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COLORATION TECHNOLOGY / Society of dyers and colourists . Vol. 135, N° 2Mention de date : 04/2019Paru le : 29/04/2019 |
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Ajouter le résultat dans votre panierThe colour properties of polyester/cotton knitted fabrics coated with poly(N-vinyl-2-pyrrolidone) / Giovana A. Vieira in COLORATION TECHNOLOGY, Vol. 135, N° 2 (04/2019)
[article]
Titre : The colour properties of polyester/cotton knitted fabrics coated with poly(N-vinyl-2-pyrrolidone) Type de document : texte imprimé Auteurs : Giovana A. Vieira, Auteur ; André Cadore Pereira, Auteur ; Ana Paula Serafini Immich, Auteur ; Antônio Augusto Ulson de Souza, Auteur ; Ivonete Oliveira Barcellos, Auteur Année de publication : 2019 Article en page(s) : p. 90-96 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : 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).
Enduction textile
Polyesters
Polyvinylpyrrolidone
Résistance à l'éclatement
Résistance au lavage
Solidité de la couleur
Statistique
Teinture -- Fibres textiles
TricotIndex. décimale : 667.3 Teinture et impression des tissus Résumé : The objective of this research was to investigate the use of crosslinked poly(N-vinyl-2-pyrrolidone) (PVP) to coat polyester/cotton knitted fabric, without adversely affecting its dyeing properties. Before dyeing, the knitted fabrics were tested for bursting strength to assess the influence of the coating on their resistance. The dyeing parameters were evaluated as the exhaustion (%), K/S value, colour difference (δE), relative strength (RS %) and colour fastness to washing. Bursting strengths were 9.4 for coated and 9.7 kgf cm−2 for uncoated knitted fabric samples, confirming an insignificant loss in resistance. In the evaluation of K/S, δE and RS%, the values for the samples with the highest concentration of PVP were the most different to those for the standard sample. The colour fastness showed satisfactory results indicating that neutralisation and washing after dyeing were effective. These results could lead to increased quality in the textile industry, adding value to products. Note de contenu : - EXPERIMENTAL : Coating of knitted fabric using PVP and crosslinking with ultraviolet (UV)-C radiation - Determination of bursting strength - Calculation of the gel content - Dyeing procedure - Determination of the dyeing properties - Determination of colour fastness to washing - Statistical evaluation of data
- RESULTS AND DISCUSSION : Determination of bursting strength - Determination of gel content - Determination of dyeing properties - Determination of colour fastness to washingDOI : 10.1111/cote.12375 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12375 Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32321
in COLORATION TECHNOLOGY > Vol. 135, N° 2 (04/2019) . - p. 90-96[article]Réservation
Réserver ce documentA sultone-based reversible dark red-yellow conversion thermochromic colorant with adjustable switching temperature / Wan Zhang in COLORATION TECHNOLOGY, Vol. 135, N° 2 (04/2019)
[article]
Titre : A sultone-based reversible dark red-yellow conversion thermochromic colorant with adjustable switching temperature Type de document : texte imprimé Auteurs : Wan Zhang, Auteur ; Xiaoqian Ji, Auteur ; Chanjuan Zeng, Auteur ; Yunjie Yin, Auteur ; Chaoxia Wang, Auteur Année de publication : 2019 Article en page(s) : p. 97-102 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Calorimétrie
Caractérisation
Colorants
Fourier, Spectroscopie infrarouge à transformée de
Jaune
Rouge (couleur)
SultonesLes sultones sont des molécules comportant un ester cyclique d'acide sulfonique (ester sulfonique, R-S(=O)2-O-R', cyclique), la dimension du cycle étant variable (en général de 3 à 7 atomes, les sultones les plus courantes ayant 4 ou 7 atomes, plus rarement 5).
Elles sont considérées comme des analogues soufrés des lactones, et leur nom provient de cette analogie : sulfo-lactone = sultone.
Les sultones sont souvent des intermédiaires réactionnels à vie courte, utilisés comme puissant agents alkylants ; en particulier la propio-1,3-sultone et ses dérivés.
En présence d'eau, elles s'hydrolysent lentement en leur acide hydrosulfonique. Chauffées, les sultones se décomposent et produisent des émanations toxiques et nauséabondes de dioxyde de soufre
Les oximes de sultones sont des intermédiaires clés dans la synthèse du zonisamide, un médicament anti-convulsif.
Les sultones sont classées comme toxiques, cancérigènes, mutagènes, et tératogéniques.
ThermochromieIndex. décimale : 667.2 Colorants et pigments Résumé : A reversible, adjustable thermochromic colorant with bichromatic conversion from dark red (cool state) to yellow (heat state) was prepared using bromocresol purple (BCP) as colour former. The thermochromic behaviour of this colorant was investigated during the heating‐cooling cycle, including the colour depth, colour difference and switching temperature. The mechanism of thermochromic colorant switching between dark red and yellow originated from the transformation of the conjugated structures of BCP, which was confirmed by infrared spectrometry. The switching temperature can be flexibility adjusted between 13-46 °C by mixing solvents according to Schröder's equation, which was demonstrated by differential scanning calorimetry measurement. The thermochromic colorant presented good reversible thermochromic performance with stable changes in colour parameters for 50 heating‐cooling cycles. This sultone‐based reversible dark red‐yellow conversion thermochromic colorant is suitable for application as thermal‐indicating material under various conditions. Note de contenu : - EXPERIMENTAL : Materials - Preparation of the thermochromic colorant - Characterisation - FTIR analysis - Colour coordinates - Differential scanning calorimetry analysis
- RESULTS AND DISCUSSION : The thermochromic mechanism - The switching temperature - The reversible propertyDOI : 10.1111/cote.12380 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12380 Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32322
in COLORATION TECHNOLOGY > Vol. 135, N° 2 (04/2019) . - p. 97-102[article]Réservation
Réserver ce documentPreparation of melamine-formaldehyde encapsulated fluorescent dye dispersion and its application to cotton fabric printing / Anran Hu in COLORATION TECHNOLOGY, Vol. 135, N° 2 (04/2019)
[article]
Titre : Preparation of melamine-formaldehyde encapsulated fluorescent dye dispersion and its application to cotton fabric printing Type de document : texte imprimé Auteurs : Anran Hu, Auteur ; Hongyun Peng, Auteur ; Min Li, Auteur ; Shaohai Fu, Auteur Année de publication : 2019 Article en page(s) : p. 103-110 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Colorants
Copolymère mélamine-formaldéhyde
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).
Dispersions et suspensions
Encapsulation
Fluorescence
Impression sur étoffes
Jaune
Résistance à l'abrasion
Résistance au lavage
SérigraphieIndex. décimale : 667.3 Teinture et impression des tissus Résumé : In this study, CI Solvent Yellow 43 was encapsulated by melamine-formaldehyde (MF) resin via in situ polymerisation to prepare the core-shell structured fluorescent pigment. Fourier Transform-infrared spectroscopy, transmission electron microscopy, scanning electron microscopy, thermogravimetric analysis and differential scanning calorimetry were used to characterise the encapsulated CI Solvent Yellow 43, indicating that MF successfully encapsulated CI Solvent Yellow 43 and that a core-shell structure was formed. The prepared MF encapsulated fluorescent dye dispersion was also applied to flat screen printing of cotton fabrics, and the colour properties and fastness properties (washing and rubbing fastness) of printed fabrics were studied. The results showed that the encapsulated CI Solvent Yellow 43 printed cotton fabric exhibited a higher chroma and fluorescence intensity than that printed with unencapsulated CI Solvent Yellow 43. Moreover, the washing and rubbing fastness of the encapsulated CI Solvent Yellow 43 printed fabric was improved. Note de contenu : - EXPERIMENTAL : Materials - Preparation of the thermochromic colorant - Characterisation - FTIR analysis - Colour coordinates - Differential scanning calorimetry analysis
- RESULTS AND DISCUSSION : The thermochromic mechanism - The switching temperature - The reversible propertyDOI : 10.1111/cote.12379 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12379 Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32323
in COLORATION TECHNOLOGY > Vol. 135, N° 2 (04/2019) . - p. 103-110[article]Réservation
Réserver ce documentThe effect of ultraviolet-curable water-borne polyurethane acrylate binder concentration on the printing performance of synthetic leather / Gülçin Baysal in COLORATION TECHNOLOGY, Vol. 135, N° 2 (04/2019)
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Titre : The effect of ultraviolet-curable water-borne polyurethane acrylate binder concentration on the printing performance of synthetic leather Type de document : texte imprimé Auteurs : Gülçin Baysal, Auteur ; Berdan Kalav, Auteur ; Burcak Karaguzel Kayaoglu, Auteur Année de publication : 2019 Article en page(s) : p. 111-120 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Colorimétrie
Copolymère uréthane acrylate
Cuir synthétique imprimé
Dureté (matériaux)
Formulation (Génie chimique)
Haut extrait sec
Liants
Photoréticulation
Polymères en émulsion
Rayonnement ultraviolet
Résistance à l'abrasion
Résistance au chocs
Revêtements en phase aqueuse
Sérigraphie
Solidité de la couleurIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : In this paper, synthetic leather samples were screen printed with pigmented pastes including two types of photoinitiators and three different concentrations of ultraviolet (UV)-curable water-borne polyurethane acrylate binder. The curing process was conducted under different combinations of lamps (gallium, mercury, gallium/mercury and gallium/gallium/mercury) at three power levels. Abrasion resistance, crock fastness, hardness and colour strength were investigated. Chemical changes in the clear and pigmented film structures because of UV curing were analysed by Fourier Transform-infrared spectroscopy measurements. In hardness measurements, the highest hardness values were obtained with clear and pigmented formulations which have the highest solid content (57%). In colour measurements, higher K/S values were obtained in samples printed with the formulation having a binder concentration of 46%. Wet crock fastness values improved as the energy level increased during curing, and the highest values were obtained with a formulation which had a binder concentration of 57%. Greater amounts of binder in the formulations and increased amounts of energy applied to the surface during curing increased the hardness value of the prints, thus better abrasion resistance was obtained. Overall results suggested that the highest hardness, crock fastness and abrasion resistance values were obtained with the formulation with a binder concentration of 57%. However, for ease of application, printing efficiency and colour strength, the formulation with a binder concentration of 46% is recommended for printing, and curing under consecutive passes with gallium and mercury lamps at 120 W/cm is proposed in terms of energy efficiency and printing performance. Note de contenu : - EXPERIMENTAL : Materials - Methods
- RESULTS AND DISCUSSION : UV curing and pendulum hardness measurements
- Fourier transform infrared (FTIR) spectroscopy - Colour measurements - Crock fastness of printed synthetic leather samples - Martindale abrasion resistance measurements of printed synthetic samplesDOI : 10.1111/cote.12382 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12382 Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32324
in COLORATION TECHNOLOGY > Vol. 135, N° 2 (04/2019) . - p. 111-120[article]Réservation
Réserver ce documentDyeing of cotton with the natural dye extracted from waste leaves of green tea (Camllia sinensis var. assamica) / Sukemi in COLORATION TECHNOLOGY, Vol. 135, N° 2 (04/2019)
[article]
Titre : Dyeing of cotton with the natural dye extracted from waste leaves of green tea (Camllia sinensis var. assamica) Type de document : texte imprimé Auteurs : Sukemi, Auteur ; Kornkanya Pratumyot, Auteur ; Choladda Srisuwannaket, Auteur ; Nakorn Niamnont, Auteur ; Withawat Mingvanish, Auteur Année de publication : 2019 Article en page(s) : p. 121-126 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Colorants végétaux
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).
Teinture -- Fibres textiles
Thé vert et constituantsIndex. décimale : 667.3 Teinture et impression des tissus Résumé : Due to an increase in the production of green tea, the amount of leaf waste has increased enormously, causing serious environmental problems. With regard to environmental awareness, the possibility of reusing the waste leaves of green tea as a low‐cost and abundantly available source of natural dye for dyeing cotton fibres was investigated. Natural dye powder from the waste leaves of green tea (NDPT) was successfully applied to dye cotton fibres without mordant by batch experiments. NDPT was obtained as a dark brown powder with a yield of 2.7 ± 0.5% w/w from dried waste leaves of green tea. The optimal conditions for dyeing NDPT onto cotton fibres were: pH of dye solution, 3 ; material to liquor ratio, 100:1 ; dyeing time, 180 min ; concentration of dye solution, 3.0 mg/ml ; and dyeing temperature, 100 °C. The colour of cotton fibres dyed with NDPT was observed to be dark brown. The adsorption data of NDPT on cotton fibres was best fitted with a Langmuir adsorption isotherm model with a correlation coefficient (R2) of 0.997. It is clear that there is a strong possibility of reusing the waste leaves of green tea as a low‐cost and abundantly available source of natural dye for dyeing cotton fibres. Note de contenu : - EXPERIMENTAL : Materials - Preparation of natural dye powder - Preparation of solutions of natural dye powder from the waste leaves of green tea - Phytochemical screening for natural dye powder from the waste leaves of green tea - Preparation of cotton fibres for dyeing with NDPT - General procedure for dyeing cotton fibres - The adsorption isotherm of cotton fibres dyed with NDPT
- RESULTS AND DISCUSSION : Characteristics and phytochemical screening of NDPT - Optimal conditions for dyeing cotton fibres with NDPT - Absorption isothermDOI : 10.1111/cote.12381 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12381 Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32325
in COLORATION TECHNOLOGY > Vol. 135, N° 2 (04/2019) . - p. 121-126[article]Réservation
Réserver ce documentIn situ fabric coloration with indigo synthesised in flow / Michael P. Haaf in COLORATION TECHNOLOGY, Vol. 135, N° 2 (04/2019)
[article]
Titre : In situ fabric coloration with indigo synthesised in flow Type de document : texte imprimé Auteurs : Michael P. Haaf, Auteur ; Katrina M. Piemonte, Auteur ; D. Tyler McQuade, Auteur ; Lucy Cotton, Auteur ; Richard S. Blackburn, Auteur Année de publication : 2019 Article en page(s) : p. 127-132 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Colorimétrie
Indigo
Pigments -- Synthèse
Résistance au lavage
Spectrométrie infrarouge
Teinture -- Fibres textiles
Teinture -- Fibres textiles synthétiquesIndex. décimale : 667.3 Teinture et impression des tissus Résumé : Indigo (CI Vat Blue 1) is a water-insoluble pigment exhibiting no affinity for fibres and must be chemically reduced in basic solution to form the water-soluble, alkaline leucoindigo (CI Reduced Vat Blue 1), in order to exhibit substantivity for fibres. Typical vat dyeing processes are time- and resource-intensive, and hazardous by-products are formed, primarily through the use of reducing agents. We describe a method for synthesising indigo in a flow reactor that allows for application of dye precursors to fibres, milliseconds before the reaction completes. The soluble precursors soak into the cotton fabric just prior to the precipitation of the insoluble indigo, effectively providing in situ coloration, without the need for a traditional redox dyebath. The reaction may be coupled with a propellant, an adaptation that allows for a sprayable form of indigo. In situ coloration with Tyrian purple (6,6'-dibromoindigo ; CI Natural Violet 1) was also demonstrated using the flow chemistry method. This research provides compelling proof of concept, but we acknowledge that the process is in its infancy and needs further development to reach a stage where it can compete commercially with current technology. Note de contenu : - Materials
- In-flow synthesis of indigo in microfluidic device
- Infrared spectroscopy
- Colour measurement
- Wash fastness testingDOI : 10.1111/cote.12383 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12383 Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32326
in COLORATION TECHNOLOGY > Vol. 135, N° 2 (04/2019) . - p. 127-132[article]Réservation
Réserver ce documentColour and gloss properties of pigment-printed synthetic leather using an ultraviolet-curable water-borne polyurethane acrylate binder and two photoinitiators at different ratios / Gülçin Baysal in COLORATION TECHNOLOGY, Vol. 135, N° 2 (04/2019)
[article]
Titre : Colour and gloss properties of pigment-printed synthetic leather using an ultraviolet-curable water-borne polyurethane acrylate binder and two photoinitiators at different ratios Type de document : texte imprimé Auteurs : Gülçin Baysal, Auteur ; Berdan Kalav, Auteur ; Burcak Karaguzel Kayaoglu, Auteur Année de publication : 2019 Article en page(s) : p. 133-142 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Brillance (optique)
Colorimétrie
Copolymère uréthane acrylate
Copolymères en émulsion
Cuir synthétique imprimé
Fourier, Spectroscopie infrarouge à transformée de
Liants
Photoamorceurs (chimie)
Pigments
Rayonnement ultravioletIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : This study reports on the colour and gloss properties of pigment-printed polyurethane-based synthetic leather using an ultraviolet (UV)-curable water-borne polyurethane acrylate binder and two types of photoinitiators (Omnirad 819 DW and Omnirad 500) at different ratios. The UV curing of printed synthetic leather samples was conducted with gallium and mercury lamps, either singly or in combination, at three different power levels. Chemical changes in the cured films because of the polymerisation of the UV-curing process were analysed by Fourier Transform-infrared spectroscopy, which showed that the polymerisation reaction occurred after UV curing in both the clear and in the pigmented films. The Omnirad 500 photoinitiator is more effective in surface curing and the Omnirad 819 DW photoinitiator is more effective in deep curing. The Omnirad 500 photoinitiator caused the gloss values to drop significantly, especially in the formulation including both photoinitiators, Omnirad 819 DW and Omnirad 500, at a 1:2 ratio, respectively. In the formulation including a higher ratio of the Omnirad 819 DW photoinitiator, higher gloss values were obtained compared with the formulation including a higher ratio of the Omnirad 500 photoinitiator. Considering all the results, the highest gloss value of 20.96 was obtained with samples printed with the formulation of the two photoinitiators at an equal ratio (1:1) cured under a gallium/mercury lamp combination at a power level of 90 W/cm. Moreover, the highest K/S value of 10.86 was obtained with samples printed with the formulation of the two photoinitiators at an equal ratio cured under the gallium lamp at 90 W/cm. Note de contenu : - EXPERIMENTAL : Materials - Methods
- RESULTS AND DISCUSSION : UV curing and Fourier Transform-Infrared spectroscopy - Gloss measurements - Colour measurementsDOI : 10.1111/cote.12386 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12386 Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32327
in COLORATION TECHNOLOGY > Vol. 135, N° 2 (04/2019) . - p. 133-142[article]Réservation
Réserver ce documentPolydopamine-coated silk yarn for improving the light fastness of natural dyes / Sanhanut Kesornsit in COLORATION TECHNOLOGY, Vol. 135, N° 2 (04/2019)
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Titre : Polydopamine-coated silk yarn for improving the light fastness of natural dyes Type de document : texte imprimé Auteurs : Sanhanut Kesornsit, Auteur ; Phichet Jitjankarn, Auteur ; Warayuth Sajomsang, Auteur ; Pattarapond Gonil, Auteur ; John B. Bremner, Auteur ; Montra Chairat, Auteur Année de publication : 2019 Article en page(s) : p. 143-151 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Caractérisation
Colorants végétaux
Enduction textile
Granulométrie
Photostabilité
Polydopamine
Soie et constituants
Teinture -- Fibres textilesIndex. décimale : 667.3 Teinture et impression des tissus Résumé : One of the problems occasionally associated with the use of natural dyes in the dyeing of silk is the susceptibility of the dyed yarn to fading in light. While a number of approaches have been used to address this problem, the use of polydopamine (PDA), a known agent with photo‐protective properties, has not been assessed previously. In this study, silk was pretreated with nano‐particulate PDA formed in situ by oxidation of a dopamine solution, then dyed with lac dye or annatto dye as model natural dyes. Photofading rates were significantly reduced in the case of annatto‐dyed, PDA‐coated silk relative to uncoated silk, while wash fastness was unaffected and remained only moderately good. In contrast, no significant change was seen in photofading rates with treated or untreated lac‐dyed silk, and wash fastness was also unaffected. The PDA did not adversely affect resultant colour values if the concentration of the dopamine precursor was kept low. When this was done, acceptable colours were obtained in the dyed silk. Further investigation is warranted of PDA as a photofading protectant and mordant with other natural dyes on silk and other fibres. Note de contenu : - EXPERIMENTAL : Materials and chemicals - Instruments - Preparation of PDA-coated silk - Average particle size and characterisation of the PDA - ATR-FTIR analysis - Dye preparation and dyeing of the PDA-coated silk yarn with lac and annatto dyes - Colour measurement and fastness testing - Light exposure
- RESULTS AND DISCUSSION : PDA characterisation - Preparation and characterisation of the PDA-coated silk yarn - Fading rate curves of the PDA-coated silk yarn - Fading rate curves of lac and annatto dyes - Improving the light fastness of annatto and lac dyes by coating silk yarn withy PDADOI : 10.1111/cote.12390 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12390 Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32328
in COLORATION TECHNOLOGY > Vol. 135, N° 2 (04/2019) . - p. 143-151[article]Réservation
Réserver ce documentA semi-aza-crown-based chemosensor for colorimetric detection of iron(III) and iron(II) in aqueous media with large bathochromic shift in COLORATION TECHNOLOGY, Vol. 135, N° 2 (04/2019)
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Titre : A semi-aza-crown-based chemosensor for colorimetric detection of iron(III) and iron(II) in aqueous media with large bathochromic shift Type de document : texte imprimé Année de publication : 2019 Article en page(s) : p. 152-159 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Capteurs chimiques
Colorimétrie
Fer
Produits chimiques -- Détection
Solutions aqueuses (chimie)Index. décimale : 667.2 Colorants et pigments Résumé : A colorimetric chemosensor, EDDAN (1,1'-((1E,11E)-5,8-dioxa-2,11-diazadodeca-1,11-diene-1,12-diyl)bis(naphthalen-2-ol)), based on a semi-aza-crown structure, was designed and synthesised to sense iron(III) and iron(II). EDDAN showed a unique colour change in the presence of either iron(III) or iron(II), turning from pale yellow to deep purple with large bathochromic shifts. The detection limits of iron(III) and iron(II) were 2.70 and 3.43 µm, respectively. EDDAN displayed a high selectivity for iron ions in the presence of other metal cations except copper(II). In addition, EDDAN showed excellent reversibility by using ethylenediaminetetraacetic acid. Moreover, EDDAN was applied to test strips as well. Based on ultraviolet-visible titrations, Job plots, electron paramagnetic resonance study and electrospray ionisation mass spectrometry analyses, a mechanism for the sensing of iron(III) and iron(II) was also proposed. Note de contenu : - EXPERIMENTAL : General information - UV-vis titration - Job plot analysis - Competition tests - Reversible test - Test strip application
- RESULTS AND DISCUSSION : The colorimetric sensing property of EDDAN to iron(III) and iron(II)DOI : 10.1111/cote.12387 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12387 Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32329
in COLORATION TECHNOLOGY > Vol. 135, N° 2 (04/2019) . - p. 152-159[article]Réservation
Réserver ce documentEffects of the side chain density of polycarboxylate dispersants on dye dispersion properties / Hamid Gharanjig in COLORATION TECHNOLOGY, Vol. 135, N° 2 (04/2019)
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Titre : Effects of the side chain density of polycarboxylate dispersants on dye dispersion properties Type de document : texte imprimé Auteurs : Hamid Gharanjig, Auteur ; Kamaladin Gharanjig, Auteur ; Alireza Khosravi, Auteur Année de publication : 2019 Article en page(s) : p. 160-168 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Agents dispersants (chimie)
Agents dispersants (chimie) -- Synthèse
Caractérisation
Colorants -- Solubilité
Dispersions et suspensions
Dispersions et suspensions -- Stabilité
Granulométrie
Polycarboxylates
Polyesters
Polymères en émulsion
Polymères ramifiés
Spectrophotométrie
Stabilité thermique
Teinture -- Fibres textiles synthétiques
TurbidimétrieLa turbidimétrie est la mesure du degré de turbidité d'une suspension. Elle est déterminée grâce à un système optique, en général un spectrophotomètre classique, qui mesure la diminution, due à l'absorbance, de l'intensité d'un rayon lumineux de longueur d'onde connue traversant la suspension. La turbidimétrie est utilisée en complément à la néphélométrie qui se base plutôt sur la diminution de l'intensité par diffusion de la lumière.Index. décimale : 667.2 Colorants et pigments Résumé : Comb‐like polycarboxylates were synthesised by copolymerisation of methacrylic acid and nonylphenol polyethylene glycol methacrylate ester, and can be used as dye dispersants. In order to achieve good dispersive ability, three polycarboxylates were synthesised, each having a different side chain density. The side chain density of polymers was controlled by different ratios of monomers in the copolymerisation process. Acidic polymers were neutralised using sodium hydroxide. These polymers exhibit good dispersing performance, such that carboxylate groups are adsorbed onto the dye particle surface and the side chains enable the formation of a thick layer, thus providing the steric hindrance effect. Improvement of dye dissolution in the presence of polycarboxylates was studied. Polymers with a lower side chain density demonstrated a higher dye dissolution in water, which could be as a result of more effective adsorption of dispersant on the dye surface (CI Disperse Blue 79). The dyeing performance of the prepared dye dispersions on polyester was investigated. Spectrophotometric analysis of dyed fabrics using synthesised polycarboxylates demonstrates that there should be an optimum side chain density of polymer in order to control both dye solubility and dispersive ability. The result of turbidimetry and particle size analysis have proven this phenomenon. A comb‐like polycarboxylate with optimum side chain density was a better dye dispersant compared with a commercial sodium naphthalene sulphonate compound, as a result of its better heat stability. Note de contenu : - EXPERIMENTAL : Chemicals and apparatus - Synthesis of dispersants - Solubility of CI Disperse Blue 79 - Optimisation of dispersant concentration - Dye dispersion stability - Measurement of build-up - Investigation of the heat stability of dye dispersions
- RESULTS AND DISCUSSION : Characterisation - Dye solubility - Effect of dispersant concentration on dyeing - Dye dispersion stability - Effect of polycarboxylates on build-up - Effect of polycarboxylates on the heat stability of dye dispersionsDOI : 10.1111/cote.12391 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12391 Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32330
in COLORATION TECHNOLOGY > Vol. 135, N° 2 (04/2019) . - p. 160-168[article]Réservation
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