Allylic alcohols improve acrylic polyols / Daniel B. Pourreau in EUROPEAN COATINGS JOURNAL (ECJ), N° 11/2004 (11/2004)  

[article]  inEUROPEAN COATINGS JOURNAL (ECJ) > N° 11/2004 (11/2004) . - p. 22-31 Titre : Allylic alcohols improve acrylic polyols Type de document : texte imprimé Auteurs : Daniel B. Pourreau, Auteur ; Wei Wang, Auteur ; Ronald H. Blackwell, Auteur ; Stephen Harris, Auteur Année de publication : 2004 Article en page(s) : p. 22-31 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 667.9 Revêtements et enduits Résumé : Low VOC components - Efforts to reduce the VOC content of two-component urethane coatings have focused primarely on lowering the molecular weight of the polyols. Unfortunatly, the OH fonctionnality of conventionnal polyols decreased linearly with molecular weight. With that, the crosslinkingability of the polyol and the performance of the coating also decrease. This inherant limitation has been overcome by developing a new class of acrylic polyols based on allylic alcohols. En ligne : https://drive.google.com/file/d/1Zb29CR3taQa91hTnnlmq45jE3F4KJCxe/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=9127 [article]

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Better resin management / Shao-Hua Guo in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 192, N° 4452 (05/2002)

[article]  inPOLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 192, N° 4452 (05/2002) . - p. 24-27 Titre : Better resin management Type de document : texte imprimé Auteurs : Shao-Hua Guo, Auteur ; Wei Wang, Auteur ; Stephen H. Harris, Auteur ; Shanty Patel, Auteur ; L. Joseph Junker, Auteur ; Ronald S. Blackwell, Auteur ; Farhad Faddakar, Auteur ; Daniel B. Pourreau, Auteur Année de publication : 2002 Article en page(s) : p. 24-27 Langues : Anglais (eng) Catégories : Acrylates hydroxy-fonctionnels Automobiles -- Revêtements:Automobiles -- Peinture Copolymère uréthane acrylique Durée de vie en pot Formulation (Génie chimique) Groupe allyle Polyhydroxyéthyle acétate Polyméthacrylate d'hydroxyéthyle Polyols Revêtements bi-composant:Peinture bi-composant Index. décimale : 667.9 Revêtements et enduits Résumé : The evolution in the approach for developing low-VOC coatings is examined. Acrylic two-component (2K) urethane technology has undergone a gradual evolution over the past twenty years. Incremental changes in acrylic polyols and isocyanate crosslinkers have been, for the most part, driven by lower VOC content limits and increased performance requirements. However, the basic chemistry of acrylic polyols has not substantially changed over that time period. Almost every acrylic polyol on the market today is obtained by free-radical polymerisation of acrylate and methacrylate esters and styrene. Hydroxyl functionality is introduced by adding hydro-functional acrylates (HFAs) to the monomer blend. Note de contenu : - Lower VOCs hits performance - The resin management concept - End-use versatility - Improving control - Resin management at work - Pot life - Overall benefits - FIGURES : 1. Hydroxy-functional acrylates (HFA) used in conventional polyols - 2. HFA polyols have greater variation of functionality with weight - 3. Allylic monomers used in the latest acrylic polyols - 4. Comparison of HEMA-based and AP1.0-based polyols - TABLE : White pigmented 2K urethane formulations from hard and soft blends and commercial acrylic polyols Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28083 [article]

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Computational modelling of the influence of substituent effects on phthalimidylazo disperse dye hydrolysis and interaction energy / Yi-Zhen Zhan in COLORATION TECHNOLOGY, Vol. 134, N° 1 (02/2018)  

[article]  inCOLORATION TECHNOLOGY > Vol. 134, N° 1 (02/2018) . - p. 24-32 Titre : Computational modelling of the influence of substituent effects on phthalimidylazo disperse dye hydrolysis and interaction energy Type de document : texte imprimé Auteurs : Yi-Zhen Zhan, Auteur ; Xue Zhao, Auteur ; Bi-Jia Wang, Auteur ; Wei Wang, Auteur Année de publication : 2018 Article en page(s) : p. 24-32 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Colorants -- Synthèse Colorants azoïques Dynamique moléculaire Fonctionnelles densité La théorie de la fonctionnelle de la densité (pour Density Functional Theory, sous-entendu électronique : DFT) constitue au début du XXIe siècle l'une des méthodes les plus utilisées dans les calculs quantiques de la structure électronique de la matière (atomes, molécules, solides) aussi bien en physique de la matière condensée qu'en chimie quantique. La DFT trouve ses origines dans le modèle développé par Llewellyn Thomas et Enrico Fermi à la fin des années 1920. Hydrolyse Modèles numériques Index. décimale : 667.3 Teinture et impression des tissus Résumé : Six azo dyes have been synthesised using N-substituted phthalimides as diazo components. Substitution effects on dye hydrolysis and intermolecular interactions were investigated with density functional theory (DFT) at B3LYP/6-311G level. The results showed that the phthalimide moieties adopted a coplanar conformation in respect of the azo-coupled phenyl rings in all six dyes. N-Alkyl substitution had little influence on the absorption maxima. Bromo and cyano substitution on the phthalimide ring resulted in hypsochromic and bathochromic shifts of the absorption maxima respectively. Hydrolysis of the phthalimide ring was found to be largely influenced by steric effects rather than inductive effects of substituents. It was also found that π-stacking interactions of phthalimide/phenyl and phthalimide/phthalimide dimers were promoted by substituents. The results indicated that interactions are dominated by electrostatic and even more importantly dispersion forces. The computational results were also confirmed experimentally. Note de contenu : - EXPERIMENTAL : Materials - Spectrophotometry - Dye application - Measurements - DFT calculations - Synthesis of the phthalimidylazo disperse dyes - Synthesis of phthalimide intermediates - Synthesis of D1-D4, D5 and D6 - RESULTS AND DISCUSSION : Influence of substitution pattern on planarity - Influence of substituents on dye shade - Influence of substituents on hydrolytic properties - Influence of substitution on interaction energy DOI : 10.1111/cote.12316 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12316 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30124 [article]

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Degradation of zinc-rich epoxy coating in 3.5% NaCl solution and evolution of its EIS parameters / Chao Xing in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 3 (05/2021)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 18, N° 3 (05/2021) . - p. 843-860 Titre : Degradation of zinc-rich epoxy coating in 3.5% NaCl solution and evolution of its EIS parameters Type de document : texte imprimé Auteurs : Chao Xing, Auteur ; Wei Wang, Auteur ; Shuai Qu, Auteur ; Yuming Tang, Auteur ; Xuhui Zhao, Auteur ; Yu Zuo, Auteur Année de publication : 2021 Article en page(s) : p. 843-860 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Epoxydes Humidité -- Absorption:Eau -- Absorption Matériaux -- Propriétés barrières Porosité Protection cathodique Revêtements -- Détérioration Revêtements organiques Spectroscopie d'impédance électrochimique Test d'immersion Zinc Index. décimale : 667.9 Revêtements et enduits Résumé : The electrochemical characteristics in the degradation process of epoxy zinc-rich coating (80 wt% zinc particles) and epoxy varnish coating in 3.5% NaCl solution were studied comparatively by using open-circuit potential and electrochemical impedance spectroscopy tests. The coating morphology, the consumption and corrosion products of zinc particles and chemical changes in the coatings were observed and analyzed with the methods of scanning electron microscopy and X-ray diffraction. The results show that the zinc-rich coating provides effective cathodic protection to the carbon steel substrate at the initial stage and still provides certain cathodic protection in the period when the barrier protection by the formation of zinc corrosion products begins to dominate. Because the zinc particles are conductive and active, the values of the coating resistance and capacitance of zinc-rich coatings are lower than those of the varnish coating. When the value of |Z|0.01Hz decreases to 8 × 104 Ω cm2, the zinc-rich coatings still provide protection to the steel substrate, but when the value decreases to about 2 × 104 Ω cm2, rusted spots were observed on the coating surface. Based on the results, a reference criterion of failure for the zinc-rich epoxy coatings is suggested to be about 5 × 104 Ω cm2 (2 × 104 – 8 × 104 Ω cm2), which is different from the one (106 Ω cm2) reported in the literature for typical organic coatings without conductive particles. Note de contenu : - EXPERIMENTAL : Materials and samples preparation - Methods - Calculation of coating porosity and water absorption - RESULTS AND DISCUSSION : OCP measurements - EIS plots of the coating samples and the SEM analysis - EIS fitting results and analysis of the impedance parameters - SEM morphology of the zinc-rich epoxy coatings and consumption of zinc particles - FTIR results of the coatings - Table 1 : The equivalent electrical circuits of the coating samples in different immersion periods - Table 2 : EDS results of zinc-rich epoxy coating (90 μm) after 76 d of immersion - Table 3 : EDS results of zinc-rich epoxy coating (90 μm) after 287 d of immersion DOI : https://doi.org/10.1007/s11998-020-00448-8 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-020-00448-8.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35934 [article]

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Design and fabrication of superhydrophobic layered double hydroxide and oxides composite coating on brass mesh with excellent anticorrosion, delay icing and oil-water separation ability / Yuanyuan Wang in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 1 (01/2023)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 20, N° 1 (01/2023) . - p. 275-289 Titre : Design and fabrication of superhydrophobic layered double hydroxide and oxides composite coating on brass mesh with excellent anticorrosion, delay icing and oil-water separation ability Type de document : texte imprimé Auteurs : Yuanyuan Wang, Auteur ; Qian Zhong, Auteur ; Linqiu Wu, Auteur ; Pengfei Liu, Auteur ; Hangmin Guan, Auteur ; Yingfei Hu, Auteur ; Qing Lin, Auteur ; Wei Wang, Auteur Année de publication : 2023 Article en page(s) : p. 275-289 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Anticorrosifs Anticorrosion Caractérisation Composites Filtres auto-nettoyants Hydroxydes doubles lamellaires Laiton Les laitons sont des alliages jaunes, très ductiles et malléables, composés essentiellement de cuivre et de zinc, aux proportions variables, dont la fabrication directe à partir de minerais appropriés était déjà maîtrisée par les métallurgistes avant l'Antiquité. Selon les propriétés visées, ils peuvent aujourd'hui contenir d'autres éléments d'addition comme le plomb, l'étain, le nickel, le chrome et le magnésium, dans des proportions très modérées. (Wikipedia) Maille métallique Oléophilie Revêtements Revêtements antigel Séparation huile/eau Index. décimale : 667.9 Revêtements et enduits Résumé : In this work, a superhydrophobic and superoleophilic brass mesh had been prepared. The prepared sample displayed a water contact angle (WCA) of 160o and was characterized by field emission scanning electron microscope (FE-SEM), white light interferometer (WLI), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS) techniques. Besides, a high-speed camera was used to study the impact process of a droplet on the surface of the prepared sample. The superhydrophobic brass mesh exhibited excellent self-cleaning ability, environmental adaptability, corrosion resistance (η = 98.9%), and delayed icing ability (~ 45 min). Furthermore, the superhydrophobic mesh could be used as a filter to fast and efficiently separate various kinds of oils (light and heavy oils) and oil pollutants in daily life and industry. The superhydrophobic filter could be reused 50 times for oil-water separation without any apparent decrease in its separation capability. Thus, the superhydrophobic brass mesh prepared by a simple method holds promise for various applications in the industrial field of oil-water separation. Note de contenu : EXPERIMENTAL AND CHARACTERIZATION : Materials - Sample preparation - Sample characterizations - Self-cleaning ability - Environmental adaptability - Corrosion resistance - Delayed icing test - Oil-water separation - RESULTS AND DISCUSSION : Surface morphology, roughness and composition - Surface wettability - Self-cleaning ability - Environmental adaptability - Corrosion resistance - Delayed icing ability - Oil-water separation - Table 1: Corrosion potential, corrosion current, and corrosion resistance efficiency of the original brass mesh, Brass-LDH, and Brass-LDH-SA in a 3.5 wt% NaCl solution DOI : https://doi.org/10.1007/s11998-022-00667-1 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00667-1.pdf?pdf=button% [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38842 [article]

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Effect of the composition of vinyl polymer tannages on the physical properties of leather / Jianzhong Ma in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCVI, N° 1 (01/2001)  

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Improving the dyeability of polyimide by pretreatment with alkali / Zehong Wang in COLORATION TECHNOLOGY, Vol. 132, N° 6 (12/2016)  

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PAN nano-cobweb-bead-on-string fiber composite membrane for air filtration / Yazhi Liu in CHEMICAL FIBERS INTERNATIONAL, Vol. 72, N° 4 (11/2022)  

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PAN nano-cobweb/bead-on-string fiber composite membrane for air filtration / Yazhi Liu in TECHNICAL TEXTILES, Vol. 65, N° 5 (12/2022)  

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Proficiency testing for determination of hexavalent chromium in leather in China / Zhiding Huang in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 104, N° 2 (03-04/2020)  

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Progress of certified reference materials in the leather field / Zhiding Huang in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 103, N° 2 (03-04/2019)  

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Simulation of realistic fur texture based on piece element synthesis / Wei Wang in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVII, N° 12 (12/2022)  

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Super robust, anti-bacterial polyurethane ionogel with high sensitivity and hydrophobicity / Wei Wang in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIX, N° 1 (01/2024)  

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Synthesis and characterization of organosilicon-modified self-matting waterborne polyurethane with excellent wear resistance / Pengfei Niu in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 6 (11/2023)  

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Synthesis of waterborne polyurethane–silver nanoparticle antibacterial coating for synthetic leather / Xiaohui Zhang in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 15, N° 2 (03/2018)  

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The correlation between composition of vinyl polymer tannages and their properties / Wei Wang in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 85, N° 4 (07-08/2001)  

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The correlation between the comonomer ratios of vinyl polymer tannages and their application properties / Jianzhong Ma in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 86, N° 2 (03-04/2002)  

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Theoretical study of the interaction energy of benzodifuranone dye molecule rings / Yi-Zhen Zhan in COLORATION TECHNOLOGY, Vol. 133, N° 1 (02/2017)  

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With al to the right color / Erwin Houben in KUNSTSTOFFE INTERNATIONAL, Vol. 113, N° 5 (2023)  

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