Environmentally friendly coloration of cotton by the UV-induced photografting of a-bromoacrylamido dyes / Yuanyuan Dong in COLORATION TECHNOLOGY, Vol. 130, N° 4 (08/2014)  

[article]  inCOLORATION TECHNOLOGY > Vol. 130, N° 4 (08/2014) . - p. 296-304 Titre : Environmentally friendly coloration of cotton by the UV-induced photografting of a-bromoacrylamido dyes Type de document : texte imprimé Auteurs : Yuanyuan Dong, Auteur ; Jinho Jang, Auteur Année de publication : 2014 Article en page(s) : p. 296-304 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse spectrale Copolymérisation Coton Le coton est une fibre végétale qui entoure les graines des cotonniers "véritables"(Gossypium sp.), un arbuste de la famille des Malvacées. Cette fibre est généralement transformée en fil qui est tissé pour fabriquer des tissus. Le coton est la plus importante des fibres naturelles produites dans le monde. Depuis le XIXe siècle, il constitue, grâce aux progrès de l'industrialisation et de l'agronomie, la première fibre textile du monde (près de la moitié de la consommation mondiale de fibres textiles). Greffage (chimie) Photochimie Teinture -- Fibres textiles Index. décimale : 667.3 Teinture et impression des tissus Résumé : Conventional wet dyeing based on dye diffusion and adsorption in water requires large amounts of salt, time, and energy. ?-Bromoacrylamido dyes are photografted onto cotton at room temperature as an environmentally friendly coloration process. Dye-originated radicals are produced by the photoscission of the carbon–sulfur and carbon–bromine bonds of the dyes and subsequently abstract hydrogen atoms to generate cellulose radicals which can initiate graft copolymerisation. About 88% of the dyes are polymerised, and the degree of polymerisation is estimated to be 12.7 or more, which was substantiated by mass and elemental analyses. The colour yield of the photografted cotton is seven times higher than that of conventional dyeing. Furthermore, good colour fastness properties are attributed to the water-insoluble polymeric dyes formed. Note de contenu : - EXPERIMENTAL : Materials and methods - Photografting of ?-bromoacrylamido dyes - Characterisation of the photoreacted dyes - The assessment of dyeing - RESULTS AND DISCUSSION : Elemental analysis - Mass spectrometric analysis - NMR analysis - IR and UV-vis spectroscopy - The effect of UV energy and photoinitiator and dye concentrations - Colour fastness properties DOI : 10.1111/cote.12094 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12094 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=21782 [article]

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The enhanced cationic dyeability of ultraviolet/ozone-treated meta-aramid fabrics / Yuanyuan Dong in COLORATION TECHNOLOGY, Vol. 127, N° 3 (2011)  

[article]  inCOLORATION TECHNOLOGY > Vol. 127, N° 3 (2011) . - p. 173-178 Titre : The enhanced cationic dyeability of ultraviolet/ozone-treated meta-aramid fabrics Type de document : texte imprimé Auteurs : Yuanyuan Dong, Auteur ; Jinho Jang, Auteur Année de publication : 2011 Article en page(s) : p. 173-178 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Colorants cationiques Fibre aramide Oxydation Ozone Photo-oxydation Rayonnement ultraviolet Teinture -- Fibres textiles synthétiques Index. décimale : 667.3 Teinture et impression des tissus Résumé : Aramid fabrics were photo-oxidised by ultraviolet/ozone irradiation. The surface properties of the modified fabrics were characterised by reflectance, attenuated total reflectance, electron spectroscopy for chemical analysis and surface zeta potential. The ultraviolet irradiation caused the oxygen content of the aramid fabric surface to increase, with the appearance of carbonyl and hydroxyl groups, and reduced the surface zeta potential, coupled with improved water wettability. Moreover, the crystalline structure did not change after ultraviolet/ozone treatment according to X-ray diffraction results. The modified aramid fabrics showed higher affinity to cationic dyes, which may have resulted from the newly introduced electrostatic interaction between cationic dyes and anionic dyeing sites on the photo-oxidised surface layers. Although colour fastness to both staining and rubbing were good to excellent, colour fastness to shade change was moderate. Furthermore, the ultraviolet/ozone pretreatment and cationic dyeing of aramid fabrics may overcome the loss in the mechanical properties associated with previously recommended dyeing methods for aramid fabrics. Note de contenu : EXPERIMENTAL : Materials and chemicals - Ultraviolet/ozone treatments - Surface characterisation - Mechanical properties - Cationic dyeing - The evaluation of dyeing RESULTS AND DISCUSSION : Reflectance and scanning electron microscopy analysis - Wettability of aramid fabric - Surface analysis and mechanical properties - Dyeability to cationic dyes DOI : 10.1111/j.1478-4408.2011.00295.x En ligne : http://onlinelibrary.wiley.com/doi/10.1111/j.1478-4408.2011.00295.x/pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12200 [article]

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