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Synthesis and characterisation of benzothiazole-based solid-state fluorescent azo dyes / Ganapati S. Shankarling in COLORATION TECHNOLOGY, Vol. 126, N° 6 (2010)
[article]
Titre : Synthesis and characterisation of benzothiazole-based solid-state fluorescent azo dyes Type de document : texte imprimé Auteurs : Ganapati S. Shankarling, Auteur ; Rajkumar N. Rajule, Auteur ; Yogesh A. Sonawane, Auteur ; Prakhar P. Kasture, Auteur Année de publication : 2010 Article en page(s) : p. 348-352 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Benzothiazoles
Caractérisation
Chimie analytique
Chimie textile
Colorants
Colorants -- Synthèse
Fibres polyesters
Solubilité
Solvants organiques
Teinture -- Fibres textilesTags : 'Teintures azotées fluorescentes à semi-conducteur' 'Solvant organique' Colorant Caractérisation Solubilité 'Coefficient d'extinction molaire' Dichlorométhane Chloroforme Diméthylformamide Tétrahydrofurane 'Sulfoxyde diméthylique' Polyester 'Teinture de dispersion' Thermogravimétrie 'Résonance magnétique proton' 'Spectrométrie masse' Stabilité thermique Index. décimale : 667.3 Teinture et impression des tissus Résumé : Novel solid-state fluorescent azo dyes containing a 2-[4-(dimethylamino)phenyl]benzo[d]thiazol-6-amine as the electron donor group were synthesised. These dyes showed a molar extinction coefficient in the range of 20 000–30 000 l/mol/cm. These compounds were characterised by strong solid-state fluorescence under long ultraviolet light (365 nm). Absorption and fluorescence spectra revealed that electron coupling originating from broad π-electron delocalisation and the keto–enol form is responsible for the large Stokes shift. These dyes were readily soluble in common solvents such as dichloromethane, chloroform, dimethyl formamide, tetrahydrofuran and dimethyl sulphoxide and were characterised by means of elemental analysis, proton nuclear magnetic resonance and mass spectrometry. Thermogravimetric analysis of solid-state fluorescent dyes show thermal stability up to 270 °C and can therefore be used for polymer application. The coloristic properties of these dyes were evaluated on polyester by the disperse dyeing method. DOI : 10.1111/j.1478-4408.2010.00268.x En ligne : http://onlinelibrary.wiley.com/doi/10.1111/j.1478-4408.2010.00268.x/pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=10246
in COLORATION TECHNOLOGY > Vol. 126, N° 6 (2010) . - p. 348-352[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 012590 - Périodique Bibliothèque principale Documentaires Disponible UV-visible technique for studying powder coatings and their dissolution / Önder Pekcan in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 73, N° 923 (12/2001)
[article]
Titre : UV-visible technique for studying powder coatings and their dissolution Type de document : texte imprimé Auteurs : Önder Pekcan, Auteur ; Ertan Arda, Auteur Année de publication : 2001 Article en page(s) : p. 51-60 Note générale : Bibliogr. Langues : Américain (ame) Tags : Etude expérimentale Spectrométrie UV visible Recuit Traitement thermique Heptane Chloroforme Solvant organique Dissolution Méthacrylate de méthyle polymère Latex Formation film Peinture poudre Matériau revêtement Index. décimale : 667.9 Revêtements et enduits Résumé : UV-Visible (UVV) technique was used to monitor powder coating and its dissolution processes from hard latex particles. Three sets of latex coatings were prepared from poly(methyl methacrylate) (PMMA) particles. The first set of coatings was annealed at elevated temperatures in various time intervals during which reflected photon intensity, Irf, was measured. The second set of coatings was annealed at various temperatures in 10 min time intervals during which transmitted intensity, Itr, was measured. Irf first decreased and then increased as the annealing temperature was increased. Decrease in Irf was explained with the void closure mechanism due to viscous flow. Increase in Itr and Irf against time and temperature were attributed to an increase in crossing density at the junction surface. The activation energy of viscous flow, delta H, was measured and found to be around 8 kcal/mol and the back and forth activation energies (delta Erf and delta Etr) were measured and found to be around 49 and 53 kcal/mol for a reptating polymer chain across the junction surface. Diffusion of solvent molecules (chloroform) into the annealed latex coatings was followed by desorption of PMMA chains for the third set of films. Desorption of pyrene, P, labeled PMMA chains was monitored in real-time by the absorbance change of pyrene in the polymer-solvent mixture. A diffusion model with a moving boundary was employed to quantify real-time UVV data. Diffusion coefficients of desorbed PMMA chains were measured and found to be between 2 and 0.6 x 10-11 cm2 s-1 in the 100 and 275°C temperature range. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5771
in JOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 73, N° 923 (12/2001) . - p. 51-60[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 001231 - Périodique Bibliothèque principale Documentaires Disponible