An A2 + CB2 approach to the synthesis of hyperbranched polyester polyol and application in PU coatings / Amardip M. Patil in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 21, N° 3 (05/2024)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 21, N° 3 (05/2024) . - p. 1085-1095 Titre : An A2 + CB2 approach to the synthesis of hyperbranched polyester polyol and application in PU coatings Type de document : texte imprimé Auteurs : Amardip M. Patil, Auteur ; Dhammanand J. Shirale, Auteur ; Harishchandra D. Jirimali, Auteur ; Ramanand N. Jagtap, Auteur Année de publication : 2024 Article en page(s) : p. 1085-1095 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse morphologique Caractérisation Enrobage (technologie) Polymères -- Synthèse Polymères ramifiés Polyuréthanes Résistance chimique Revêtements -- Analyse Revêtements organiques Stabilité thermique Surfaces -- Analyse Index. décimale : 667.9 Revêtements et enduits Résumé : In the present work, neopentyl glycol was used as a core for the synthesis of hyperbranched polymer by melt condensation polymerization with 2,2-Bis(hydroxymethyl) propionic acid. The A2 + CB2 synthetic method was used where neopentyl glycol was A2 and 2,2-Bis(hydroxymethyl) propionic acid was CB2. The acid value and hydroxyl values of the synthesized hyperbranched polymer were determined according to ASTM D974 and ASTM D4274, respectively. The molecular structural characterizations of hyperbranched polyol were determined by FTIR and NMR spectroscopy techniques. The hyperbranched polyurethanes were synthesized by using hyperbranched polyol and crosslinking agent isophorone diisocyanate in different mole ratios of OH:NCO (1:1.2, 1:1.4, 1:1.6). These mixtures were used as coating materials on mild steel panels and glass plates. The coating properties of polyurethanes such as gloss and cross-cut adhesion were studied. The immersion test of coatings was carried out in HCl, NaCl, NaOH and water. The electrochemical properties of the coatings were examined using an electrochemical method in electrolytes consisting of HCl, NaOH, and NaCl. Thermal stability and surface morphology were studied by TGA and SEM, respectively. Note de contenu : - EXPERIMENTAL SECTION : Materials - Synthesis of hyperbranched polyester polyol (HBP) from neopentyl glycol (NG) - Preparation of hyperbranched polyurethane (HBPU) - Characterizations - Functional group analysis - Structural study - Coating properties - Chemical resistance - Electrochemical study - Thermogravimetric study - Study of scanning electron microscopy images - RESULTS AND DISCUSSION : Study of FTIR and NMR spectra - Coating properties - Chemical resistance - Electrochemical study of the HBPU coatings - Thermogravimetric analysis of HBPU - Study of scanning electron microscopy images DOI : https://doi.org/10.1007/s11998-023-00875-3 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-023-00875-3.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=41078 [article]

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PU-coating performance of bio-based hyperbranched alkyd resin on mild steel and wood substrate / Amardip M. Patil in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 3 (05/2021)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 18, N° 3 (05/2021) . - p. 741-752 Titre : PU-coating performance of bio-based hyperbranched alkyd resin on mild steel and wood substrate Type de document : texte imprimé Auteurs : Amardip M. Patil, Auteur ; Ramanand N. Jagtap, Auteur Année de publication : 2021 Article en page(s) : p. 741-752 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Amides Biopolymères Bois -- Revêtements protecteurs Caractérisation Enrobage (technologie) Essais (technologie) Essais de résilience Essais dynamiques Huile de ricin et constituants Métaux -- Revêtements protecteurs Polyalkydes Polymères ramifiés Polyols Polyuréthanes Index. décimale : 667.9 Revêtements et enduits Résumé : In the present research article, a hyperbranched alkyd resin was synthesized by using bio-based material (castor oil based fatty amide) and pyromellitic dianhydride. The synthesized hyperbranched alkyd resin was characterized by nuclear magnetic resonance (NMR) and Fourier transform infrared (FTIR) spectroscopy. The polyurethanes (PMFAI and PMFAM) were prepared from hyperbranched alkyd resin and diisocyanates [isophorone diisocyanates (IPDI) and methylene diphenyl diisocyanate (MDI)] maintaining the OH:NCO ratio of 1:1.2. These polyurethanes were used in coating applications on mild steel and wood panels. The performance of cured polyurethane coatings was studied in terms of crosscut adhesion, impact resistance, gloss, scratch hardness, and chemical resistance. The chemical resistance test was performed by immersion method in 2 N HCl, 2 N NaOH, 3.5% NaCl solution, xylene, and water. The corrosion rate and anticorrosion efficiency of the coating panels were determined by a potentiostat. From a study of coating properties, it was found that the PMFAI and PMFAM exhibited better coating properties as compared to reported linear alkyd polyurethanes. The stain test of coatings was performed on wood panels. The thermal behavior of the coatings was determined by thermogravimetric analyzer. The surface morphology of coating films was examined by scanning electron microscopy and atomic force microscopy. It was found that the coating properties of hyperbranched alkyd resin were excellent as compared to linear alkyd resin polyurethanes. Note de contenu : - MATERIALS - EXPERIMENTAL : Synthesis of fatty amide from castor oil - Synthesis of hyperbranched alkyd resin - Preparation of mild steel panel and wood panels - Preparation of polyurethane coatings from alkyd resin - Characterization - Coating properties - RESULTS AND DISCUSSION : Acid and hydroxyl values analysis - FTIR and NMR study - Coating properties - Stain test - Immersion tests - Electrochemical study - Thermal study - Surface morphology of coatings - Table 1 Coating performance of coated mild steel panels - Table 2 Stain test of coatings on wood - Table 3 Immersion test of coatings - Table 4 Electrochemical properties of coatings - Table 5 Thermal properties of coatings DOI : https://doi.org/10.1007/s11998-020-00438-w En ligne : https://link.springer.com/content/pdf/10.1007/s11998-020-00438-w.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35926 [article]

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