Antiwetting and low-surface-energy behavior of cardanol-based polybenzoxazine-coated cotton fabrics for oil–water separation / P. Prabunathan in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 17, N° 6 (11/2020)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 17, N° 6 (11/2020) . - p. 1455-1469 Titre : Antiwetting and low-surface-energy behavior of cardanol-based polybenzoxazine-coated cotton fabrics for oil–water separation Type de document : texte imprimé Auteurs : P. Prabunathan, Auteur ; P. Elumalai, Auteur ; G. Dinesh Kumar, Auteur ; M. Manoj, Auteur ; A. Hariharan, Auteur ; G. Rathika, Auteur ; M. Alagar, Auteur Année de publication : 2020 Article en page(s) : p. 1455-1469 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse spectrale Angle de contact Caractérisation Cardanol Coton Le coton est une fibre végétale qui entoure les graines des cotonniers "véritables"(Gossypium sp.), un arbuste de la famille des Malvacées. Cette fibre est généralement transformée en fil qui est tissé pour fabriquer des tissus. Le coton est la plus importante des fibres naturelles produites dans le monde. Depuis le XIXe siècle, il constitue, grâce aux progrès de l'industrialisation et de l'agronomie, la première fibre textile du monde (près de la moitié de la consommation mondiale de fibres textiles). Eau Enduction textile Morphologie (matériaux) Polybenzoxazine Séparation (technologie) Séparation huile/eau Spectroscopie de photoélectrons Index. décimale : 667.9 Revêtements et enduits Résumé : In the present work, the surface behavior of cotton fabrics coated with a series of bio-based polybenzoxazines is explored. Herein, we report the design and synthesis of bio-based benzoxazine monomers (C-x) using cardanol (C) and seven different amines (x = ba, ha, dda, oda, ddm, jef, and fa). The molecular structures of the benzoxazine monomers have been confirmed using FTIR and NMR analyses. The microstructure of the polybenzoxazine-coated cotton fabrics observed from FE-SEM reveals that formation of rough nanostructure is influenced by molecular structure of monomers. Further, surface analysis shows that poly(C-dda)-coated cotton fabric offers superior water contact angle (WCA = 155° ± 3) with low sliding angle (6°). Also, poly(C-dda)-coated cotton fabric delivers the lowest surface energy (14.1 mN/m) and high resistance against acidic and alkaline media. Subsequently, oil–water separation investigation shows that the poly(C-dda)-coated cotton fabric yields 99% of separation efficiency with flux value of 7200 L/m2h. Thus, the cardanol-based polybenzoxazine-coated cotton fabrics prepared in the present work can find application in the field of oil–water separation due to their superior water-repellent nature. Note de contenu : - EXPERIMENTAL SECTION : Materials - Synthesis of cardanol-based benzoxazine monomers (C-x) - Preparation of benzoxazine-coated cotton fabrics - Characterization - Oil–water separation test - RESULTS AND DISCUSSION : Spectral analysis - Curing behavior of benzoxazine monomers - Spectral analysis of the coated fabrics - Surface properties - Morphology of the polybenzoxazine-coated cotton fabrics - XPS analysis - Oil–water separation DOI : https://doi.org/10.1007/s11998-020-00365-w En ligne : https://link.springer.com/content/pdf/10.1007/s11998-020-00365-w.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34952 [article]

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Corrosion resistance of siliconized-epoxy coatings / S. Ananda Kumar in EUROPEAN COATINGS JOURNAL (ECJ), N° 5/99 (05/1999)  

[article]  inEUROPEAN COATINGS JOURNAL (ECJ) > N° 5/99 (05/1999) . - p. 64-67 Titre : Corrosion resistance of siliconized-epoxy coatings Type de document : texte imprimé Auteurs : S. Ananda Kumar, Auteur ; M. Alagar, Auteur ; V. Mohan, Auteur Année de publication : 1999 Article en page(s) : p. 64-67 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 667.9 Revêtements et enduits Résumé : Though number of paint systems are available based on epoxy resin for submerged structures, they are not satisfactory from the view point of prevention of corrosion due to foulants. Hence, in the present investigation a new hybrid coating based on siliconised-epoxy interpenetrating polymeric networks have been developed and their corrosion resistant behaviour was studied by weight loss method. In the present study, the commercially available epoxy system GY 250 has been modified by siloxane grafting and the modified resin system is cured by two different curatives viz., aliphatic amine and polyamidoamine. The siliconized epoxy systems cured with aliphatic amine exhibit better corrosion protection due to high cross link density as well as better hydrophobic nature than the system cured with polyamidoamine. For example the epoxy grafted with 10% siloxane gives 98-99% corrosion protection to steel surface, whereas pure epoxy system gives only 80-92% corrosion protection under similar conditions of test. Further, the addition of zinc powder to the coating formulation enhances higher corrosion protection. Note de contenu : - Polymeric coatings play a vital role of surface protection techniques - Surface preparation of test specimen - Preparation of siliconozed-epoxy interpenetrating coating systems - Standardization of siloxane into epoxy system - Application of coating over test specimens - Calculation of weight loss - calculation of blank loss (X) - Maximum corrosion protection with siliconized-epoxy coating system filled with 25% of zinc powder - Siloxane improves the steel surface En ligne : https://drive.google.com/file/d/1nHJZgMzzrospxI0wttLYq1nhjjxH96wi/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11190 [article]

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Evaluation of siliconized epoxy coatings by electrochemical impedance spectroscopy / S. Ananda Kumar in EUROPEAN COATINGS JOURNAL (ECJ), N° 4/00 (04/2000)

[article]  inEUROPEAN COATINGS JOURNAL (ECJ) > N° 4/00 (04/2000) . - p. 64-77 Titre : Evaluation of siliconized epoxy coatings by electrochemical impedance spectroscopy Type de document : texte imprimé Auteurs : S. Ananda Kumar, Auteur ; M. Alagar, Auteur ; K. P. O. Mahesh, Auteur ; T. S. N. Sankara Narayanan, Auteur ; V. Mohan, Auteur Année de publication : 2000 Article en page(s) : p. 64-77 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 667.9 Revêtements et enduits Résumé : Solvent free siloxane modified epoxy coatings were developed by interpenetrating technique. The corrosion resistant behaviour of siliconized epoxy coating systems with 25% zinc powder cured with four different curatives has been investigated by Electrochemical Impedance Spectroscopy (EIS). The results are comparable with those obtained from neutral salt spray tests. The siloxane (10%) modified epoxy coating system A with 25% zinc powder cured by hexamethylene diamine offers maximum corrosion protection to steel surface. Note de contenu : - Preparation of siloxane modified epoxy coating system - Preparation of prepolymer mix - Siloxane introduction into epoxy coating system - Electrode preparation - Impedance measurements - Formation of a low frequency diffusion tail confirms that the corrosion process is a diffusion controlled reaction - The resistance and the capacitance values of coating systems A, B, C and D are in the range of 10^9 ohm.cm² and 10^-10 F - Better corrosion protection of steel surfaces - The Bode plot can be explained with the help of threshold frequency limits and the variation of logarithmic values of impedance with frequency - The data analysis of the coating systems A,B,C, and D confirms the existence of a single constant Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=10994 [article]

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Exploration of high corrosion resistance property of less hazardous pyrazolidine-based benzoxazines in comparison with bisphenol-F derivatives / M. Manoj in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 17, N° 4 (07/2020)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 17, N° 4 (07/2020) . - p. 921-935 Titre : Exploration of high corrosion resistance property of less hazardous pyrazolidine-based benzoxazines in comparison with bisphenol-F derivatives Type de document : texte imprimé Auteurs : M. Manoj, Auteur ; A. Kumaravel, Auteur ; R. Mangalam, Auteur ; P. Prabunathan, Auteur ; A. Hariharan, Auteur ; M. Alagar, Auteur Année de publication : 2020 Article en page(s) : p. 921-935 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. Analyse toxicologique Anticorrosion Caractérisation Métaux -- Revêtements protecteurs Polybenzoxazine Polymères -- Propriétés thermiques Pyrazolidine bisphénol Revêtements organiques Spectroscopie d'impédance électrochimique Index. décimale : 667.9 Revêtements et enduits Résumé : The present work describes the design of nontoxic pyrazolidine bisphenol (PYBP)-based hydrophobic benzoxazine (PBz) matrices, in comparison with that of bisphenol-F-based benzoxazines, and investigates their efficiency toward corrosion protection on mild steel surfaces. The preliminary in vitro toxicity assay studies infer the nontoxic nature of PYBP. Data obtained from thermal and surface studies indicate that the PYBP-based PBzs possess higher thermal stability than those of bisphenol-F benzoxazines. Observations from SEM images suggest that the inherent hydrophobic nature was due to the formation of rough surfaces. The corrosion studies of the specimens were carried out using open-circuit potential, electrochemical impedance spectroscopy, and potentiodynamic polarization. Among the mild steel specimens, coated with different benzoxazines, the poly(PYBP-oda)-coated specimen was found to be less aggressive toward corrosion showing 90% efficiency and charge transfer resistance (Rct) of 381 kΩ cm2. Thus, data obtained from different studies suggest that the PYBP-based benzoxazines can be used as a better coating material for steel and steel products against corrosion. Note de contenu : - EXPERIMENTAL : Chemicals - Synthesis of 1-(3,5-bis(4-hydroxyphenyl)-4, 5-dihydro-1H-pyrazol-1-yl)ethanone or pyrazolidine bisphenol (PYBP) - Preparation of pyrazolidine-bisphenol-based benzoxazine monomer (PYBP-dda, PYBP-oda, PYBP-fa) - - Synthesis of bisphenol-F-based benzoxazine monomer (BF-dda), BF-oda, BF-fa) - Preparation of benzoxazine-coated mild steel - Preparation of the coatings - Characterization - RESULTS AND DISCUSSION : Toxicity studies - Curing behavior of benzoxazines - Thermal behavior - Morphological properties of polybenzoxazines - Morphological properties of polybenzoxazine-coated mild steel - Electrochemical studies of the coated and uncoated mild steel specimens : open-circuit potential (Eocp) analysis - Polarization and electrochemical impedance studies of coated and uncoated mild steel specimens DOI : https://doi.org/10.1007/s11998-019-00312-4 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-019-00312-4.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34381 [article]

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Novel siliconized-epoxy interpenetrating coating / S. Ananda Kumar in EUROPEAN COATINGS JOURNAL (ECJ), N° 9/99 (09/1999)  

[article]  inEUROPEAN COATINGS JOURNAL (ECJ) > N° 9/99 (09/1999) . - p. 84-88 Titre : Novel siliconized-epoxy interpenetrating coating Type de document : texte imprimé Auteurs : S. Ananda Kumar, Auteur ; M. Alagar, Auteur ; K. P. O. Mahesh, Auteur ; V. Mohan, Auteur Année de publication : 1999 Article en page(s) : p. 84-88 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 667.9 Revêtements et enduits Résumé : Interpenetrating polymer networks (IPN) are novel types of polymer blends and they possess excellent physicochemical properties suitable for high performance coatings. In the present work a novel siliconized-epoxy coating system was developed by interpenetrating technique. The effect of siloxane introduction into epoxy resin and nature of curatives on the corrosion resistance characteristics towards steel specimen were studied by weight loss and electrochemical potential measurements. It was observed that, the siloxane incorporation enhances the corrosion resistant properties and reduce moisture absorption. It was also observed that the aromatic polyamineadduct cured siloxane modified epoxy coating system with 25% zinc powder exhibits better corrosion resistance than the polyamidoamine cured system. Note de contenu : - Status quo - Siloxane polymeric component is suitable to modify epoxy resin - Experimental: - Surface preparation of test specimen - Preparation of siloxane modified epoxy coating system - Preparation of prepolymer mix - Siloxane introduction into epoxy coating system - Application of coating over test specimen - Weight loss method - Calculation of weight loss a raw specimen (x) - Electrochemical potential measurement - Minimum weight loss and maximum corrosion protection with siloxane modified epoxy - Cured by aromatic polyamineadduct better than polyamidoamine cured system - Incorporation of siloxane as well as zinc powder enhances corrosion protection behaviour - Aromatic nature of the curative minimizes the oxidation of steel specimen En ligne : https://drive.google.com/file/d/1L6MR7jFmxogva2mCVG5UlfsNjV4Y4Pgb/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11208 [article]

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Siliconized epoxy : anticorrosive and antifouling paint / S. Ananda Kumar in EUROPEAN COATINGS JOURNAL (ECJ), N° 5/02 (05/2002)  

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Siliconized epoxy coatings / S. Ananda Kumar in EUROPEAN COATINGS JOURNAL (ECJ), N° 4/01 (04/2001)  

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The right mix / A. Anand Prabu in EUROPEAN COATINGS JOURNAL (ECJ), N° 1-2/2004 (01-02/2004)  

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