Application of thermochromic colorants on textiles : temperature dependence of colorimetric properties / Muksit A. Chowdhury in COLORATION TECHNOLOGY, Vol. 129, N° 3 (06/2013)  

[article]  inCOLORATION TECHNOLOGY > Vol. 129, N° 3 (06/2013) . - p. 232-237 Titre : Application of thermochromic colorants on textiles : temperature dependence of colorimetric properties Type de document : texte imprimé Auteurs : Muksit A. Chowdhury, Auteur ; Bhupendra S. Butola, Auteur ; Mangala Joshi, Auteur Année de publication : 2013 Article en page(s) : p. 232-237 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Colorants Conduction électrique 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). Fil core spun Fil Core Spun – Ce type de fil est fabriqué en tournant des fibres autour un filament. Le fil core spun consiste en deux éléments, une fibre filée et un deuxième materiel. En cas de coton et de viscose c’est normalement l’élastanne. Le fil core spun est utilisé dans les articles de couture, les chaussettes et les couvertures. Résistance au lavage Textiles et tissus Thermochromie Index. décimale : 667.3 Teinture et impression des tissus Résumé : Commercial thermochromic colorants were applied to a conductive cotton fabric prepared by using nichrome/cotton core-spun yarns in weft and 100% cotton in warp. The fabrics were pretreated and coloured with thermochromic pigments in isolation, in combination with each other, or in a mixture with a non-thermochromic pigment. The weft yarns were joined to allow passage of current through the fabric to enable ohmic heat generation to increase fabric temperature. The heat generation and temperature rise could be controlled by monitoring the voltage applied. The colour of the samples changed gradually with an increase in temperature, and significantly so when the temperature of the fabric rose beyond the activation temperature of the thermochromic colorant. The temperature-dependent properties of commercial thermochromic colorants were determined using a spectrophotometer. Wash fastness of the samples was found to be fair in all cases except with the yellow colorant. Predetermined colour effects, such as camouflage or novel design, can be produced by combining thermochromic colorants with conventional pigments or thermochromic colorants with different activation temperatures. Note de contenu : - EXPERIMENTAL : Sample preparation - RSULTS AND DISCUSSION : Effect of voltage on temperature - Effect on temperature on reflectance spectra - Effect of temperature on ?* and ?* values - Determination of hal-life of samples - Wash fastness of samples DOI : 10.1111/cote.12015 En ligne : http://onlinelibrary.wiley.com/doi/10.1111/cote.12015/pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18497 [article]

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Studies on the dyeability and dyeing mechanism of polyurethane/clay nanocomposite filaments with acid, basic and reactive dyes / Gude Venkatareddy Raghunath Reddy in COLORATION TECHNOLOGY, Vol. 134, N° 2 (04/2018)  

[article]  inCOLORATION TECHNOLOGY > Vol. 134, N° 2 (04/2018) . - p. 117-125 Titre : Studies on the dyeability and dyeing mechanism of polyurethane/clay nanocomposite filaments with acid, basic and reactive dyes Type de document : texte imprimé Auteurs : Gude Venkatareddy Raghunath Reddy, Auteur ; Mangala Joshi, Auteur ; Bapan Adak, Auteur ; Bansi Lal Deopura, Auteur Année de publication : 2018 Article en page(s) : p. 117-125 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Argile Colorants Dispersions et suspensions Fibres textiles synthétiques -- Détérioration Filature Matériaux hybrides Polyuréthanes Teinture -- Fibres textiles synthétiques Index. décimale : 667.3 Teinture et impression des tissus Résumé : Polyurethane/clay nanocomposite (PUCN) filaments were spun by the dry‐jet‐wet spinning method. To prepare the PUCN filaments, 0.25, 0.50 and 1% of nanoclay on the weight of polyurethane were incorporated in the polyurethane dope. The interaction between clay and polyurethane was analysed by attenuated total reflectance–Fourier Transform‐infrared (ATR‐FTIR) spectroscopy. The structure and morphology of the PUCN filaments were analysed by wide‐angle X‐ray diffraction (WAXD) and transmission electron microscopy (TEM). Both the neat polyurethane and the PUCN filaments were dyed with different acid, basic and reactive dyes. The neat polyurethane filaments exhibited poor dyeability with all three classes of dyes. By contrast, the PUCN filaments showed a significantly higher dye uptake with all of the dyes used. Furthermore, the dye uptake increased significantly as the percentage of clay in the filaments increased, as indicated by the increase in the K/S values of the dyed filaments. The dyeing mechanism with all three dyes, as well as the increased dyeability of the PUNC filaments in comparison to those of the neat polyurethane filaments, was discussed. Note de contenu : - EXPERIMENTAL : Materials and methods - Preparation of PUCN filaments - Dyeing of the filaments - After treatment of the dyed filaments - Characterisation - RESULTS AND DISCUSSION : ATR-FTIR analysis - Structure of PUCN filaments - Dispersion of organoclay in PU matrix - Dyeability studies DOI : 10.1111/cote.12332 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12332 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30316 [article]

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