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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
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Code-barres Cote Support Localisation Section Disponibilité 20024 - Périodique Bibliothèque principale Documentaires Disponible Glycolytic depolymerization of PET waste using MP-diol and utilization of recycled product for UV-curable wood coating / Vandana Jamdar in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 15, N° 2 (03/2018)
[article]
Titre : Glycolytic depolymerization of PET waste using MP-diol and utilization of recycled product for UV-curable wood coating Type de document : texte imprimé Auteurs : Vandana Jamdar, Auteur ; Mukesh Kathalewar, Auteur ; Anagha Sabnis, Auteur Année de publication : 2018 Article en page(s) : p. 259-270 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Bois -- Revêtements
Bouteilles en matières plastiques -- Recyclage
GlycolyseLa glycolyse ou voie d'Embden-Meyerhof-Parnas est une voie métabolique d'assimilation du glucose et de production d'énergie. Elle se déroule dans le hyaloplasme (ou cytosol) de la cellule. Comme son nom l'indique elle nécessite du glucose et a pour produit du pyruvate. Ce dernier peut soit entrer dans le cycle de Krebs, qui se déroule dans la mitochondrie des eucaryotes ou le cytoplasme des bactéries en aérobiose, soit être métabolisé par fermentation en anaérobiose, pour produire par exemple du lactate ou de l'éthanol.
Matières plastiques -- Recyclage
Oligomères
Polyéthylène téréphtalate
Polymères -- Détérioration
Polymères -- Synthèse
Revêtements -- Séchage sous rayonnement ultravioletIndex. décimale : 667.9 Revêtements et enduits Résumé : Polyethylene terephthalate (PET) waste recycling has become a worldwide research interest for industries and academic institutes due its inevitable environmental impact. The main objective of current research work is to target efficient recycling of PET waste from mineral water bottles by the glycolysis method and subsequent use of the recycled product for value-added coating application. In the present study, we report on MP-diol (2-methyl-1,3-propanediol) which is not explored much for the chemical recycling of PET, having a branched aliphatic diol with two primary hydroxyls, for glycolysis reaction. The reaction parameters were optimized for microwave-assisted technique by varying the ratio of raw materials, reaction time, temperature, and power. The reaction parameters were optimized, and the recycled oligomeric product (OPETMPD) was separated, purified, and characterized by chemical and spectroscopic methods. Subsequently, dimethacrylated oligoesters of PET oligomer (UV oligomer) were synthesized by methacrylation of the glycolyzed PET product (OPETMPD). The synthesized UV oligomer was evaluated using chemical and spectroscopic methods. Ultraviolet (UV) radiation-curable formulations were prepared using synthesized UV oligomer and applied on wooden panels. The coatings were cured using UV-curing machine and evaluated for their performance properties. The partial replacement of UV oligomer in UV formulations exhibited comparative coating performance properties with respect to conventional UV formulation. Note de contenu : - EXPERIMENTAL : Materials - Depolymerization of PET waste using MP-diol by microwave technique - Methacrylation of recycled oligomeric product (UV oligomer) - Formulations of UV-curable wood coatings - Characterization - Instrumentation
- RESULTS AND DISCUSSION : Depolymerization of PET using MP-diol (OPETMPD) - Synthesis and characterization of UV oligomer - UV-curing formulationsDOI : 10.1007/s11998-017-9992-8 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-017-9992-8.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30278
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Code-barres Cote Support Localisation Section Disponibilité 19742 - 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