Corrosion performance of chemically synthesized poly(aniline-co-o-toluidine) copolymer coating on mild steel / M. Mobin in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 9, N° 1 (01/2012)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 9, N° 1 (01/2012) . - p. 27-38 Titre : Corrosion performance of chemically synthesized poly(aniline-co-o-toluidine) copolymer coating on mild steel Type de document : texte imprimé Auteurs : M. Mobin, Auteur ; N. Tanveer, Auteur Année de publication : 2012 Article en page(s) : p. 27-38 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Acier L'acier est un alliage métallique utilisé dans les domaines de la construction métallique et de la construction mécanique. L'acier est constitué d'au moins deux éléments, le fer, très majoritaire, et le carbone, dans des proportions comprises entre 0,02 % et 2 % en masse1. C'est essentiellement la teneur en carbone qui confère à l'alliage les propriétés du métal qu'on appelle "acier". Il existe d’autres métaux à base de fer qui ne sont pas des aciers comme les fontes et les ferronickels par exemple. Copolymères Copolymérisation Oxydation Polyaniline Test d'immersion Toluidine Index. décimale : 667.9 Revêtements et enduits Résumé : A soluble copolymer from aniline and o-toluidine [poly(aniline-co-o-toluidine)] was synthesized by chemical oxidative copolymerization using ammonium persulphate as an oxidant in hydrochloride aqueous medium. The resultant copolymer was characterized by Fourier Transform Infrared (FTIR) spectroscopy and chemically deposited on mild steel specimens using N-methyl-2-pyrrolidone (NMP) as solvent via solution evaporation method. The anticorrosive properties of copolymer coating was investigated in major corrosive environments, such as 0.1 M HCl, 5% NaCl solution, artificial seawater, distilled water and open atmosphere by conducting various corrosion tests which include: immersion test, open circuit potential (OCP) measurements, potentiodynamic polarization measurements and atmospheric exposure test. The corrosion performance of copolymer coating was also compared separately with polyaniline (PANi) and poly(o-toluidine) (POT) homopolymer coatings. The surface morphologies of polymer coatings were evaluated using scanning electron microscopy (SEM). The synthesized copolymer exhibited excellent protection against mild steel corrosion; the protection efficiency being in the range of 78–94% after 30 days of immersion. The corrosion performance of copolymer in 5% NaCl and artificial seawater was comparable, which was only marginally better than in 0.1 M HCl. In general, the performance of copolymer coating was found to be better than that of homopolymer coatings. Note de contenu : - EXPERIMENTAL : Preparation of specimen - Synthesis and characterization of poly(aniline-coo-toluidine), polyaniline, and poly(o-toluidine) - Preparation of poly(aniline-co-o-toluidine), polyaniline, and poly(o-toluidine) coatings on mild steel - Corrosion performance of the poly(aniline-co-o-toluidine), polyaniline, and poly(o-toluidine) coatings - Immersion test - Free corrosion potential measurements - Potentiodynamic polarization measurements - Atmospheric test - RESULTS AND DISCUSSION : FTIR spectra of poly(aniline-co-o-toluidine), polyaniline, and poly(o-toluidine) - Immersion test - Open circuit potential measurements - Potentiodynamic polarization measurements - Atmospheric test DOI : 10.1007/s11998-011-9328-z En ligne : https://link.springer.com/content/pdf/10.1007/s11998-011-9328-z.pdf?pdf=button Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=14352 [article]

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On the NH and CH acidities of toluidine isomers : theoretical description and practical consequences for the synthesis of certain aniline dyes / Vladimir Lukes in COLORATION TECHNOLOGY, Vol. 137, N° 4 (12/07/2021)  

[article]  inCOLORATION TECHNOLOGY > Vol. 137, N° 4 (12/07/2021) . - p. 389-398 Titre : On the NH and CH acidities of toluidine isomers : theoretical description and practical consequences for the synthesis of certain aniline dyes Type de document : texte imprimé Auteurs : Vladimir Lukes, Auteur ; Horst Hartmann, Auteur Année de publication : 2021 Article en page(s) : p. 389-398 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Acides et bases, Théories des Aniline Colorants Oxydation Toluidine Index. décimale : 667.2 Colorants et pigments Résumé : For the toluidine isomers, amino group acidity represents a characteristic feature of these compounds in their electric neutral state. As demonstrated by theoretical calculations based on the quantum chemistry composite G4 method and density functional theory, the CH acidity of the methyl group is hidden under NH acidity. The transformation of toluidines into their mono- and bi-oxidised states significantly increases the acidity of the methyl group. This study indicates that the presence or absence of these deprotonated species in reaction mixtures will determine the CN or CC coupling toluidine products. In agreement with published synthetic approaches for aniline dyes, such as mauveine and fuchsine, the results obtained explain the alternative reaction pathways occurring during the oxidation of toluidine isomers. Note de contenu : - COMUTATIONAL METHODOLOGY - RESULTS AND DISCUSSION : Thermodynamics of the toluidine acid-base reaction - Theoretical pKa values of toluidine oxidation states - Oxidation states and the reactivity of toluidine - Table 1 : Reaction G4 Gibbs free energies for selected acid-basic steps (energies in kJ mol-1) - Table 2 : The predicted pKa values from the isodesmic reaction and G4 (integral equation formalism-polarisable continuum model) calculations DOI : https://doi.org/10.1111/cote.12536 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12536 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36103 [article]

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