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Quantitative structure–property relationship modelling for photoreduction-fast azo dyes on a nylon substrate : a methodology for thermochemical analysis of the photocleavage of azo dyes using the RM1 semi-empirical molecular orbital method / Yasuyo Okada in COLORATION TECHNOLOGY, Vol. 133, N° 2 (04/2017)  

[article]  inCOLORATION TECHNOLOGY > Vol. 133, N° 2 (04/2017) . - p. 98-115 Titre : Quantitative structure–property relationship modelling for photoreduction-fast azo dyes on a nylon substrate : a methodology for thermochemical analysis of the photocleavage of azo dyes using the RM1 semi-empirical molecular orbital method Type de document : texte imprimé Auteurs : Yasuyo Okada, Auteur ; Zenzo Morita, Auteur Année de publication : 2017 Article en page(s) : p. 98-115 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Colorants azoïques Colorants réactifs -- Détérioration Décoloration Orbitales moléculaires Photochimie Polyamide 66 Relations structure-propriétés Teinture -- Fibres textiles synthétiques Thermochimie Index. décimale : 667.3 Teinture et impression des tissus Résumé : The rates of fading of 18 reactive azo dyes on polyamide fabrics and films upon exposure to a carbon arc in air have been determined from the initial slopes. The rates have been thermochemically analysed by calculating the heats of formation of the reactants, intermediates, and products by chemical equations describing (1) the second-order disproportionation (redox reaction) between the photoinduced hydrazinyl radicals and (2) the intramolecular H-transfer (self-decomposition) of the radicals, using the RM1 semi-empirical molecular orbital method. The rates of azo cleavage (or reductive fading) were studied to correlate the molecular structures with three molecular descriptors: (a) the heats of reaction for two reaction pathways, (b) the thermodynamic stability of the photoinduced hydrazinyl radicals, and (c) the quantum yields of generation. The possibility of structure optimisation of the examined azo dyes is discussed from the perspectives of (a) and (b). The light fastness of several previously reported substituted phenylazophenol (model) dyes on a polyamide substrate has been analysed by the same procedure. Two of the latter dyes exhibit typical photoreduction-fast properties, which determine the threshold ?rH°(gas) value of the N11-hydrazinyl dye radical for (1), indicating that the chemical structures of azo dyes may, in principle, be modified to include reduction-fast azo groups. The current state of reactive azo dyes is considerably below the level required to achieve reduction-fast dye. The chemical structures of current reactive azo dyes appear not to have been optimised on the basis of the molecular descriptors (a) and (b), and only insufficiently on the basis of (c). Note de contenu : - EXPERIMENTS AND MO CALCULATION : Dyes used - Materials : dyeing and exposure - MO calculations - RESULTS AND DISCUSSION : Photochemical reactions of photoinduced (MHN) radicals - Thermochemical analysis based on the reactions of photoinduced (MHN) radicals - Extension of the structure range to substituted phenylazo-p-phenol dyes - Possibility of innovating reduction-fast azo dyes by optimising several factors DOI : 10.1111/cote.12265 En ligne : https://drive.google.com/file/d/1WHzXJ7HA1Q_vbZqT39915HMwx6mTJOfI/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28223 [article]

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Some properties of a thickener for preparing inkjet printing ink for nylon carpet / Chang E. Zhou in COLORATION TECHNOLOGY, Vol. 133, N° 2 (04/2017)  

[article]  inCOLORATION TECHNOLOGY > Vol. 133, N° 2 (04/2017) . - p. 116-121 Titre : Some properties of a thickener for preparing inkjet printing ink for nylon carpet Type de document : texte imprimé Auteurs : Chang E. Zhou, Auteur ; Qing Zhang, Auteur ; Chi-Wai Kan, Auteur Année de publication : 2017 Article en page(s) : p. 116-121 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Durée de stockage Electrolytes Encre jet d'encre Epaississants Impression jet d'encre Polyacrylates Polyamide 66 Tapis Tension superficielle Index. décimale : 667.3 Teinture et impression des tissus Résumé : The properties of a thickener for nylon carpet inkjet printing are presented in this work. A water-based ink was prepared from polyacrylate-based thickener. The physical and chemical properties of the polyacrylate-based thickener used for preparing the inkjet printing ink, as well as its printing effects on carpet, were investigated. Before printing, the properties of the ink, including its surface tension, electrolyte resistance, storage stability, and percentage removal, were investigated. After printing, the efficiency of coloration of printed carpet and the fastness of printed carpet were studied. The results concerning the surface tension and percentage removal of printing ink show that the polyacrylate-based thickener printing ink is suitable for nylon carpet inkjet printing. Meanwhile, its storage stability and electrolyte resistance make it suitable for printing. The efficiency of coloration of printed carpet and the fastness of printed carpet satisfy the requirements of application at appropriate ink concentration and viscosity. Note de contenu : - EXPERIMENTAL : Materials - Preparation of printing ink with different thickener concentrations - Method for inkjet printing onto nylon carpet - Surface tension - Effect of electrolyte - Storage stability - Efficiency of coloration of printed carpet - Fastness - Washing-off of thickener - RESULTS AND DISCUSSION : Surface tension - Effect of electrolyte - Storage stability - Efficiency of coloration of printed carpet - Fastness of printed carpet - Washing-off of thickener DOI : 10.1111/cote.12262 En ligne : https://drive.google.com/file/d/1K59wB8Uq0Sn2MOgzUZUpCs9EBi3Rj9h4/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28224 [article]

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Synthesis, photophysical properties, and application of optical brighteners based on stilbene-oxadiazole derivatives / Mervat El-Sedik in COLORATION TECHNOLOGY, Vol. 133, N° 2 (04/2017)  

[article]  inCOLORATION TECHNOLOGY > Vol. 133, N° 2 (04/2017) . - p. 122-127 Titre : Synthesis, photophysical properties, and application of optical brighteners based on stilbene-oxadiazole derivatives Type de document : texte imprimé Auteurs : Mervat El-Sedik, Auteur ; Tarek Aysha, Auteur ; Yehya A. Youssef, Auteur Année de publication : 2017 Article en page(s) : p. 122-127 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Azurants optiques Chimie textile Composés organiques -- Synthèse Polyamide 6 Polyesters Textiles et tissus synthétiques Index. décimale : 667.3 Teinture et impression des tissus Résumé : A series of symmetrical optical brighteners based on stilbene-oxadiazole derivatives were prepared by the simple synthetic route of a condensation reaction between 4,4?-dicarboxystilbene and N,N?-carbonyldiimidazole reagent, forming stilbene 4,4?-ethene-1,2-diyldibenzohydrazide as a key intermediate. The obtained compounds were characterised by analysis of nuclear magnetic resonance, mass spectrometry, and elemental analysis data. The absorption maximum wavelength, fluorescence emission wavelength, and fluorescence quantum yield were measured in N,N-dimethylformamide solution at room temperature, and the fluorescence properties of the prepared compounds in the solid state were observed and measured. The compounds exhibited bluish and greenish fluorescence emission, with the fluorescence quantum yield in the range 0.2–0.8; the effects of substituents on the emission spectra of these compounds were interpreted. The prepared compounds were applied as optical brighteners to polyester and polyamide-6 fabrics at various concentrations, and their CIE whiteness index and fastness properties were studied. Note de contenu : - EXPERIMENTAL : Materials - Equipment - Synthesis - FWA application procedure - RESULTS AND DISCUSSION : Synthesis - The absorption and fluorescence properties - The application properties DOI : 10.1111/cote.12258 En ligne : https://drive.google.com/file/d/1WxpLozF2mqTAtX8UuSNMKhPzWMuDFATz/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28225 [article]

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Illumination compensation in textile colour constancy, based on an improved least-squares support vector regression and an improved GM(1,1) model of grey theory / Jian-xin Zhang in COLORATION TECHNOLOGY, Vol. 133, N° 2 (04/2017)  

[article]  inCOLORATION TECHNOLOGY > Vol. 133, N° 2 (04/2017) . - p. 128-134 Titre : Illumination compensation in textile colour constancy, based on an improved least-squares support vector regression and an improved GM(1,1) model of grey theory Type de document : texte imprimé Auteurs : Jian-xin Zhang, Auteur ; Pan Zhang, Auteur ; Xiao-liang Wu, Auteur ; Zhi-yu Zhou, Auteur ; Chong Yang, Auteur Année de publication : 2017 Article en page(s) : p. 128-134 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Algorithmes Textiles et tissus vision des couleurs Index. décimale : 667.3 Teinture et impression des tissus Résumé : In many colour-related fields, such as textile colour measurement systems based on computer vision as well as dyestuff synthesis, colour constancy with illumination variation is a key problem to be solved. A new algorithm of illumination compensation for colour constancy for textured textiles is proposed in this paper, combining an improved least-squares support vector regression (LSSVR) and an improved GM(1,1) model of grey theory. The LSSVR algorithm was improved by determining the error limitation according to the distance between a standard sample and a test sample, while the improved GM(1,1) model used the average value of the sequence x^(1)(1)-x^(1)(n) as the initial iteration value. The disadvantage of LSSVR, that it easily falls into global optimisation, can be compensated for by the local optimisation capacity of the GM(1,1) model. Experimental results show that the algorithm of this paper is very stable and provides good illumination compensation, whereby the time complexity of compensation is reduced by repeatedly processing fractional data with the LSSVR algorithm, and the prediction accuracy is improved by combining the improved GM(1,1) model and the LSSVR algorithm. Note de contenu : - ILLUMINATION COMPENSATION MODEL WITH IMPROVED LSSVR AND GM(1,1) : Improved LSSVR algorithm - GM(1,1) model with initial value as average of x^(1)(1)-x^(1)(n) - ILLUMINATION COMPENSATION : Colour space - Illumination compensation procedure - EXPERIMENTS AND DISCUSSION : Comparison of the LSSVR + GM(1,1) algorithm with the SSR and BP_Adaboost algorithms - Evaluation of the LSSVR+GM(1,1) algorithm DOI : 10.1111/cote.12243 En ligne : https://drive.google.com/file/d/1_uIjBeBakHbXbUrT0Y7yuufOr5nvev-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=28226 [article]

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3,3'-Dinitrophenolsulphonephthalein : an acid–base indicator dye with unusual properties / Nicolay O. Mchedlov-Petrossyan in COLORATION TECHNOLOGY, Vol. 133, N° 2 (04/2017)  

[article]  inCOLORATION TECHNOLOGY > Vol. 133, N° 2 (04/2017) . - p. 135-144 Titre : 3,3'-Dinitrophenolsulphonephthalein : an acid–base indicator dye with unusual properties Type de document : texte imprimé Auteurs : Nicolay O. Mchedlov-Petrossyan, Auteur ; Anna N. Laguta, Auteur ; Sergey V. Shekhovtsov, Auteur ; Sergey V. Eltsov, Auteur ; Tatyana A. Cheipesh, Auteur ; Irina V. Omelchenko, Auteur ; Oleg V. Shishkin, Auteur Année de publication : 2017 Article en page(s) : p. 135-144 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cellules Chromatographie en phase liquide à hautes performances Colorants -- Synthèse Etude in vitro Photochimie Spectrométrie de masse Structure moléculaire Thiols Index. décimale : 667.2 Colorants et pigments Résumé : This paper is devoted to the phenolsulphonephthalein nitro derivative 3,3'-dinitrophenolsulphonephthalein, also called nitrophenol violet (NPV). The neutral molecular form, H2R, was isolated as a sultonic tautomer, and an X-ray crystal structure analysis was carried out. UV-vis absorption spectra in methanol, DMSO, acetonitrile, and water at different pH values were ascribed to the molecular and anionic (H2R, HR-, and R2-) species. Whereas the pKa values of this acid–base indicator (HR- urn:x-wiley:14723581:media:cote12254:cote12254-math-0001 R2- + H+) in water and DMSO are close to those of 3,3',5,5'-tetrabromophenolsulphonephthalein (or bromophenol blue), replacing the four Br atoms with two NO2 groups results in a pronounced tendency to carbinol formation. In weakly acidic aqueous media, the HR- anion slowly converts into the colourless carbinol H2ROH-. The latter is transformed to the orange carbocation only in concentrated (70-94 wt%) sulphuric acid. The formation of H2ROH- is atypical for the common sulphonephthalein indicators and should be ascribed to the enhanced positive charge density on the nodal carbon atom. The reaction mechanism and kinetic equation explaining this pH-dependent process are proposed, in addition to a kinetic study of the common process R2- + HO- -> ROH3- in the alkaline region. The numerical characterisation of the protolytic processes obtained for NPV is also helpful in gaining a better understanding of the properties of previously studied 3,3',5,5'-tetranitrophenolsulphonephthalein, which is much less accessible for a quantitative description. Note de contenu : - EXPERIMENTAL : General - Synthesis - Photochemical experiments - Studies of the spectroscopic response of the dyes to thiols - UPLC/MS analyses - Determination of cell viability and studies of the response to thiols in living cells - RESULTS AND DISCUSSION : Synthesis and spectroscopic studies - Studies of the spectroscopic response to thiols - UPLC and mass spectral analyses of products formed in the reaction with L-Cys - Cell viability and response to thiols in vitro DOI : 10.1111/cote.12254 En ligne : https://drive.google.com/file/d/1korHDoZ5IQTDhl4kyBlpyXX3OPlzMqdG/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28227 [article]

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Dyes derived from benzo[a]phenoxazine – synthesis, spectroscopic properties, and potential application as sensors for l-cysteine / Aleksandra Grzelkowska in COLORATION TECHNOLOGY, Vol. 133, N° 2 (04/2017)  

[article]  inCOLORATION TECHNOLOGY > Vol. 133, N° 2 (04/2017) . - p. 145-157 Titre : Dyes derived from benzo[a]phenoxazine – synthesis, spectroscopic properties, and potential application as sensors for l-cysteine Type de document : texte imprimé Auteurs : Aleksandra Grzelkowska, Auteur ; Jolanta Kolinska, Auteur ; Malgorzata Zaklos‐Szyda, Auteur ; Radoslaw Michalski, Auteur ; Jolanta Sokolowska, Auteur Année de publication : 2017 Article en page(s) : p. 145-157 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Chromatographie en phase liquide à hautes performances Colorants -- Synthèse Etude in vitro Photochimie Spectrométrie de masse Thiols Toxicologie cellulaire Index. décimale : 667.2 Colorants et pigments Résumé : Several benzo[a]phenoxazine dyes containing a maleimide moiety have been synthesised and characterised by proton nuclear magnetic resonance spectroscopy and mass spectrometry. The spectroscopic properties, such as absorption and emission spectra, of these dyes – 9-maleimido-5H-benzo[a]phenoxazin-5-one (7a), 6-chloro-9-maleimido-5H-benzo[a]phenoxazin-5-one (7b), and 6-bromo-9-maleimido-5H-benzo[a]phenoxazin-5-one (7c) – were examined. These compounds were evaluated as potential fluorescent and colorimetric probes for the detection of biothiols. Results show that the studied compounds exhibit colorimetric and fluorescent responses to l-cysteine at pH 7.4. In the presence of l-cysteine, the fluorescence intensity of synthesised dyes is greatly enhanced. The addition of l-cysteine to solutions of dyes 7a to 7c also results in red shifts of their absorption bands. The cytotoxic effect of tested dyes 7a to 7c against human neuroblastoma cells (SH-SY5Y) was determined by MTT assay. The fluorescent response of these compounds to thiols SH-SY5Y was examined. The results show that the tested compounds exhibit fluorescent response in this cell line, and the benzo[a]phenoxazine dyes substituted in the 6-position with a halogen (7b and 7c) are less toxic against cells under experimental conditions than their unsubstituted analogue (7a). Note de contenu : - EXPERIMENTAL : General - Synthesis - Photochemical experiments - Studies of the spectroscopic response of the dyes to thiols - UPLC/MS - Determination of cell viability and studies of the response to thiols in living cells - RESULTS AND DISCUSSION : Synthesis and spectroscopic studies - Studies of the spectroscopic response to thiols - UPLC and mass spectral analyses of products formed in the reaction with L-Cys - Cell viability and response to thiols in vitro DOI : 10.1111/cote.12261 En ligne : https://drive.google.com/file/d/15o-TDla3f6bzE6z4zT7QuFvXlTiic_rz/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28228 [article]

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Synthesis of yellow pyridonylazo colorants and their application in dye-pigment hybrid colour filters for liquid crystal display / Jong Min Park in COLORATION TECHNOLOGY, Vol. 133, N° 2 (04/2017)  

[article]  inCOLORATION TECHNOLOGY > Vol. 133, N° 2 (04/2017) . - p. 158-164 Titre : Synthesis of yellow pyridonylazo colorants and their application in dye-pigment hybrid colour filters for liquid crystal display Type de document : texte imprimé Auteurs : Jong Min Park, Auteur ; Chang Young Jung, Auteur ; Wang Yao, Auteur ; Cheol Jun Song, Auteur ; Jae Yun Jaung, Auteur Année de publication : 2017 Article en page(s) : p. 158-164 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Colorants -- Propriétés optiques Colorants -- Solubilité Colorants -- Synthèse Colorants azoïques Cristaux liquides Encre Filtres Jaune Résonance magnétique nucléaire Stabilité thermique Thermogravimétrie Index. décimale : 667.2 Colorants et pigments Résumé : Nine yellow azo dyes were designed and synthesised by using different diazo components and pyridonyl coupling components for application in dye–pigment hybrid colour filters for liquid crystal displays. The synthesised dyes were characterised by proton nuclear magnetic resonance and elemental analysis. The thermal stability was examined by thermogravimetric analysis, and solubility was estimated in industrial solvents such as N-methyl-2-pyrrolidone and propylene glycol methyl ether acetate. The dyes, which exhibited suitable physical properties for use in a dye–pigment hybrid colour filter, were fabricated into colour filters, and their optical properties were measured. Note de contenu : - Synthesis - Preparation of hybrid ink based on dye-pigment - Fabrication of colour filters with hybrid ink - Investigation of dye solubility - Investigation of thermal stability DOI : 10.1111/cote.12260 En ligne : https://drive.google.com/file/d/1RSgyaF3s2pieRUjrrcfiDkgOCAfxK4Gv/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28229 [article]

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Application of solvent dye in the field of biodiesel preservation / Ana Caroline Dias de Souza in COLORATION TECHNOLOGY, Vol. 133, N° 2 (04/2017)  

[article]  inCOLORATION TECHNOLOGY > Vol. 133, N° 2 (04/2017) . - p. 165-169 Titre : Application of solvent dye in the field of biodiesel preservation Type de document : texte imprimé Auteurs : Ana Caroline Dias de Souza, Auteur ; Marina Comin, Auteur ; Luiz Henrique de Oliveira, Auteur ; Cinthia Aparecida de Andrade Silva, Auteur ; Rozanna Marques Muzzi, Auteur ; Antonio Rogério Fiorucci, Auteur ; Anderson Rodrigues Lima Caires, Auteur ; Magno Aparecido Gonçalves Trindade, Auteur Année de publication : 2017 Article en page(s) : p. 165-169 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Antioxydants Biocarburants -- Conservation Carburants diésel Colorants solvants Index. décimale : 667.2 Colorants et pigments Résumé : In this study, biodiesel (OSRB) from degummed oilseed radish oil (OSR) was obtained by transesterification, and the effect on its thermal stability of a binary compound containing a conventional antioxidant and a solvent dye was evaluated. A combination of the traditional antioxidant tert-butylhydroquinone (TBHQ) and a solvent dye, so-called CI Solvent Blue 35 (SB-35), was prepared and incorporated into OSR and OSRB prior to analysis. The acid value, peroxide value, and induction period were measured, and it was found that TBHQ and SB-35 were highly effective in stabilising OSR and OSRB when used in combination. The TBHQ/SB-35 blend had strong antioxidation activity, even at very low concentrations, when compared with the addition of the individual compounds. In summary, the results showed that a TBHQ/SB-35 blend may be successfully used as an alternative additive for improving oil and biodiesel preservation. Note de contenu : - MATERIALS AND METHODS : Instrumentation - Reagents, solutions, and biodiesel samples - Accelerated storage study - Procedure for stability studies by classical analytical titration - Determination of oxidative stability by the Rancimat method - RESULTS AND DISCUSSION : Physicochemical characterisation of OSR and OSRB - Stability of OSR and OSRB in the accelerated storage study - Determination of oxidation stability by Rancimat method DOI : 10.1111/cote.12263 En ligne : https://drive.google.com/file/d/1Ryk6jzuJQPTHZpDSBWwA6f2MldDVOeyS/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28230 [article]

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Fluorescent amino-substituted squaraine probes for bovine serum albumin / Katarzyna Jurek in COLORATION TECHNOLOGY, Vol. 133, N° 2 (04/2017)  

[article]  inCOLORATION TECHNOLOGY > Vol. 133, N° 2 (04/2017) . - p. 170-177 Titre : Fluorescent amino-substituted squaraine probes for bovine serum albumin Type de document : texte imprimé Auteurs : Katarzyna Jurek, Auteur ; Janina Kabatc, Auteur ; Katarzyna Kostrzewska, Auteur Année de publication : 2017 Article en page(s) : p. 170-177 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Colorants -- Synthèse Sérum-albumine Sondes fluorescentes Spectrophotométrie UV-Visible Spectroscopie de fluorescence Squaraines Les colorants squaraines sont une classe de colorants organiques présentant une fluorescence intense, typiquement dans la région infrarouge rouge et proche (les maxima d'absorption se trouvent entre 630 et 670 nm et leurs maxima d'émission se situent entre 650-700 nm). Ils sont caractérisés par leur système aromatique unique à anneaux à quatre chaînons dérivé de l'acide squaric . La plupart des squaraines sont encombrés par une attaque nucléophile de l'anneau central à quatre chaînons, qui est très déficient en électrons . Cette encombrement peut être atténué par la formation d'un rotaxane autour du colorant pour le protéger des nucléophiles. Ils sont actuellement utilisés comme capteurs pour les ions et récemment, avec l'avènement des dérivés de squanaine protégés, ont été exploités dans l'imagerie biomédicale. Index. décimale : 667.2 Colorants et pigments Résumé : The synthesis and spectroscopic properties of fluorescent amino-substituted squaraine dyes have been presented. The interaction between bovine serum albumin (BSA) and fluorescence probes derived from squaric acid was studied by UV-vis and fluorescence spectroscopies. The Benesi–Hildebrand, Lehrer, and Stern–Volmer equations were used to present the influence of BSA concentration on the binding constant for the process of association with squaraine dyes, as well as the effect of the concentration of fluorescence probes on the quenching process. It was also shown that the interaction between BSA and squaraine dyes is spontaneous. The number of binding sites to bovine serum albumin for a series of squaraine dyes has also been calculated. Note de contenu : - Synthesis - Materials - Preparation of dyes and protein solutions - Spectroscopic measurements DOI : 10.1111/cote.12264 En ligne : https://drive.google.com/file/d/1McvAGBRIvzZQ5HNfYaAdDaphWBWGgpkL/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28231 [article]

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Naphthoylenebenzimidazolone dyes as one-component photoinitiators / Rafal Strzelczyk in COLORATION TECHNOLOGY, Vol. 133, N° 2 (04/2017)  

[article]  inCOLORATION TECHNOLOGY > Vol. 133, N° 2 (04/2017) . - p. 178-183 Titre : Naphthoylenebenzimidazolone dyes as one-component photoinitiators Type de document : texte imprimé Auteurs : Rafal Strzelczyk, Auteur ; Radoslaw Podsiadly, Auteur Année de publication : 2017 Article en page(s) : p. 178-183 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Colorants Oxydoréduction Photoamorceurs (chimie) Photoréticulation Polyaddition Index. décimale : 667.2 Colorants et pigments Résumé : The appropriate substituents have been added to a 7H-benzimidazo[2,1-a]benz[de]isoquinolin-7-one skeleton in order to obtain a one-component initiator system. The absorption, fluorescence, and electrochemical properties of these naphthoylenebenzimidazolone dyes and their usefulness as visible light initiators of free radical polymerisation of trimethylolpropane triacrylate were examined. The initiation efficiency of these dyes was compared with that of the parent 7H-benzimidazo[2,1-a]benz[de]isoquinolin-7-one in the presence of a coinitiator. Results show that these bifunctional dyes are able to initiate polymerisation without an additional coinitiator. Photopolymerisation studies and the relationship between the rate of polymerisation and the free energy change for electron transfer revealed that, depending on the concentration, initiating radicals are generated via intra- and intermolecular electron transfer. DOI : 10.1111/cote.12266 En ligne : https://drive.google.com/file/d/1Ifn7hJnnErImnucwbhKJtz85aq4K5L07/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28232 [article]

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