Interfacial oxidative polymerization of aniline on silica gel's surface

Kinetics of the oxidative polymerization of aniline in toluene induced by manganese (IV) oxide deposited on the surface of silica gel was studied using ESR spectroscopy. The initial rate of an interfacial process decreases rapidly, and then polymerization proceeds as pseudo-first order reaction for...

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Bibliographic Details
Published in:Polymer (Guilford) 2020-08, Vol.203, p.122808, Article 122808
Main Authors: Mezhuev, Y.O., Motyakin, M.V., Plyushchii, I.V., Alekperov, R.A., Luss, A.L., Kovarskii, A.L., Degtyarev, Ye.N., Ionova, I.S., Dyatlov, V.A., Vorobev, I. Yu, Vagramyan, T.A., Abrashov, A.A., Tsatsakis, A.M., Shtilman, M.I., Korshak, Yu.V.
Format: Article
Language:English
Subjects:
Activation energy
Aniline
Diffusion rate
Interfacial polymerization
Manganese
Oxidative polymerization
Polyaniline
Polyanilines
Polymerization
Reaction kinetics
Silica
Silica gel
Silicon dioxide
Spectroscopy
Surface kinetics
Toluene
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Summary:Kinetics of the oxidative polymerization of aniline in toluene induced by manganese (IV) oxide deposited on the surface of silica gel was studied using ESR spectroscopy. The initial rate of an interfacial process decreases rapidly, and then polymerization proceeds as pseudo-first order reaction for the surface concentration of manganese (IV) oxide with an activation energy of 23 kJ × mol−1. A low activation energy indicates that the overall rate is controlled by aniline diffusion into the reaction zone. The specific surfaces and the distribution of pore volume by radii of the silica gel samples before and after the deposition of manganese (IV) oxide on its surface, as well as after oxidative polymerization of aniline were determined. Oxidative polymerization of aniline causes a shift in the pore volume distribution along the radii to the region of larger pore radii, which indicates the predominant filling of pores of small diameter with polyaniline. [Display omitted] •Oxidative polymerization of aniline on silica gel surface was performed.•The rate of aniline polymerization decreases rapidly at the reaction start.•Aniline polymerization occurs as an interfacial process with E = 23 kJ × mol−1.•The reaction rate is limited by the diffusion of aniline into the reaction zone.•The specific surface of MnO2/silica gel increases after the polymerization of aniline.
ISSN:0032-3861
1873-2291
DOI:10.1016/j.polymer.2020.122808