Effects of alkali and ultraviolet treatment on colour strength and mechanical properties of jute yarn / Ali A. Zolriasatein in COLORATION TECHNOLOGY, Vol. 128, N° 5 (2012)  

[article]  inCOLORATION TECHNOLOGY > Vol. 128, N° 5 (2012) . - p. 395-402 Titre : Effects of alkali and ultraviolet treatment on colour strength and mechanical properties of jute yarn Type de document : texte imprimé Auteurs : Ali A. Zolriasatein, Auteur ; Mohammad Esmail Yazdanshenas, Auteur ; Ramin Khajavi, Auteur ; Abosaeed Rashidi, Auteur Année de publication : 2012 Article en page(s) : p. 395-402 Note générale : Errata (voir URL) - Bibliogr. Langues : Anglais (eng) Catégories : Bases (chimie) Colorants réactifs Essais dynamiques Fibres végétales -- Propriétés mécaniques Jute et constituants Le jute est une plante herbacée de la famille des Malvacées, cultivée dans les régions tropicales pour ses fibres. Jute est aussi le nom donné à ces fibres textiles, appelées aussi chanvre de Calcutta. Nom scientifique : Corchorus capsularis L., famille des Malvacées, sous-famille des Grewioideae ; la classification classique le situe dans la famille des Tiliacées. Une plante voisine, Corchorus olitorius L., la corète potagère, est aussi utilisée aux mêmes fins. Rayonnement ultraviolet Solutions aqueuses (chimie) Teinture -- Fibres textiles Traction (mécanique) Index. décimale : 667.3 Teinture et impression des tissus Résumé : In this study, jute yarns were treated with an aqueous alkali solution and ultraviolet light to improve dyeability. Ultraviolet light treatments were carried out at an air pressure of 1 atm, under water and vacuum, and all the samples were dyed with reactive dyes. Virgin samples and treated jute yarns were analysed by Fourier Transform–infrared spectroscopy. K/S values were determined by a reflective spectrophotometer and used to establish the fixation values and colour strength of the dyed samples. The tensile mechanical properties of the samples were also measured by a tensile testing apparatus and were compared with the virgin samples. Alkali treatment resulted in a reduction in carbonyl group concentration. However, atmospheric ultraviolet light treatment increased carbonyl group concentration. Dyeability and dye fixation values for atmospheric and underwater ultraviolet light-treated samples increased. Furthermore, the loss of tensile strength for alkali-treated samples was much greater than others (up to 50%) in comparison with ultraviolet light-treated samples. Note de contenu : - EXPERIMENTAL : Materials - Alkali and UV light treatment - Dyeing and determination of colour strength - Dye fixation assessment - Fourier transform-infrared spectroscopy - Mechanical properties and moisture regain - RESULTS AND DISCUSSION : Fibre characterisation - Effect of alkali and UV light treatment on the shade of jute yarns - Dye strength of alkali and UV light treated jute yarns - Effect of UV light treatment in atmosphere and water on the dye strength of reactive dye - Effect of UV light treatment in atmosphere, water and vacuum on fixation of reactive dye - Mechanical properties. DOI : 10.1111/j.1478-4408.2012.00393.x En ligne : http://onlinelibrary.wiley.com/doi/10.1111/j.1478-4408.2012.00393.x/pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15808 [article]

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The role of nanoclay partitioning and fibril formation on dyeability of blend nanocomposite fibres / Ahmad Bigdeli in COLORATION TECHNOLOGY, Vol. 129, N° 4 (08/2013)  

[article]  inCOLORATION TECHNOLOGY > Vol. 129, N° 4 (08/2013) . - p. 289–297 Titre : The role of nanoclay partitioning and fibril formation on dyeability of blend nanocomposite fibres Type de document : texte imprimé Auteurs : Ahmad Bigdeli, Auteur ; Hossein Nazockdast, Auteur ; Abosaeed Rashidi, Auteur ; Mohammad Esmail Yazdanshenas, Auteur Année de publication : 2013 Article en page(s) : p. 289–297 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Argile Composites Compoundage Extrudeuse bi-vis Extrusion filage Fibrillation Matériaux hybrides Microscopie électronique à balayage Microscopie électronique en transmission Nanoparticules Polybutylène téréphtalate Polypropylène Rhéologie Teinture -- Fibres textiles synthétiques Index. décimale : 667.3 Teinture et impression des tissus Résumé : The aim of the present work was to study the effect of microstructure and microfibril formation on dyeability of polypropylene/poly(butylene terephthalate)/organoclay blend nanocomposite fibres. The blend nanocomposite samples with the same blend ratio but varying in organoclay content were prepared via melt compounding by using a co-rotating twin screw extruder. The microfibrillar morphology and nanoclay partitioning were studied using scanning electron microscopy and transmission electron microscopy together with rheological results. The presence of nanoclay in the form of tactoids in the polypropylene matrix accelerated the dye sorption but much greater ultimate dye uptake could be achieved for the sample in which the major part of the platelets were preferentially located inside the poly(butylene terephthalate) fibrils. Although increasing the organoclay concentration increased the ultimate dye uptake, it limited the fibril formation at higher organoclay concentration. The utilisation of a compatibiliser was found to have an enhancing effect on ultimate dye uptake. This could be explained in terms of the interfacial role of the compatibiliser in improving microfibril formation as well as partitioning a fraction of nanoclay platelets inside the polypropylene matrix. DOI : 10.1111/cote.12038 En ligne : http://onlinelibrary.wiley.com/doi/10.1111/cote.12038/pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=19042 [article]

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