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Mention de date : 08/2016
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The effect of different radiation sources for the UV curing of a screen-printed, water-based polyurethane acrylate binder / Gökhan Akbulut in COLORATION TECHNOLOGY, Vol. 132, N° 4 (08/2016)
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Titre : The effect of different radiation sources for the UV curing of a screen-printed, water-based polyurethane acrylate binder Type de document : texte imprimé Auteurs : Gökhan Akbulut, Auteur ; Burcak Karaguzel Kayaoglu, Auteur ; Mesut Eren, Auteur ; Bülent Yildiz, Auteur ; Murat Orbay, Auteur Année de publication : 2016 Article en page(s) : p. 270-279 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Copolymère uréthane acrylate
Dioxyde de titane
Impression sur étoffes
Liants
Pâte pigmentaire
Pâtes d'impression
Photoamorceurs (chimie)
Pigments
Rayonnement ultraviolet
Rhéologie
SérigraphieIndex. décimale : 667.3 Teinture et impression des tissus Résumé : In this paper, titanium-dioxide-pigmented printing pastes of water-borne, UV-curable polyurethane acrylate binder with two different UV-curing photoinitiator combinations were prepared and screen printed on a black t-shirt fabric. The effects of mercury and gallium radiation sources employed either singly or in combination for UV curing and the total energy level on the printing performance were investigated. The cured textile samples were subjected to colour measurements before and after five cycles of washing, and hiding power and changes in chromacity, hue, and colour were determined. Single-lamp applications of mercury and gallium were not satisfactory, and opaque pigment hindered deep curing, especially at thicker coating levels. It was found that employment of a mercury–gallium lamp system applying an irradiation at medium level can provide pigment printing of opaque white inks with excellent coverage, washing resistance, and medium hardness. Note de contenu : - UV-radiation curing and pendulum hardness
- Fourier transform infrared spectroscopy
- Rheological behaviour of pigment pastes
- CIELab colour, coverage, ang gloss measurement of printed fabrics
- Photographic images of washed printed samplesDOI : 10.1111/cote.12219 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12219 Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=26729
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Code-barres Cote Support Localisation Section Disponibilité 18246 - Périodique Bibliothèque principale Documentaires Disponible The clearing of dyed polyester. Part 1. A comparison of traditional reduction clearing with treatments using organic reducing agents / Anwar ul Aleem in COLORATION TECHNOLOGY, Vol. 132, N° 4 (08/2016)
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Titre : The clearing of dyed polyester. Part 1. A comparison of traditional reduction clearing with treatments using organic reducing agents Type de document : texte imprimé Auteurs : Anwar ul Aleem, Auteur ; Robert M. Christie, Auteur Année de publication : 2016 Article en page(s) : p. 280-296 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Colorants
Dioxyde de thiouréeAgent réducteur, de blanchiment ou de décoloration utilisé dans l'industrie textile, l'industrie des pâtes et papier et les procédés photographiques.
Dithionite de sodium
Hydroxyacétone
Polyesters
Réduction (chimie)
Solutions aqueuses (chimie)
Teinture -- Fibres textiles synthétiquesIndex. décimale : 667.3 Teinture et impression des tissus Résumé : Reduction clearing using aqueous sodium dithionite under alkaline conditions at elevated temperatures is commonly carried out as an aftertreatment to remove deposits of disperse dye and other impurity residues from the surface of dyed polyester. In this paper, the effect of conventional reduction clearing on the colour and fastness properties of polyester dyed with a series of selected commercial disperse dyes at a range of depths of shade is established, and an understanding of the scientific principles is developed. The results correlate closely with an assessment of surface dye removal by cold acetone extraction of the dyed samples. Because of certain environmental, technological, and economic disadvantages associated with traditional reduction clearing using sodium dithionite, there is industrial interest in alternatives. Thus, this paper also describes a study of the use of two organic reducing agents, thiourea dioxide and hydroxyacetone, and the relative merits of the three processes are discussed. The outcome of clearing varies with the particular dye. Mechanistic explanations are proposed, based on individual characteristics of the molecular structures of the dyes. Scanning electron microscopic investigations of the surface of dyed samples before and after reduction clearing were qualitatively consistent with the assessments of the technical performance. This paper is the first in a series in which we will subsequently report further comparative studies, based on similar methodology, exploring alternative clearing processes. Note de contenu : - EXPERIMENTAL : Materials - Dyeing - Reduction clearing with sodium dithionite - Reduction clearing with TUDO/FAS and hydroxyacetone - Assessment of surface dye removal - Assessment of fastness properties - Colour measurement - Scanning electron microscopy - Redox potential - BOD/COD
- RESULTS AND DISCUSSION : General principles - Conventional reduction clearing with sodium dithionite - Clearing with the organic reducing agentsDOI : 10.1111/cote.12217 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12217 Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=26730
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Code-barres Cote Support Localisation Section Disponibilité 18246 - Périodique Bibliothèque principale Documentaires Disponible A novel approach to using neural networks to predict the colour of fibre blends / Caroline Hemingray in COLORATION TECHNOLOGY, Vol. 132, N° 4 (08/2016)
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Titre : A novel approach to using neural networks to predict the colour of fibre blends Type de document : texte imprimé Auteurs : Caroline Hemingray, Auteur ; Stephen Westland, Auteur Année de publication : 2016 Article en page(s) : p. 297-303 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Mélanges de fibres
Prévision, Théorie de la
Réseaux neuronaux (informatique)
ViscoseIndex. décimale : 667.9 Revêtements et enduits Résumé : This work is concerned with the colour prediction of viscose fibre blends, comparing two conventional prediction models (the Stearns–Noechel model and the Friele model) and two neural network models. A total of 333 blended samples were prepared from eight primary colours, including two-, three-, and four-colour mixtures. The performance of the prediction models was evaluated using 60 of the 333 blended samples. The other 273 samples were used to train the neural networks. It was found that the performance of both neural networks exceeded the performance of both conventional prediction models. When the neural networks were trained using the 273 training samples, the average CIELAB colour differences (between measured and predicted colour of blends) for the 60 samples in the test set were close to 1.0 for the neural network models. When the number of training samples was reduced to only 100, the performance of the neural networks degraded, but they still gave lower colour differences between measured and predicted colour than the conventional models. The first neural network was a conventional network similar to that which has been used by several other researchers; the second neural network was a novel application of a standard neural network where, rather than using a single network, a set of small neural networks was used, each of which predicted reflectance at a single wavelength. The single-wavelength neural network was shown to be more robust than the conventional neural network when the number of training examples was small. DOI : 10.1111/cote.12220 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12220 Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=26731
in COLORATION TECHNOLOGY > Vol. 132, N° 4 (08/2016) . - p. 297-303[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 18246 - Périodique Bibliothèque principale Documentaires Disponible Textile applications of commercial photochromic dyes. Part 6 : photochromic polypropylene fibres / Anna F Little in COLORATION TECHNOLOGY, Vol. 132, N° 4 (08/2016)
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Titre : Textile applications of commercial photochromic dyes. Part 6 : photochromic polypropylene fibres Type de document : texte imprimé Auteurs : Anna F Little, Auteur ; Robert M. Christie, Auteur Année de publication : 2016 Article en page(s) : p. 304-309 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Absorbeurs de rayonnement ultraviolet
Colorants photochromiques
CotonLe 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).
Extrusion filage
Naphtopyranne
Photostabilité
Polypropylène
Sérigraphie
Spirooxazine
Stabilisants (chimie)
Teinture -- Fibres textiles synthétiquesIndex. décimale : 667.3 Teinture et impression des tissus Résumé : Two commercial photochromic dyes, a spirooxazine and a napthopyran, were successfully incorporated into polypropylene fibres by melt extrusion to produce fibres that showed intense photochromism. The technical performance of the photochromic dyes was investigated using a methodological approach that has been established and validated for the dyes applied by screen printing onto textiles in previous publications in this series. These parallel investigations allowed a comparison of the properties of the dyes in polypropylene and screen printed on cotton. The photocolorability of both dyes was found to be significantly higher in polypropylene compared with screen prints on cotton when applied at the same dye concentration. Of particular interest was the observation of positive solvatochromism, providing evidence that the photochromism is due to the colorants in solution in both media. The colour development rates during UV exposure of the dyes applied by screen printing cotton and by extrusion into polypropylene were similar. However, differences were observed in the thermal fading rates after removal of the UV source, in that the spirooxazine dye reverted more slowly in polypropylene, while the reverse was true in the case of the naphthopyran. Both dyes showed better photostability in polypropylene than in screen-printed textiles. A UV absorber and two hindered amine light stabilisers were found significantly to enhance the photostability of the dyes in polypropylene, although the presence of the UV absorber reduced the degree of photocoloration. Note de contenu : - Instrumentation and equipment
- Photostability
- Materials and application methodologyDOI : 10.1111/cote.12221 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12221 Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=26732
in COLORATION TECHNOLOGY > Vol. 132, N° 4 (08/2016) . - p. 304-309[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 18246 - Périodique Bibliothèque principale Documentaires Disponible Synthesis of quenchers to control the fluorescence of Rhodamine B and improve the contrast ratio of blue filters for LCDs / Hyun-young Lee in COLORATION TECHNOLOGY, Vol. 132, N° 4 (08/2016)
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Titre : Synthesis of quenchers to control the fluorescence of Rhodamine B and improve the contrast ratio of blue filters for LCDs Type de document : texte imprimé Auteurs : Hyun-young Lee, Auteur ; Hye-Sun Kwon, Auteur ; Jin-Kyu Oh, Auteur ; Hye-Min Lee, Auteur ; Jae-Hong Choi, Auteur Année de publication : 2016 Article en page(s) : p. 310-319 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse spectrale
Caractérisation
Colorants -- Solubilité
Colorants -- Synthèse
Filtres
Fluorescence
Stabilité thermiqueIndex. décimale : 667.3 Teinture et impression des tissus Résumé : In this study, seven quenchers (derived from either anthraquinone, phthalimidylazo, or dipyrromethene chromophores) were prepared as candidates for additives to suppress fluorescence in blue colour filters and thus improve their contrast ratio. To reduce fluorescence effectively, quenchers must have typical properties such as spectral compatibility by which the absorbance spectrum of the quencher overlaps the fluorescence emission spectrum, exhibit high molar extinction coefficients, and exert little influence on the colour of the blue filter. The seven quenchers possessed absorption maxima of approximately 570–620 nm and reduced fluorescence (by more than 24%). Those quenchers tested in filter coatings increased their contrast ratios by about 50%. They thus effectively quenched fluorescence of the blue filter but without greatly affecting the chromaticity coordinates of the filters. Note de contenu : - EXPERIMENTAL : Materials and instrumentation - Synthesis - Colour filter preparation - Investigation of solubility - Measurement of spectroscopic properties - Measurement of thermal stability
- RESULTS AND DISCUSSION : Synthesis of dyes - Quencher solubility - Characterisation of quencher spectroscopic properties - Fluorescence properties and FRET efficiency - Spectroscopic and colour properties of filters - Characterisation of thermal stabilityDOI : 10.1111/cote.12222 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12222 Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=26733
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Code-barres Cote Support Localisation Section Disponibilité 18246 - Périodique Bibliothèque principale Documentaires Disponible Synthesis and application of dyes derived from benz[cd]indol-2(1H)-one as visible-light-absorbing polymerisation photoinitiators / Rafal Strzelczyk in COLORATION TECHNOLOGY, Vol. 132, N° 4 (08/2016)
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Titre : Synthesis and application of dyes derived from benz[cd]indol-2(1H)-one as visible-light-absorbing polymerisation photoinitiators Type de document : texte imprimé Auteurs : Rafal Strzelczyk, Auteur ; Radoslaw Michalski, Auteur ; Radoslaw Podsiadly, Auteur Année de publication : 2016 Article en page(s) : p. 320-326 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Colorants -- Synthèse
Lumière -- Absorption
Photoamorceurs (chimie)
Photochimie
PolyadditionIndex. décimale : 667.3 Teinture et impression des tissus Résumé : Several potential initiators based on benz[cd]indol-2(1H)-one dye have been synthesised and evaluated in the radical polymerisation of a system containing trimethylolpropane triacrylate under visible light. Absorption, fluorescence, and phosphorescence spectra and the electrochemical properties of these novel dyes were determined. Owing to the presence of an appropriate hydrogen donor group in their structure, these photoinitiators do not need an extra coinitiator to initiate the polymerisation process. During photopolymerisation they act both as a triplet sensitiser and as a hydrogen donor. The relationship between the polymerisation rate and the triplet-excited-state reduction potential suggests that initiating radicals are formed from the triplet state via hydrogen transfer. This mechanism is supported by density functional theory calculations. 8-Bromo-6-[(2-sulphanylethyl)sulphanyl]benzo[cd]indol-2(1H)-one and 8-bromo-6-sulphanylbenz[cd]indol-2(1H)-one may be applied as visible-light initiators of free radical polymerisation to obtain a low-molecular-weight polymer. Note de contenu : - General
- Synthesis
- Photochemical experiments
- Quantum chemical calculationsDOI : 10.1111/cote.12218 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12218 Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=26734
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Code-barres Cote Support Localisation Section Disponibilité 18246 - Périodique Bibliothèque principale Documentaires Disponible Radical mechanism of azo cleavage for monoazo reactive dyes, a QSPR study : the similarity between photoreduction on polyamide substrates and thermal reduction in aqueous dithionite solutions / Yasuyo Okada in COLORATION TECHNOLOGY, Vol. 132, N° 4 (08/2016)
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Titre : Radical mechanism of azo cleavage for monoazo reactive dyes, a QSPR study : the similarity between photoreduction on polyamide substrates and thermal reduction in aqueous dithionite solutions Type de document : texte imprimé Auteurs : Yasuyo Okada, Auteur ; Toshio Hihara, Auteur ; Zenzo Morita, Auteur Année de publication : 2016 Article en page(s) : p. 327-343 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Colorants azoïques
Colorants réactifs
Dithionite de sodium
Polyamide 6
Réduction (chimie)
Solutions aqueuses (chimie)
ThermochimieIndex. décimale : 667.3 Teinture et impression des tissus Résumé : The same radical mechanism occurs in reductive azo cleavage via monohydrogenated radicals generated as the starting reactants in photo- and thermal (by dithionite) reduction on a nylon 6 substrate and in aqueous and alcoholic solutions. The rates of photo- and thermal azo cleavage in the solid and liquid phases have been thermochemically analysed by calculating the heats of formation of the reactants, intermediates, and products for (1) intramolecular hydrogen transfer (self-decomposition via rearrangement) in the photo- and radically induced hydrazinyl radicals as well as for (2) the disproportionation (redox reaction) between the radicals via a molecular orbital method. The rates of reductive fading (or azo cleavage) are controlled by the heats of reaction via reaction pathways (1) and (2) as well as by rearrangement, depending on the reaction system. Photoreduction of these dyes on polyamide generated the same end products – diazo components and iminooxoquinones from the coupling component – as the products of thermal reduction in aqueous sodium dithionite and of photoreduction in the liquid phase. Photofading on polyamide substrates owing to continuous irradiation is controlled by three factors: the quantum yield of photoinduced hydrazinyl radicals, its rearrangement processes, and the heats of reaction for the thermal azo cleavage reactions via the two pathways. These factors may become molecular descriptors that correlate the rates of fading with molecular structures. The present study may become an introductory trial to construct quantitative structure–property relationship modelling for reduction-fast azo dyes. Note de contenu : - EXPERIMENTAL : Dyes used - Parameters used for the analysis - Materials : dyeing and exposure
- RESULTS AND DISCUSSION : Formation of the (MHN) moiety - Thermochemical analysis for the rates of thermal reduction of food azo dyes - Rates of photoreduction for model azo dyes in an alcoholic aqueous solution - Photoreduction of reactive azo dyes on PA substratesDOI : 10.1111/cote.12223 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12223 Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=26735
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Code-barres Cote Support Localisation Section Disponibilité 18246 - Périodique Bibliothèque principale Documentaires Disponible Synthesis and salt-free dyeing characteristics of cationic reactive dyes containing polyetheramine segments / Guo W. Wang in COLORATION TECHNOLOGY, Vol. 132, N° 4 (08/2016)
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Titre : Synthesis and salt-free dyeing characteristics of cationic reactive dyes containing polyetheramine segments Type de document : texte imprimé Auteurs : Guo W. Wang, Auteur ; Chun L. Zheng, Auteur ; Sun Jie, Auteur Année de publication : 2016 Article en page(s) : p. 344-349 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Colorants -- Adsorption
Colorants -- Synthèse
Colorants cationiques
Colorants réactifs
Fibres cellulosiques
Polyéther amine
Teinture -- Fibres textilesIndex. décimale : 667.3 Teinture et impression des tissus Résumé : A series of cationic reactive dyes containing both quaternary ammonium and polyetheramine as soluble groups and monochlorotriazine as a reactive group have been synthesised and applied to cellulose fibre by salt-free exhaust dyeing. Investigation of the synthesis method and dyeing properties of these cationic reactive dyes showed that the best pH value for these dyes is 6, and also that these cationic reactive dyes give a high substantivity to cellulose. In the salt-free dyeing process, their adsorption was consistent with the Langmuir isotherm during the primary exhaustion stage, but in the secondary exhaustion stage the adsorption was in accordance with the Freundlich isotherm, and their secondary exhaustion reached up to 96% and above. Moreover, the degree of fixation, the levelling, and the transfer properties on cotton fabric were good. Light fastness reached grade 5–6, washing, perspiration, and dry rubbing fastness reached grade 4 and above, but wet rubbing fastness reached only grade 3–4. Note de contenu : - EXPERIMENTAL : Materials and chemicals - Synthesis of reactive cationic dyes - Dyeing procedure - Colour strength of dyes on fabric - Measurement of dye exhaustion and fixation - Levelling properties - Transfer properties - Fastness testing
- RESULTS AND DISCUSSION : Application of dyes - Effect of pH on dyeing performance - Levelling and transfer properties - Fastness propertiesDOI : 10.1111/cote.12225 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12225 Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=26736
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