia, 125047 Moscow, Russia., Toropygin IY; V.N. Orekhovich Research Institute of Biomedical Chemistry, Russian Academy of Medical Sciences, 119832 Moscow, Russia., Volkov MA; A.N. Frumkin Institute of Physical Chemistry and Electrochemistry of the Russian Academy of Sciences, 119071 Moscow, Russia., Shtilman MI; Department of Biomaterials, Mendeleev University of Chemical Technology of Russia, 125047 Moscow, Russia., Korshak YV; Department of Biomaterials, Mendeleev University of Chemical Technology of Russia, 125047 Moscow, Russia.
Jazyk: angličtina
Zdroj: Polymers [Polymers (Basel)] 2021 Jun 30; Vol. 13 (13). Date of Electronic Publication: 2021 Jun 30.
DOI: 10.3390/polym13132188
Abstrakt: The kinetic regularities of the initial stage of chemical oxidative polymerization of methylene blue under the action of ammonium peroxodisulfate in an aqueous medium have been established by the method of potentiometry. It was shown that the methylene blue polymerization mechanism includes the stages of chain initiation and growth. It was found that the rate of the initial stage of the reaction obeys the kinetic equation of the first order with the activation energy 49 kJ × mol -1 . Based on the proposed mechanism of oxidative polymerization of methylene blue and the data of MALDI, EPR, and IR spectroscopy methods, the structure of the polymethylene blue chain is proposed. It has been shown that polymethylene blue has a metallic luster, and its electrical conductivity is probably the result of conjugation over extended chain sections and the formation of charge transfer complexes. It was found that polymethylene blue is resistant to heating up to a temperature of 440 K and then enters into exothermic transformations without significant weight loss. When the temperature rises above 480 K, polymethylene blue is subject to endothermic degradation and retains 75% of its mass up to 1000 K.
Competing Interests: The authors declare no conflict of interest.
Databáze: MEDLINE
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