Caprolactone modification of polyester resins / Nishant N. Prabhu in PAINTINDIA, Vol. LI, N° 10 (10/2001)

[article]  inPAINTINDIA > Vol. LI, N° 10 (10/2001) . - p. 43-48 Titre : Caprolactone modification of polyester resins Type de document : texte imprimé Auteurs : Nishant N. Prabhu, Auteur ; Deepak M. Bhatt, Auteur ; C. Suryanarayana, Auteur Année de publication : 2001 Article en page(s) : p. 43-48 Note générale : Bibliogr. Langues : Anglais (eng) Tags : Caprolactone  'Matériau  modifié'  'Modification  chimique'  'Ester  polymère'  Liant  Formulation  Peinture  revêtement' Index. décimale : 667.9 Revêtements et enduits Résumé : Three caprolactone modified polyesters with similar raw material compositions were synthesized by varying the mode of reaction of caprolactone so as to get one polyester with a caprolactone chain as the side chain and two polyesters with a caprolactone chain in the backbone. The viscosities of these polyesters and the properties of the film obtained by curing these polyesters with HMMM were compared. An unmodified polyester was synthesized and used as control resin. While caprolactone modification was found to give lower viscosity, the lowering of the viscosity was significant in case of polyesters with caprolactone in the backbone. Incorporation of caprolactone in the backbone can lower the pencil hardness of the film, but this problem can be overcome by first polymerizing caprolactone to form polycaprolactone and then reacting it in the backbore. Caprolactone in the backbone also improves the cupping value of the film. Note de contenu : - Experimental : Materials - Synthesis - Unmodified polyester (UP) - Modofied polyester 1 (MP1) - Modified polyester 2 (MP2) - Modified polyester 3 (MP3) - Analysis : Characterization of the polyester resins - Crosslinking and characterization of coating films Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12623 [article]

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Development of hyperbranched polyester polyol-based waterborne anticorrosive coating / Ashish Pratap Singh in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 13, N° 1 (01/2016)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 13, N° 1 (01/2016) . - p. 41-51 Titre : Development of hyperbranched polyester polyol-based waterborne anticorrosive coating Type de document : texte imprimé Auteurs : Ashish Pratap Singh, Auteur ; C. Suryanarayana, Auteur ; R. Baloji Naik, Auteur ; G. Gunasekaran, Auteur Année de publication : 2016 Article en page(s) : p. 41-51 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. Anticorrosion Métaux -- Revêtements protecteurs Polyesters Polymères ramifiés Polyols Revêtements -- Propriétés mécaniques:Peinture -- Propriétés mécaniques Revêtements en phase aqueuse:Peinture en phase aqueuse Index. décimale : 667.9 Revêtements et enduits Résumé : Water-soluble hydroxyl functionalized hyperbranched polyester (WH-HP) resin was synthesized using pentaerythritol, pyromellitic dianhydride, phthalic anhydride, and 1,1,1-tris(hydroxymethyl)propane. The synthesized WH-HP was characterized by spectroscopic (FTIR and NMR) as well as thermal (TGA and DSC) analysis. WH-HP and hexa methoxy methyl melamine (HMMM) resins were mixed in different mole ratios (1:2.5, 1:5, 1:7.5, and 1:10), coated on mild steel panel, and cured by baking at 110°C for 1 h. These coating compositions were evaluated for their mechanical and anticorrosive properties. It was observed that coating composition having 1:5 mol ratio (WH-HP:HMMM) has shown very good mechanical and anticorrosive properties compared to the rest. Note de contenu : - MATERIALS AND EXPERIMENTAL METHODS : Materials - Synthesis of polyester polyol (PP) - Synthesis of carboxyl-functionalized hyperbranched polyester (C-HP) - Synthesis of water-soluble hydroxyl-functionalized hyperbranched polyester resin (WH-HP) - Preparation of coating compositions - CHARACTERIZATION : Acid value - Characterization of resins - Gel content - Gel permeation chromatography (GPC) analysis - Particle size analysis - Resistance in corrosion under different exposure conditions - Electrochemical impedance spectroscopy (EIS) - RESULTS AND DISCUSSION : FTIR analysis - 1H and 13C NMR analysis - Thermal properties of films - Gel permeation chromatography (GPC) analysis - Gel content - Particle size distribution of WH-HP polymer - Mechanical properties - Solvent resistance - Anticorrosive properties DOI : 10.1007/s11998-015-9720-1 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-015-9720-1.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=25370 [article]

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Low molecular weight acrylic resins through change in the mode of initiator addition : a novel route of synthesis / Nishant N. Prabhu in PAINTINDIA, Vol. LIII, N° 8 (08/2003)

[article]  inPAINTINDIA > Vol. LIII, N° 8 (08/2003) . - p. 33-46 Titre : Low molecular weight acrylic resins through change in the mode of initiator addition : a novel route of synthesis Type de document : texte imprimé Auteurs : Nishant N. Prabhu, Auteur ; C. Suryanarayana, Auteur Année de publication : 2003 Article en page(s) : p. 33-46 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 667.9 Revêtements et enduits Résumé : High temperature processing, higher initiator dose, use of chain transfer agent and slower monomer addition are the commonly used techniques for getting low molecular weight acrylic resin in drip-feed process. An alternate route was evaluated wherein the initiator was added in the reactor either partly or completely prior to monomer addition. Nine different resins with same monomer compositions were synthesized, one resin as a control, four resins by using each of the above four routes for getting lower molecular weight than control and four by adding part or whole of the initiator in the reactor. The viscosity, percent solids, molecular weight distribution and free monomer content of these acrylic resins and the properties of the film obtained by curing these resins with an amino resin were compared. For initiator having higher half life at the processing temperature, the new route gave resin with lowest viscosity when all the initiator was added in the reactor. The performance of this resin was found comparable to the resins of similar molecular weight obtained by using the other available routes. The study showed that in case of initiator having lower half life at the processing temperature, optimization of ratio of splitting the initiator between reactor and initiator mix is required. Note de contenu : - Characterization of the acrylic resins – Paint processing and characterization – Crosslinking and characterization of coating films Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12161 [article]

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