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Effect of pendant functional groups on curing kinetics and final properties of cardanol-based benzoxazines / Kunal Wazarkar in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 15, N° 3 (05/2018)
[article]
Titre : Effect of pendant functional groups on curing kinetics and final properties of cardanol-based benzoxazines Type de document : texte imprimé Auteurs : Kunal Wazarkar, Auteur ; Anagha Sabnis, Auteur Année de publication : 2018 Article en page(s) : p. 555-569 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse spectrale
Analyse thermique
Benzoxazine
Cardanol
Cinétique chimique
Composés organiques -- Synthèse
Polymérisation
RevêtementsIndex. décimale : 667.9 Revêtements et enduits Résumé : The present study reveals the effect of pendant functional groups on curing and final properties of cardanol-derived benzoxazines. Three benzoxazines are synthesized by choosing three functional amines, namely aniline, 4-aminophenol, and 4-aminobenzoic acid. The structure of the benzoxazines is confirmed by chemical as well as spectroscopic analysis. Curing kinetics of benzoxazines is studied using nonisothermal differential scanning calorimetry (DSC) at four different heating rates: 5, 10, 15, and 20 degrees per minute. Further, kinetic models of Kissinger and Flynn–Wall–Ozawa are applied to determine the kinetic parameters of the curing reaction. Curing kinetics and modeling studies reveal that benzoxazine containing phenolic OH requires lower energy of activation for curing as compared to carboxyl functional benzoxazine and neat benzoxazine. Moreover, coatings are applied on mild steel (MS) panels and evaluated for mechanical, chemical, and thermal properties. Note de contenu : - MATERIALS
- EXPERIMENTAL : Synthesis of benzoxazines - Panel preparation - Coating application
- INSTRUMENTATION
- CHARACTERIZATION
- RESULTS AND DISCUSSIONS : FTIR spectroscopy - H-NMR spectroscopy - Gel permeation chromatography - Curing kinetics by nonisothermal DSC analysis - Mechanism of curing - Coating propertiesDOI : 10.1007/s11998-017-0020-9 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-017-0020-9.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30752
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 15, N° 3 (05/2018) . - p. 555-569[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 20024 - Périodique Bibliothèque principale Documentaires Disponible Sustainable cardanol-based multifunctional carboxyl curing agents for epoxy coatings: Si–S synergism / Kunal Wazarkar in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 17, N° 5 (09/2020)
[article]
Titre : Sustainable cardanol-based multifunctional carboxyl curing agents for epoxy coatings: Si–S synergism Type de document : texte imprimé Auteurs : Kunal Wazarkar, Auteur ; Anagha Sabnis, Auteur Année de publication : 2020 Article en page(s) : p. 1217–1230 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Anticorrosifs
Anticorrosion
Caractérisation
Cardanol
Composés inorganiques -- Synthèse
Epoxydes
Formulation (Génie chimique)
Hydrophobie
Réticulants
Revêtements organiques
Silicium
SynergieIndex. décimale : 667.9 Revêtements et enduits Résumé : High-performance epoxy coatings were prepared by crosslinking commercial diglycidyl ether of bisphenol-A with silicon–sulfur containing di- and tetra-functional carboxyl curing agents based on cardanol. The curing agents were synthesized and products were analyzed by chemical, spectroscopic, and chromatographic techniques. In the next part, coatings were formulated by varying the ratio of epoxy resin to curing agents on equivalent basis, such as 1:0.6, 1:0.8, and 1:1. The coatings were applied on mild steel panels and cured at 150°C for 30 min. The resultant coatings were evaluated for performance properties including mechanical, chemical, optical, thermal anticorrosive, and flame retardant properties. It was observed that with an increase in concentration of silicon–sulfur containing curing agents, water contact angles of the coatings substantially increased. Moreover, electrochemical impedance spectroscopy, Tafel analysis, and salt spray studies revealed that anticorrosive properties of the coatings improved with an increase in concentration of silicon and sulfur. In spite of synergistic effect of silicon–sulfur, only marginal improvement in flame retardant properties was observed. Note de contenu : - EXPERIMENTAL : Synthesis of silicon containing dimer of cardanol (SIL) - Synthesis of Si–S containing multifunctional carboxyl curing agents - Formulation of coatings - Characterization - Instrumentation
- RESULTS AND DICUSSION : FTIR spectroscopy - 1H-NMR spectroscopy - Gel permeation chromatography - Coating propertiesDOI : https://doi.org/10.1007/s11998-020-00341-4 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-020-00341-4.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34568
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Code-barres Cote Support Localisation Section Disponibilité 22303 - Périodique Bibliothèque principale Documentaires Disponible UV-curable flame-retardant coatings based on phosphorous and silicon containing oligomers / Durva Naik in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 3 (05/2019)
[article]
Titre : UV-curable flame-retardant coatings based on phosphorous and silicon containing oligomers Type de document : texte imprimé Auteurs : Durva Naik, Auteur ; Kunal Wazarkar, Auteur ; Anagha Sabnis, Auteur Année de publication : 2019 Article en page(s) : p. 733-743 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Bois -- Revêtements protecteurs
Epoxydes
IgnifugeantsComposé chimique utilisé pour réduire l'inflammabilité. Il peut être incorporé au produit durant sa fabrication ou appliqué ultérieurement à sa surface.
Phosphore
Revêtements -- Séchage sous rayonnement ultraviolet
SiliconesLes 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).
SynergieIndex. décimale : 667.9 Revêtements et enduits Résumé : Current research on flame-retardant coatings explores alternatives to halogen-based products. Reactive compounds based on phosphorous and silicon were synthesized and cooperated in epoxy acrylate oligomers to form UV-curable flame-retardant wood coatings. FTIR, 1H NMR, hydroxyl and iodine values confirmed successful synthesis of these products. The effect of the varying proportion of the synthesized compounds on the mechanical, chemical and thermal properties of photopolymerized coatings was investigated. Further, the efficacy of flame retardants was estimated by limiting oxygen index and UL-94 vertical burning test. The synergistic behavior between silicon and phosphorous resulted in an optimum formulation giving an LOI of 24 and VTM-0. Note de contenu : - MATERIALS AND METHODS : Raw materials and chemicals - Synthesis of PGBPA - Synthesis of Si-HEA - Preparation of UV-curable wood coatings - Characterization - Instrumentation
- RESULTS AND DISCUSSION : FTIR analysis - H NMR anlaysis of PGPBA - Coating propertiesDOI : 10.1007/s11998-018-0151-7 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-018-0151-7.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32586
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Code-barres Cote Support Localisation Section Disponibilité 20953 - Périodique Bibliothèque principale Documentaires Disponible