Concentration profiles in phase-separating photocuring coatings / Hirokazu Yoshihara in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 6 (11/2019)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 16, N° 6 (11/2019) . - p. 1629-1636 Titre : Concentration profiles in phase-separating photocuring coatings Type de document : texte imprimé Auteurs : Hirokazu Yoshihara, Auteur ; Masato Yamamura, Auteur Année de publication : 2019 Article en page(s) : p. 1629-1636 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Photoréticulation Polyfluorure de vinylidène Revêtements -- Séchage sous rayonnement ultraviolet Revêtements organiques Séparation (technologie) Spectroscopie Raman Terpolymère styrène anhydride maléïque Index. décimale : 667.9 Revêtements et enduits Résumé : We directly measured the local composition profiles in phase-separating photocurable thin films using confocal Raman spectroscopy. To avoid light scattering at phase interfaces, we developed a novel technique to replace the solvent with a monomer to match the reflective indices in the cured films. The results indicated that the concentration distribution of the polymer was uniform in solvent-free monomer/initiator binary solutions, while it was spatially nonuniform when the solvent-based films were thermodynamically unstable and promoted reaction-induced phase separation upon UV irradiation on the top surface. In the latter case, the film exhibited a dual-layer structure, in which the polymer concentration was almost uniform near the top surface, while concentration gradients developed near the bottom surface. The thickness of the top layer with a uniform concentration profile increased with the increase in the UV light intensity. These results implied that the propagation of the reaction front and the resulting light-driven transport of the solvent toward the bottom coating layer played key roles in the formation of nonuniform concentration profiles in photocuring solution coatings. DOI : 10.1007/s11998-019-00216-3 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-019-00216-3.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33415 [article]

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Influence of different dispersants on the quality and stability of aqueous quinacridone magenta pigment dispersion for ink-jet applications / Rafal Gaida in COLORATION TECHNOLOGY, Vol. 139, N° 6 (12/2023)  

[article]  inCOLORATION TECHNOLOGY > Vol. 139, N° 6 (12/2023) . - p. 637-653 Titre : Influence of different dispersants on the quality and stability of aqueous quinacridone magenta pigment dispersion for ink-jet applications Type de document : texte imprimé Auteurs : Rafal Gaida, Auteur ; Kararzyna Dziubek, Auteur ; Katarzyna Krol, Auteur ; Monika Ostaszewska, Auteur ; Marian Wit, Auteur Année de publication : 2023 Article en page(s) : p. 637-653 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Agents dispersants (chimie) Dispersions et suspensions Dispersions et suspensions -- Stabilité Encre jet d'encre Ethoxylate d'alkyle Magenta Le magenta est un colorant rouge violacé d'aniline de synthèse inventé en 1858, appelé fuchsine ou roséine. C'est aussi la désignation normalisée du colorant primaire absorbant le vert dans la synthèse soustractive des couleurs en imprimerie et en photographie argentique. Masse molaire La masse molaire est la masse d'une mole d'une substance (un corps simple, un composé chimique). Elle s'exprime en grammes par mole (g·mol−1 ou g/mol). Pigments -- Analyse Pigments organiques Polyacrylates Quinacridone Les pigments de quinacridone sont des pigments organiques de synthèses qui vont du rouge-orange au rouge-violet. Ils sont utilisés depuis les années 1960 par les teinturiers et les fabricants de pigment set couleurs à peindre (et plus récemment par certains tatoueurs, comme pigment dans des encres de tatouage, avec un risque allergique). Il s'agit de pigments très transparents, au fort pouvoir colorant mais modérément couvrants. Leur transparence permet de varier les teintes selon la densité et l'épaisseur de l'application. Terpolymère styrène anhydride maléïque Index. décimale : 667.2 Colorants et pigments Résumé : The stability of water-based pigment dispersions is a key factor in determining their utility in ink-jet applications, and the appropriate choice of dispersant plays a special role. Among the pigment formulations tested to date, literature data on magenta pigments are very limited. Thus, the goal of this work was to study the influence of the type and loading of dispersants on the quality and stability of quinacridone magenta pigment dispersions. Three different commercially available dispersants were tested: (1) a cationic styrene-maleic anhydride copolymer, (2) an anionic polyacrylate, and (3) a nonionic alkyl ethoxylate. Pigment and dispersing agents were analysed using the Fourier Transform–infrared method. The stability of pigment dispersions was determined by comparative studies of changes in the pigment particle size, viscosity, pH, filtration time, optical density and gloss during the accelerated ageing test. Moreover, Turbiscan AGS and LUMiFuge analysers were used for evaluations of the instability of the dispersions. The properties of each dispersing agent affected the performances of the different dispersants. The highest stability for the pigment formulations was provided using the nonionic dispersant (small particle size, < 60 nm; the lowest viscosity < 60 mPa·s at the optimal dispersant content; favourable results of the filtration test; the highest pigment dispersability, proven by optical density and gloss). The Turbiscan AGS and LUMiFuge results indicated that the stability of all tested quinacridone magenta pigment dispersions was excellent (Turbiscan Stability Index values below three, and no significant differences in transmission profiles, respectively). However, it was found that the measurement results were influenced by the viscosity of the formulations. Note de contenu : - EXPERIMENTAL : Materials - Equipment and measuring conditions - Methods - RESULTS AND DISCUSSION : Analysis of the magenta pigment - Analysis of the dispersing agents - Stability study of pigment dispersions - Table 1 : Dispersant type active matter content used in the prepared Magenta Pigment dispersions - Table 2 : Molar mass of studied dispersants determined by gel permeation chromatography DOI : https://doi.org/10.1111/cote.12678 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12678 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40116 [article]

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One-step preparation of Comb-like surfactants containing poly(ethylene oxide) methyl ether and linear alkyl grafts in TENSIDE, SURFACTANTS, DETERGENTS, Vol. 48, N° 5 (09-10/2011)

[article]  inTENSIDE, SURFACTANTS, DETERGENTS > Vol. 48, N° 5 (09-10/2011) . - p. 415-420 Titre : One-step preparation of Comb-like surfactants containing poly(ethylene oxide) methyl ether and linear alkyl grafts Type de document : texte imprimé Année de publication : 2011 Article en page(s) : p. 415-420 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Chimie des surfaces Copolymères greffés Copolymérisation Surfactants Terpolymère styrène anhydride maléïque Index. décimale : 668.1 Agents tensioactifs : savons, détergents Résumé : The optimum one-step method for preparing comb-like surfactants with poly(styrene-co-maleic anhydride) (SMA) as backbone was investigated to achieve a commercial way for manufacture. The side chain molecule was introduced into reaction system while the radical copolymerization of styrene (St) and maleic anhydride (MA) in anhydrous inhibitor-free tetrahydrofuran (THF) was finished. The precipitation and purification process of SMA in traditional grafting-onto route was passed over. A series comb-like surfactants with various side chain, poly(styrene-comaleic anhydride)-g-(poly(ethylene glycol) monomethyl ether) (SMA-M), poly(styrene-co-maleic anhydride)-g-(poly(ethylene glycol) monomethyl ether & dodecane) (SMA-M+C12) and poly(styrene-co-maleic anhydride)-g-(dodecane) (SMA-C12), was prepared via this one step method respectively. The molecular weight of the products was measurement via gel permeation chromatography (GPC). The comb-like structures of the surfactants were confirmed by Infrared Spectroscopy (IR) and 1H nuclear magnetic resonance spectroscopy (1H NMR). The equilibrium surface tension was measured to evaluate the surface activity of comb-like surfactants. The surface activity of the product could be improved by using C12to carry out a hydrophobic modification. The surface activity of comb-like surfactants could be adjusted by using various side chains with different amphiphilic property. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12565 [article]

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Poly(ethylene-co-butylene)-b-(styrene-ranmaleic anhydride)2 compatibilizers via nitroxide mediated radical polymerization / B. Lessard in INTERNATIONAL POLYMER PROCESSING, Vol. XXVI, N° 2 (05/2011)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXVI, N° 2 (05/2011) Titre : Poly(ethylene-co-butylene)-b-(styrene-ranmaleic anhydride)2 compatibilizers via nitroxide mediated radical polymerization Type de document : texte imprimé Auteurs : B. Lessard, Auteur ; C. Aumand-Bourque, Auteur ; R. Chaudury, Auteur ; D. Gomez, Auteur ; A. Haroon, Auteur ; N. Ibrahimian, Auteur ; S. Mackay, Auteur ; M.-C. Noel, Auteur ; R. Patel, Auteur ; S. Sitaram, Auteur ; S. Valla, Auteur ; B. White, Auteur ; M. Maric, Auteur Année de publication : 2011 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Alliages polymères Chromatographie sur gel Copolymères séquencés Copolymérisation nitroxydes Polyaddition Polyamide 6 Polyéthylène-co-butylène Polymères téléchéliques Terpolymère styrène anhydride maléïque Index. décimale : 668.9 Polymères Résumé : Telechelic poly(ethylene-ran-butylene) initiator terminated with [tert-butyl[1-(diethoxyphosphoryl)-2,2-dimethylpropyl]amino] nitroxide groups (PEB-(SG1)2) was used to initiate the controlled radical copolymerization of maleic anhydride (MA) and styrene (ST). The ST/MA copolymerizations were performed in 1,4-dioxane at 110 °C and resulted in PEB-b-P(ST-ran-MA)2triblock copolymers with relatively narrow molecular weight distributions (¯Mm/¯Mn≈ 1.5). Gel permeation chromatography (GPC) indicated that the initiator used was ≈ 93% efficient. The resulting copolymers were then blended as 20 wt.% dispersions in nylon 6 (PA6) at 230 °C. With as little as 10 mol.% of MA in the feed to make the PEB-b-P(ST-ran-MA)2, blends were deemed dynamically compatibilized based on the reduced particle size. All of the PEB-b-P(ST-ran-MA)2/PA6 blends resulted in a minor phase particle size ¯DVS = 0.1 μm while the PEB-b-P(ST)/PA6 blend had ¯DVS = 1.15 μm (i. e. no MA in the copolymer). Tensile testing revealed yield stresses and strains decreased steadily from pure PA6 to non-reactive PEB-b-P(ST)2/PA6 to PEB-b-P(STran-MA)2/PA6. However, no difference in tensile properties was observed between PEB-b-P(ST-ran-MA)2/PA6 samples made from PEB-b-P(ST-ran-MA)2copolymer of varying MA content. DOI : 10.3139/217.2425 En ligne : https://drive.google.com/file/d/13v9vmCkrl8CmEdNzpQRsOLpMfIhFyUkW/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11523 [article]

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