Corrosion protection of benzoxazine and cardanol-doped polyaniline coatings / Raiane Valenti Gonçalves in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 2 (03/2022)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 2 (03/2022) . - p. 575-586 Titre : Corrosion protection of benzoxazine and cardanol-doped polyaniline coatings Type de document : texte imprimé Auteurs : Raiane Valenti Gonçalves, Auteur ; Isadora Quinhones Liposki, Auteur ; Lucas Weber Dias, Auteur ; Alessandra Fiorini Baldissera, Auteur ; Mauro Ricardo da Silva Silveira, Auteur ; Carlos Arthur Ferreira, Auteur ; Leila Bonnaud, Auteur ; Nara Regina de Souza Basso, Auteur Année de publication : 2022 Article en page(s) : p. 575-586 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Anticorrosifs Anticorrosion Benzoxazine Caractérisation Cardanol Essais d'adhésion Formulation (Génie chimique) Polyacrylonitrile Polymères -- Synthèse Revêtements organiques Revêtements protecteurs Spectroscopie d'impédance électrochimique Index. décimale : 667.9 Revêtements et enduits Résumé : In this work a corrosion protection material formed by commercial benzoxazine and polyaniline (PAni) for coatings applications was developed. PAni doped with a natural phenolic compound, cardanol, was used in the coating preparation, and conventional hydrochloric acid-doped PAni was also used for comparative purposes. Cardanol is a reddish-brown liquid obtained from the by-product of cashew nut processing. The presence of the aliphatic group and the hydroxyl of the cardanol, as well as the amine groups of the PAni, can enhance the corrosion barrier of a benzoxazine coatings. The anticorrosive properties of the coatings were evaluated by electrochemical impedance spectroscopy in 3.5% NaCl solution for a total period of 168 h. The coatings of benzoxazine filled with PAni showed better anticorrosion performance and adhesion strength on carbon steel substrate when compared to pristine benzoxazine and PAni doped with 3 wt% cardanol exhibits the best performances. This last result can be explained by both the presence of PAni and the better PAni dispersion within benzoxazine when doped with cardanol. In addition, the incorporation of cardanol-doped PAni in the benzoxazine reduced the cure temperature of the benzoxazine. Note de contenu : - EXPERIMENTAL : Materials - Synthesis of cardanol-doped polyaniline - Benzoxazine/PAni coatings preparation - Characterization - RESULTS AND DISCUSSION : Benzoxazine/Jeffamine® ED 600 curing systems - Benzoxazine/PAni coatings characterizations - Anticorrosive performance of benzoxazine/PAni coatings - Adhesion strength test - Table 1 Formulation of benzoxazine /PAni coatings - Table 2 Data of TGA curves of pure Bz and Bz - Table 3 Data of DSC associated with curing process of benzoxazines coatings - Table 4 Coating’s values of average thickness and adhesion strength DOI : https://doi.org/10.1007/s11998-021-00545-2 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00545-2.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37288 [article]

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The effect of rue (Ruta graveolens) and ginger (Zingiber officinale) extracts as antifouling agents in silicone matrix coatings / Ariane V. Zmozinski in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 4 (07/2021)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 18, N° 4 (07/2021) . - p. 1013-1025 Titre : The effect of rue (Ruta graveolens) and ginger (Zingiber officinale) extracts as antifouling agents in silicone matrix coatings Type de document : texte imprimé Auteurs : Ariane V. Zmozinski, Auteur ; Rafael S. Peres, Auteur ; Flávia Roberta Brust, Auteur ; Alexandre José Macedo, Auteur ; Emilene Mendes Becker, Auteur ; Amanda Pasinato Napp, Auteur ; Henrique Alves de Brito, Auteur ; Marilene H. Vainstein, Auteur ; Augusto Schrank, Auteur ; Carlos Arthur Ferreira, Auteur Année de publication : 2021 Article en page(s) : p. 1013-1025 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse électrochimique Caractérisation Essais (technologie) Extraits de plantes Gingembre et constituants Oléorésines Revêtements antisalissures:Peinture antisalissures Revêtements organiques Rue (plante) et constituants Silicones Les silicones, ou polysiloxanes, sont des composés inorganiques formés d'une chaine silicium-oxygène (...-Si-O-Si-O-Si-O-...) sur laquelle des groupes se fixent, sur les atomes de silicium. Certains groupes organiques peuvent être utilisés pour relier entre elles plusieurs de ces chaines (...-Si-O-...). Le type le plus courant est le poly(diméthylsiloxane) linéaire ou PDMS. Le second groupe en importance de matériaux en silicone est celui des résines de silicone, formées par des oligosiloxanes ramifiés ou en forme de cage (wiki). Index. décimale : 667.9 Revêtements et enduits Résumé : The use of rue extract and ginger oleoresin as natural antifouling agents in a silicone matrix was verified in this work. 13C nuclear magnetic resonance (13C NMR) analysis identified a series of compounds with bactericidal properties in the two investigated natural products. Thermogravimetric analyses showed that the addition of rue extract and ginger oleoresin in the silicone matrix increased the thermal stability of the formed films. Electrochemical impedance spectroscopy analysis showed that the presence of both antifouling agents increases the velocity of water diffusion into the film, improving contact between marine water and the two products. Fourier transform infrared spectroscopy confirms that both antifouling agents were trapped inside the silicone matrix. Bacterial adhesion tests showed that rue extract reduced the adhesion of gram-negative bacteria, Escherichia coli, while ginger oleoresin did not show any significant effect. Optical microscopy images demonstrated that the presence of rue extract slightly increased the film’s porosity without impairing the silicone hydrophobicity, while ginger oleoresin significantly altered the film's morphology (reducing the water contact angle). Finally, the sample containing rue extract showed excellent results against marine fouling after 6 months of immersion in a real marine environment. The polymer containing ginger oleoresin showed satisfactory results against marine fouling ; however, the film showed adhesion failures after 6 months. Note de contenu : - EXPERIMENTAL : Materials - Preparation of rue extract - Preparation of silicone coatings - Marine fouling tests - Electrochemical tests - In vitro bacterial adhesion test - Characterization - RESULTS AND DISCUSSION : Chemical characterization - TGA - Electrochemical analysis - Surface characterization - Bacterial adhesion - Antifouling tests - Table 1 : Samples composition - Table 2 : TGA and DTG data from the RUTA and GEN samples - Table 3 : Transport parameters obtained for blank, GEN, and RUTA samples DOI : https://doi.org/10.1007/s11998-021-00454-w En ligne : https://link.springer.com/content/pdf/10.1007/s11998-020-00454-w.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36209 [article]

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