Enhancing the wash fastness of disperse dyes on wool with oxidants / Steven J. McNeil in COLORATION TECHNOLOGY, Vol. 136, N° 3 (06/2020)  

[article]  inCOLORATION TECHNOLOGY > Vol. 136, N° 3 (06/2020) . - p. 231-243 Titre : Enhancing the wash fastness of disperse dyes on wool with oxidants Type de document : texte imprimé Auteurs : Steven J. McNeil, Auteur ; Larissa I. Zaitseva, Auteur Année de publication : 2020 Article en page(s) : p. 231-243 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Agents de blanchiment Colorants dispersés Catégorie de colorants très peu solubles dans l'eau, utilisés à l'origine comme colorants pour l'acétate, et qui généralement sont appliqués sous forme de suspensions aqueuses de faible concentration.Les colorants dispersés sont largement utilisés dans la teinture de la plupart des fibres manufacturées, surtout le polyester. Laine Oxydants Peroxyde d'hydrogène Le peroxyde d'hydrogène (H2O2), communément appelé eau oxygénée ou encore perhydrol (appellation industrielle), est un composé chimique liquide et visqueux, aux puissantes propriétés oxydantes (il est aussi réducteur). C'est donc un agent blanchissant efficace qui sert de désinfectant et (à haute concentration) d'oxydant ou monergol dans les fusées spatiales. Persulfate d'ammonium Polyesters Résistance au lavage Teinture -- Fibres textiles Index. décimale : 667.3 Teinture et impression des tissus Résumé : Disperse dyes are not currently applied to wool commercially, in large part because of inadequate wash fastness, but they do have potential, especially for wool-polyester blends. In this study, for the first time hydrogen peroxide was investigated to increase the wash fastness of disperse dyes on wool. In the absence of oxidants, 10 disperse dyes from seven classes imparted colours with a range of depths (K /S 2-26) with wash fastness (grey scale ratings for colour change) grades of 3 to 4-5. Hydrogen peroxide had only small effects on colours and gave only small enhancements to wash fastness, which were limited to anthraquinone, nitrodiphenylamine, disazo and coumarin dyes. The bleach activators Prestogen W and citric acid enhanced the bleaching effect of hydrogen peroxide but did not assist with raising wash fastness. Hydrogen peroxide in post-dyeing scouring made the dyeings brighter but did not significantly enhance wash fastness. Ammonium persulphate, which was included for benchmarking with earlier studies, yellowed the wool and decomposed some dyes. This study extends the range of dye classes whose wash fastness on wool can be improved by ammonium persulphate to now include diazo, coumarin and methine, and confirms that oxidants/free radical initiators have potential for enabling the disperse dyeing of wool. Note de contenu : - EXPERIMENTAL : Materials - Methods - Measurements - RESULTS - DISCUSSION : Effect of concentration of oxidant during dye exhaustion - Dyeing in the presence of activated HP - HP in the post-dyeing scouring bath - Six classes of disperse dye with single levels of HP and APS DOI : https://doi.org/10.1111/cote.12453 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12453 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34296 [article]

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In-situ modification of graphene oxide by insoluble sulfur and application for nitrole butadiene rubber / S.-B. Chen in INTERNATIONAL POLYMER PROCESSING, Vol. XXXV, N° 2 (05/2020)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXXV, N° 2 (05/2020) . - p. 221-228 Titre : In-situ modification of graphene oxide by insoluble sulfur and application for nitrole butadiene rubber Type de document : texte imprimé Auteurs : S.-B. Chen, Auteur ; T.-X. Li, Auteur ; L.-H. Wan, Auteur ; X. Huang, Auteur ; S.-W. Cai, Auteur ; Xianru He, Auteur Année de publication : 2020 Article en page(s) : p. 221-228 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Amorceurs (chimie) Caoutchouc nitrile-butadiène Caractérisation Composites -- Propriétés mécaniques Matériaux -- Modifications chimiques Oxyde de graphène Persulfate d'ammonium Soufre Stabilisants (chimie) Index. décimale : 668.4 Plastiques, vinyles Résumé : Insoluble sulfur (IS) is prepared at low temperature with graphene oxide (GO) as stabilizer and ammonium persulfate as initiator. The FTIR and Raman patterns show that the non-conjugate double bond of GO can couple to the long chain free radicals of IS. The TGA and EDS results show that the mass fraction of IS is 79.75 wt% in particles by refluxing method, much higher than that in particles by hydrothermal method, when the mass ratio in reactants of GO to sulfur was 3: 1. Under constant content of sulfur, the tensile stress and elongation at break of NBR/GO-S(h) and NBR/GO-S(r) composites are higher than those of NBR/Reduced GO composites with the addition of 3 phr GO-S(h), GO-S(r) and Reduced GO particles into NBR. It can provide a new technology for the preparation of IS with lower temperature, little energy consumption and less environmental pollution. It is also a new method for the modification and application of GO in rubber. Note de contenu : - EXPERIMENTAL : Materials - Preparation of GO, GO-S(h) and GO-S(r) - Preparation of NBR/GO-S(h) and NBR/GO-S(r) compsites - INSTRUMENTATION - RESULTS AND DISCUSSION : Structure characterization of GO-S composites - The conversion rate of sulfur - Application of GO-S(h) and GO-S(r) particles in NBR DOI : https://doi.org/10.3139/217.3910 En ligne : https://drive.google.com/file/d/1vTz1sw3uM_b9wTKHrGrg1XnesfHmAl_Y/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34016 [article]

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Preparation and characterization of a stable core-shell latex with VAE in the core / Shi Luo in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVII, N° 9 (09/2012)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CVII, N° 9 (09/2012) . - p. 286-291 Titre : Preparation and characterization of a stable core-shell latex with VAE in the core Type de document : texte imprimé Auteurs : Shi Luo, Auteur ; Bailing Liu, Auteur Année de publication : 2012 Article en page(s) : p. 286-291 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Acrylate de butyle Caractérisation Copolymère éthylène acétate de vinyle Core-Shell Fourier, Spectroscopie infrarouge à transformée de Latex Lumière -- Diffusion Microscopie électronique en transmission Persulfate d'ammonium Polymérisation en émulsion Styrène Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : A core-shell latex containing Butyl Acrylate (BA) and Styrene (St) in shell, and Vinyl Acetate-Ethylene (VAE) in core was successfully prepared by seeded emulsion polymerization with water as the reaction medium. Several key elements related to the polymerization, including core/shell ratio, BA/St ratio and Ammonium persulfate (APS) dosages were investigated in details. Accordingly, an optimal reaction condition was developed. The synthesized l,atex particles were characterized by Transmission electron microscopy (TEM) and Dynamic light scattering (DLS). The clear core-shell structure and chemical components of the core-shell latex particles were determined by TEM and Fourier transform infrared (FTIR) spectrometry, respectively. In addition, the comparisons between the core-shell latex and VAE latex were made. The experimental results indicated that the developed core-shell latex produced improved leather related properties for thermal stability, water resistance and adhesion. Note de contenu : - MATERIALS - SEEDED EMULSION POLYMERIZATION - CHARACTERIZATION : Solid content and conversion - Stability of the emulsion - Water absorption ratio - Thermogravimetric analysis - Adhesive strength - Infrared spectra - Particle size and morphology - SYNTHESIS CONDITIONS OF THE CORE/SHELL : Core/shell ratio - BA/St ratio - APS dosage - FTIR SPECTRA - LATEX PARTICLE MORPHOLOGY OF CORE-SHELL EMULSION - THERMAL STABILITY ANALYSIS - WATER ABSORPTION OF EMULSION FILMS - ADHESION PERFORMANCE OF EMULSIONS - TABLE I : Recipes for the preparation of core-shell (BA-St-VAE) by seeded emulsion polymerization with various core/shell ratio - TABLE II : Recipes for the preparation of core-shell (BA-St-VAE) by seeded emulsion polymerization with various BA/St ratio - TABLE III : Recipes for the preparation of core-shell (BA-St-VAE) by seeded emulsion polymerization with various content of APS - TABLE IV : The latex stability with various core/shell ratio - TABLE V : The emulsion stability with various BA/St ratio - TABLE VI : The latex stability and polymerization conversion with various APS dosage - TABLE VII : The water absorption ratio and contact angle of latex films - TABLE VIII : The adhesive strength of emulsions En ligne : https://drive.google.com/file/d/1pzeVlxUmYVjPxtCANlg-jhi6qjpX1U-T/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=16059 [article]

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