New insights into dye chemistry and physics / Stephen N. Batchelor in COLORATION TECHNOLOGY, Vol. 131, N° 2 (04/2015)  

[article]  inCOLORATION TECHNOLOGY > Vol. 131, N° 2 (04/2015) . - p. 81-93 Titre : New insights into dye chemistry and physics Type de document : texte imprimé Auteurs : Stephen N. Batchelor, Auteur Année de publication : 2015 Article en page(s) : p. 81-93 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Colorants -- Détérioration Colorants -- Oxydation Colorants azoïques Fibres cellulosiques Hydrolyse Photodétérioration Solutions aqueuses (chimie) Teinture -- Fibres textiles Index. décimale : 667.3 Teinture et impression des tissus Résumé : A review of the academic dye research performed by the Port Sunlight group and its coworkers over the past 15 years is presented. The work is focused on three areas: (1) substrate structure; (2) dye interactions in aqueous solution and on substrates; (3) dye degradation and products. For substrates, a detailed model of the nanoenvironment experienced by chemicals within cellulose fibre is given, showing the different environments and remarkable mobility of absorbed chemicals. Advanced nuclear magnetic resonance diffusion measurements provide the complex pathways by which compounds find their way in and out of the fibre. For dye interaction, detailed theoretical and experimental studies are reported on three model dye systems, the anionic monoazo dye Orange II, the bisazo anionic dye CI Direct Blue 1, and cationic monoazo thiazolium dyes, providing a comprehensive picture of their structure. A quantitative mechanism of dye binding to cellulose is shown. Resonance Raman provides an effective forensic tool for dye identification, even from single fibres. The products and kinetics of Orange II dye degradation by one-electron reduction in aqueous solution is given, with the identification of an indophenol dye end-product. In cellulosic materials the reduction mechanism is similar to solution, when the higher microviscosity is accounted for. Hydrolysis of thiazolium dyes occurs at both aromatic rings of the dye but on different timescales. Measurement and calculations of the electronic structures of one-electron-reduced and -oxidised dyes are presented. The mechanism of photooxidation by sunlight of azo dyes in cotton is delineated. Note de contenu : - NEW INSIGHTS INTO SUBSTRATE STRUCTURE : - NEW INSIGHTS INTO DYE INTERACTIONS IN AQUEOUS SOLUTION AND ON SUBSTRATES : CI Direct Blue 1 - Cationic monoazo dyes - Forensic identification of dyes - Dye substantivity to cotton - NEW INSIGHTS INTO DYE DEGRADATION AND PRODUCTS : One-electron reduction and oxidation of anthraquinone, triphenylmethane, and thiazine chromophores - Oxidation and reduction of Orange II - The mechanism of photofading - Hydrolysis of thiazolium dyes DOI : 10.1111/cote.12138 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12138 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=23655 [article]

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