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Use of dielectric spectroscopy for real-time in-situ reaction monitoring / Steven H. Nahm in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 3, N° 4 (10/2006)
[article]
Titre : Use of dielectric spectroscopy for real-time in-situ reaction monitoring Type de document : texte imprimé Auteurs : Steven H. Nahm, Auteur Année de publication : 2006 Article en page(s) : p. 257-265 Note générale : Bibliogr. Langues : Américain (ame) Tags : 'Méthode diélectrique' Cinétique Polyaddition Monomère Fonctionnalisation 'Addition de Michaël' 'Modification chimique' Prépolymère Polyuréthane Oligomère Polyacrylate Revêtement Monitorage Index. décimale : 667.9 Revêtements et enduits Résumé : Coating resin manufacturing requires knowledge of the extent of reaction during resin synthesis so the appropriate actions can be taken (addition of the next reactant, reaction termination, etc.). This article reports the results from experiments conducted to survey.the utility of dielectric spectroscopy (DES) as a real-time, in-situ technique to monitor the extent of reaction during synthesis of three low molecular weight resins that are representative of components used in coatings formulations. The resins made were based on very different chemistries: (1) a 100% solids polyacrylate functional oligomer from the Michael reaction between a polyacrylate monomer and an acetoacetate ester; (2) an acrylate functional monomer from the reaction between an epoxy ester and acrylic acid; and (3) a solvent-based isocyanate-terminated polyurethane prepolymer from the reaction between a mixture of diols and excess diisocyanate. In all three cases, very good to excellent correlations were found between continuous real-time DES output and the values of characteristic QC parameters (viscosity, acid number, epoxy equivalent weight, % NCO, ATR-FTIR peak heights for reactants and products, and GPC data) determined by off-line analysis of samples taken periodically during the reactions. DOI : 10.1007/s11998-006-0021-6 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-006-0021-6.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3678
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 3, N° 4 (10/2006) . - p. 257-265[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 005756 - Périodique Bibliothèque principale Documentaires Disponible High-performance UV-cured composite and nanocomposite materials / Khalid Zahouily in JEC COMPOSITES MAGAZINE, N° 32 (05/2007)
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Titre : High-performance UV-cured composite and nanocomposite materials Type de document : texte imprimé Auteurs : Khalid Zahouily, Auteur ; C. Decker, Auteur Année de publication : 2007 Article en page(s) : p. 75-79 Langues : Anglais (eng) Tags : 'Fibre minérale' 'Etude expérimentale' 'Propriété mécanique' rhéologique' 'Relation mise en oeuvre propriété' Cinétique 'Polymérisation masse' ouverture cycle' cationique' 'Composé polyfonctionnel' photochimique' Préparation 'Matériau renforcé dispersion' fibre' 'Polymère réticulé' Polyacrylate Argile verre' 'Glycidyle éther polymère' Nanocomposite composite' Index. décimale : 668.4 Plastiques, vinyles Résumé : Composite materials made of either epoxy resin reinforced with glass fibre or clay/ acrylate resin have been produced rapidly at ambient temperature by simple exposure to UV radiation. This UV-curing technology clearly outperforms traditional thermal processing with respect to output, cost, product quality and environmental impact. Note de contenu : - UV-radiation curing technology
- Different types of UV-curable resins
- Photoinitiated radical polymerization
- Photoinitiated cationic polymerisation
- Kinetic study of photoinitiated polymerisation reactions by real-time infrared spectroscopy
- Features and advantages of on-line UV manufacturing
- Outstanding characteristics
- Nanocomposite materialsPermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=14200
in JEC COMPOSITES MAGAZINE > N° 32 (05/2007) . - p. 75-79[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 007184 - Périodique Bibliothèque principale Documentaires Disponible