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Preparation and evaluation of amphiphilic polymer as fouling-release coating in marine environment / Peiqing Wang in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 14, N° 6 (11/2017)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 14, N° 6 (11/2017) . - p. 1237-1245 Titre : Preparation and evaluation of amphiphilic polymer as fouling-release coating in marine environment Type de document : texte imprimé Auteurs : Peiqing Wang, Auteur ; Hong Jiang, Auteur ; Chunhua Ding, Auteur ; Guoqing Wang, Auteur ; Zhuolin Xie, Auteur ; Jiang Li, Auteur Année de publication : 2017 Article en page(s) : p. 1237-1245 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Copolymère styrène butadiène styrène Copolymères Fluoropolymères Marines (peinture) Polyéthylène glycol Polymères amphiphiles Revêtements antisalissures:Peinture antisalissures Index. décimale : 667.9 Revêtements et enduits Résumé : Polystyrene–polybutadiene–polystyrene (SBS), vinyl fluoride silicone (BD-FT-LSR) and polyethylene glycol were chosen as the reactors to synthesize amphiphilic polymer which was used to prepare a new type of fouling-release coating. To evaluate the fouling-release performance and explore the mechanism of the coating, artificial and real-sea environment tests were carried out in the experiments, respectively. IR and 1H NMR were utilized to characterize the structure of the polymer. The effect of fouling-release agent was explored by considering changes in the parameters of surface contact angle, XPS, elastic modulus, and TEM. Results of real-sea tests show that the new amphiphilic fouling-release coating has a very good antifouling performance and can be re-cleaned after 6 months of testing in the real-sea environment. These can be explained through hydrophilic PEG migrating to the surface to form a comb-type structure which reduces the adhesion strength of fouling organisms that can then be self-cleaned by flow from the surface of coatings. Note de contenu : - Materials - The preparation of amphiphilic polymer (SBS-co-BD-FT-LSR)-r-PEG - Preparation and characterization of coatings - Tests of water contact angle - Tests of elastic modulus - Tests of surface composition - Morphology of the coatings - Antifouling tests in laboratories - Antifouling tests in the real-sea environment DOI : 10.1007/s11998-017-9935-4 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-017-9935-4.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=29622 [article]

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Water permeation and corrosion resistance of single- and two-component hydrophobic polysiloxane barrier coatings / X. Sun in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 14, N° 6 (11/2017)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 14, N° 6 (11/2017) . - p. 1247-1258 Titre : Water permeation and corrosion resistance of single- and two-component hydrophobic polysiloxane barrier coatings Type de document : texte imprimé Auteurs : X. Sun, Auteur ; S. Turnage, Auteur ; Nicholas Dhuyvetter, Auteur ; Erick B. Iezzi, Auteur ; Y. Yang, Auteur ; B. Chang, Auteur ; N. C. Muthegowda, Auteur ; S. K. Balijepalli, Auteur ; L. P. Wang, Auteur ; K. N. Solanki, Auteur ; K. Rykaczewski, Auteur Année de publication : 2017 Article en page(s) : p. 1247-1258 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Anticorrosifs Anticorrosion Essais de résilience Fourier, Spectroscopie infrarouge à transformée de Hydrophobie Matériaux -- Propriétés barrières Microscopie électronique à balayage Revêtements protecteurs Spectroscopie d'impédance électrochimique Test d'immersion Index. décimale : 667.9 Revêtements et enduits Résumé : The degradation of corrosion preventative coatings contributes to the high cost and time requirements for maintaining structures in harsh environments. However, the development of new hydrophobic coatings holds the promise of extending the usable life of structures in marine environments. In this work, we quantify the barrier properties and corrosion resistance of two novel highly hydrophobic polysiloxane formulations and the legacy silicone alkyd topcoat used on the topside of Navy’s ships, all with haze gray pigmentation. Based on FTIR-ATR and EIS measurements of the pristine coatings, both the single- (1K) and the two-component (2K) polysiloxane provide significantly improved barrier characteristics (lower water diffusion coefficient and capacitance) than the silicone alkyd. These results were confirmed through a 3-month-long immersion corrosion test, which also showed that the 1K and 2K polysiloxane coatings had comparable degradation characteristic and remained highly hydrophobic. Note de contenu : - EXPERIMENTAL : Materials - Preparation of two-component polysiloxane coating - Preparation of single-component polysiloxane coating - Water diffusion coefficient measurements using FTIR-ATR - Immersion corrosion tests - Characterization of the pristine and corroded coated steel samples - RESULTS AND DISCUSSION : Characterization of the pristine coatings - Immersion corrosion tests - Scribe tests DOI : 10.1007/s11998-017-9918-5 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-017-9918-5.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=29625 [article]

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A novel acrylate-PDMS composite latex with controlled phase compatibility prepared by emulsion polymerization / Weili Li in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 14, N° 6 (11/2017)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 14, N° 6 (11/2017) . - p. 1259-1269 Titre : A novel acrylate-PDMS composite latex with controlled phase compatibility prepared by emulsion polymerization Type de document : texte imprimé Auteurs : Weili Li, Auteur ; Wenjun Shen, Auteur ; Wei Yao, Auteur ; Jijun Tang, Auteur ; Jie Xu, Auteur ; Lei Jin, Auteur ; Jide Zhang, Auteur ; Zexiao Xu, Auteur Année de publication : 2017 Article en page(s) : p. 1259-1269 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Anticorrosifs Anticorrosion Caractérisation Copolymère silicone acrylate Hydrophobie Latex Polymérisation en émulsion Stabilité thermique Index. décimale : 667.9 Revêtements et enduits Résumé : In this paper, a series of acrylate-polydimethylsiloxane (PDMS) composite latexes was prepared and studied systematically to find the factors that affect their performances. At first, the modified PDMS was synthesized to react with acrylate monomers and participate in free radical polymerization. Then, the modified PDMS was blended with acrylate monomers, and the acrylate-PDMS composite latexes with different formulas were obtained by emulsion polymerization. Because the blending monomers were constrained in the micelle, the two components were interconnected with each other by a covalent bond and the phase compatibility between the two components could be controlled well. Chemical constitution and the morphology of acrylate-PDMS composite latexes were confirmed by using FTIR spectroscopy, TEM, and SEM measurements, respectively. Thermophysics and heat resistance of the dried coatings based on acrylate-PDMS composite latexes were studied using DSC and TGA tests, respectively. Anticorrosion properties of the cured coatings based on acrylate-PDMS composite latexes were confirmed by potentiodynamic polarization test. With low surface tension, good toughness, excellent weather-proof properties, and good high and low temperature stability, the modified PDMS component can improve the performance of the traditional acrylate latex-based waterborne resin effectively, and the prepared acrylate-PDMS composite latexes can be used in heavy-duty anticorrosion applications. Note de contenu : - EXPERIMENT : Materials - Preparation of modified PDMS - Preparation of acrylate-PDMS composite latex - Coating procedure - Characterization - RESULTS AND DISCUSSION : FTIR measurement - Morphology measurements - Study on the influence of acrylate component on the properties of acrylate-PDMS composite latexes - Study on the influence of the modified PDMS on acrylate-PDMS composite latexes DOI : 10.1007/s11998-017-9923-8 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-017-9923-8.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=29626 [article]

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Surface coating performance of TiO2 nanoparticle-modified veneered panels and their influence on formaldehyde emission / Xiao Dong Zhu in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 14, N° 6 (11/2017)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 14, N° 6 (11/2017) . - p. 1271-1278 Titre : Surface coating performance of TiO2 nanoparticle-modified veneered panels and their influence on formaldehyde emission Type de document : texte imprimé Auteurs : Xiao Dong Zhu, Auteur ; Yu Liu, Auteur ; Li Zhao, Auteur Année de publication : 2017 Article en page(s) : p. 1271-1278 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Air intérieur -- Pollution Atmosphère -- Pollution -- Lutte contre Dioxyde de titane Formaldéhyde Nanoparticules Panneaux de fibres Polluants atmosphériques Polluants organiques Réduction des composés organiques volatils Vernis en phase aqueuse Index. décimale : 667.9 Revêtements et enduits Résumé : The physical and mechanical properties of wood and wood-based panels can be effectively improved by modification with nanoparticles. This paper focuses on effects of modifying veneer with titanium dioxide (TiO2) nanoparticles on the performance of a waterborne coating and formaldehyde emission. Commercial waterborne varnish was used to apply a surface finish on the modified veneered panels. Changes caused by TiO2 nanoparticle treatment that could affect the finishing performance were measured. The results showed slight increases in the weight and contact angle of the veneers treated with TiO2 nanoparticles, whereas the modified veneered panels after surface finishing presented improved hardness at high nanoparticle loadings. Modification of the veneers by nanoparticles had a minor negative influence on the coating glossiness and adhesion due to a blocking effect between the coating film and the modified veneers. Formaldehyde emissions were considerably reduced due to degradation by the TiO2 particles under UV-light irritation. Note de contenu : - MATERIALS AND METHODS : Materials - Determination of properties - RESULTS AND DISCUSSION : Effect of nanosized TiO2 particles on the weight percent gain and CA - Appearance of the nanocomposite veneers - Effect of nanoparticles on the surface coating properties - Formaldehyde emission DOI : 10.1007/s11998-017-9925-6 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-017-9925-6.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=29627 [article]

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The preparation of hybrid trimer by cyclo-oligomerization of TDI and HDI and its curing process with polyols to form elastic PU coating / Qian Wang in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 14, N° 6 (11/2017)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 14, N° 6 (11/2017) . - p. 1279-1288 Titre : The preparation of hybrid trimer by cyclo-oligomerization of TDI and HDI and its curing process with polyols to form elastic PU coating Type de document : texte imprimé Auteurs : Qian Wang, Auteur ; Hang Xu, Auteur ; ShengZhong Zhou, Auteur ; Sébastien Garnier, Auteur ; Stefan Füldner, Auteur ; Lin Ye, Auteur ; Zengguo Feng, Auteur Année de publication : 2017 Article en page(s) : p. 1279-1288 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Diisocyanate d'hexaméthylène Diisocyanate de toluène Le diisocyanate de toluène (TDI : Toluene diisocyanate) est un composé organique, toxique et allergène, appartenant au groupe des isocyanates. C'est l'un des monomères de départ utilisés pour la production de polyuréthane par polymérisation. Le TDI peut réagir avec un polyol ce qui permet de former une structure uréthane. Le TDI est produit industriellement en faisant réagir du diaminotoluène (en fait un mélange de 2,4-diaminotoluène et de 2,6-diaminotoluène dans un ratio 80:20) avec du phosgène (COCl2), ce qui conduit au TDI avec une production secondaire de chlorure d'hydrogène HCl. Il sert à fabriquer des mousses expansées, molles, semi-rigides ou rigides de polyuréthane, des adhésifs, peintures, enduits souples, élastomères, etc. Elasticité Oligomères Polymères -- Synthèse Polyuréthanes Revêtements Index. décimale : 667.9 Revêtements et enduits Résumé : The hybrid cyclic isocyanate trimer with appropriate functionality and good solvent tolerance which can be used as a building block to construct polyurethane (PU) coatings was prepared by cyclo-oligomerization of toluene diisocyanate (TDI) and hexamethylene diisocyanate (HDI). Among all the tested catalysts, the self-made catalyst 3-(trimethylammonio)propyl carbonate (Cat. 4) was found to possess enough catalytic efficiency to confirm the NCO conversion to reach about 50% with both high (1 wt%) and low (0.25 wt%) catalyst loading at low temperature (40°C). The IR and NMR results proved the formation of a hybrid trimer, while HPLC results showed hybrid TDI/HDI trimer predominated in the product and only trace amounts of TDI monomer (<0.5 wt%) and oligomer with higher degree of polymerization (DP) remained. Furthermore, the formed hybrid oligomer exhibited excellent solvent tolerance to benzene, chlorinated, and acetate solvents. Consequently, Cat. 4 was demonstrated to be a suitable catalyst for cyclo-oligomerization since it not only possessed enough catalytic efficiency at low temperature but also hardly resulted in higher DP oligomer. Furthermore, the curing process with PTHF-r-PEO polyol was conducted as a pilot experiment to form PU coatings at room temperature. The disappearance of NCO group in IR spectrum as well as higher storage modulus against loss modulus implied the successful curing process. The strain–stress test showed the high tensile strength of formed PU coating, whereas the rheological test and dynamic mechanical analyzer proved the formed PU coating was a typical elastic material with good crosslink structure. These results indicate the promising potential of formed PU made from hybrid TDI/HDI trimer for coating applications. Note de contenu : - EXPERIMENTAL : Materials and measurement - Synthesis of TDI/HDI hybrid trimer - Synthesis of polyurethane with TDI/HDI oligomers - RESULTS AND DISCUSSION : Catalytic screening - The characterization of TDI/HDI trimers - Influence of the ratio of TDI/HDI on the oligomerization - Solvent compatibility - The curing process of TDI/HDI trimer DOI : 10.1007/s11998-017-9926-5 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-017-9926-5.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=29628 [article]

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A facile process for fabrication of environmentally safe superhydrophobic surfaces / Tanu Mittal in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 14, N° 6 (11/2017)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 14, N° 6 (11/2017) . - p. 1289-1295 Titre : A facile process for fabrication of environmentally safe superhydrophobic surfaces Type de document : texte imprimé Auteurs : Tanu Mittal, Auteur ; Sangeeta Tiwari, Auteur ; S. K. Tiwari, Auteur Année de publication : 2017 Article en page(s) : p. 1289-1295 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Dioxyde de silicium Dip-coating Fluoropolymères Hydrophobie Revêtement auto-nettoyant Revêtements multicouches Sol-gel, Procédé Verre -- Revêtements Index. décimale : 667.9 Revêtements et enduits Résumé : Superhydrophobic coatings have opened new vistas in the field of self-cleaning surfaces by having improved performance, robustness and preservation of cleaning agents including water. Presently, fluoropolymers are extensively explored and used for this purpose. However, the major drawback accompanying fluoropolymers is formation of environmentally persistent and toxic compounds, viz. PFOA (perfluorooctanoic acid) and PFOS (perfluorooctanesulfonic acid) on their degradation raising concern on their use. In the present study, an effort has been made to develop a facile process by using an environmentally safe material. A simple dip coating technique is reported to fabricate superhydrophobic surface. SiO2 nanoparticles of size 25–30 nm, prepared by sol–gel route, were dip-coated on glass substrate in multilayers followed by coating of a surfactant to achieve homogeneity of SiO2 layers and enhanced binding with subsequent layer of NUVA-2114 [a commercially used fluorotelomer with chemical composition C2F6(CF2CF2)nX]. It was observed that SiO2 nanoparticles and sodium dodecyl sulfate (SDS) surfactant exhibit a synergistic effect on interface stability at optimized SDS concentration. A water contact angle of 152° is achieved. The established method is simple, scalable, environmentally safe and cost-effective. Note de contenu : - EXPERIMENTAL : Materials - Preparation of SiO2 NPs by sol–gel route - Deposition of SiO2 NPs on glass substrate - Deposition of SDS and NUVA 2114 layers over SiO2 NPs - Characterization - RESULTS AND DISCUSSION : Particle size and morphology of SiO2 NPs - SiO2 NPs deposition on glass substrate - Role of SDS in stabilization of interfaces between various layers - CONTACT ANGLE AND AFM ANALYSIS - OPTICAL CHARACTERIZATION DOI : 10.1007/s11998-017-9927-4 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-017-9927-4.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=29629 [article]

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An analytical model of nanopatterned superhydrophobic surfaces / K. Xiao in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 14, N° 6 (11/2017)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 14, N° 6 (11/2017) . - P. 1297-1306 Titre : An analytical model of nanopatterned superhydrophobic surfaces Type de document : texte imprimé Auteurs : K. Xiao, Auteur ; Y. P. Zhao, Auteur ; G. Ouyang, Auteur ; X. L. Li, Auteur Année de publication : 2017 Article en page(s) : P. 1297-1306 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Hydrophobie Mouillage (chimie des surfaces) Nucléation Thermodynamique Index. décimale : 667.9 Revêtements et enduits Résumé : Wetting behaviors on a hydrophobic nanopatterned surface, which are of primary consideration in the design of superhydrophobic surfaces, are studied on an analytic model that shows the hole-patterned substrate is more favorable for water droplets to nucleate on the inside of holes based on nucleation theory. After droplet nucleation, the transition from Wenzel state to Cassie–Baxter state may occur during the growth stage. The calculation of the free energy of droplets during the growth stage indicates that the wetting transitions depend on the volume of the droplets, and Wenzel state or Cassie–Baxter state depends on the absolute size and relative size of the geometrical morphology of the nanoholes. Note de contenu : - THERMODYNAMIC MODEL : Nucleation stage - Growth stage - RESULTS AND DISCUSSION : Nucleation stage DOI : 10.1007/s11998-017-9941-6 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-017-9941-6.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=29630 [article]

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Polyaniline/g-C3N4 composites as novel media for anticorrosion coatings / Shixiang Zuo in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 14, N° 6 (11/2017)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 14, N° 6 (11/2017) . - p. 1307-1314 Titre : Polyaniline/g-C3N4 composites as novel media for anticorrosion coatings Type de document : texte imprimé Auteurs : Shixiang Zuo, Auteur ; Yao Chen, Auteur ; Wenjie Liu, Auteur ; Chao Yao, Auteur ; Yingruo Li, Auteur ; Jiangquan Ma, Auteur ; Yong Kong, Auteur ; Huihui Mao, Auteur ; Li Zhongyu, Auteur ; Yongsheng Fu, Auteur Année de publication : 2017 Article en page(s) : p. 1307-1314 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Anticorrosifs Anticorrosion Electrochimie Exfoliation Nitrure de carbone graphitique Polyaniline Index. décimale : 667.9 Revêtements et enduits Résumé : In this paper, graphitic carbon nitride (g-C3N4) was first proposed for the pioneer application of anticorrosion coatings. Original g-C3N4 was facilely treated using HNO3 and the exfoliated g-C3N4 sheets (E-g-C3N4) were fabricated, and then, polyaniline/E-g-C3N4 composites (PANI/E-g-C3N4) as novel anticorrosive media were synthesized by chemical oxidative polymerization and devoted to the corrosion protection of coatings. The E-g-C3N4 sheets and PANI/E-g-C3N4 composites were characterized by X-ray diffraction, Fourier transform infrared, thermogravimetric analysis, and transmission electron microscopy. The anticorrosion properties of the samples prepared were investigated by electrochemical measurements including Tafel plots, electrochemical impedance spectra, and open-circuit potential. Accelerated corrosion tests of iron panels coated by PANI/E-g-C3N4 were performed in 3.5 wt% NaCl solution. Anticorrosive mechanism of PANI/E-g-C3N4 was discussed in detail. PANI/E-g-C3N4-3 fillers possessed superior corrosion inhibition than individual components on iron coatings, which was due to the synergetic effect of anticorrosion between E-g-C3N4 and PANI. Note de contenu : - EXPERIMENTAL : Preparation of PANI/E-g-C3N4 composites - Preparation of anticorrosion coatings - Characterization methods - Evaluation of anticorrosion performance - RESULTS AND DISCUSSION : Structures characterization - Morphologies characterization - Corrosion studies DOI : 10.1007/s11998-017-9916-7 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-017-9916-7.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=29635 [article]

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Properties and anticorrosion application of acrylic ester/epoxy core–shell emulsions: effects of epoxy value and crosslinking monomer / Ke Zhu in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 14, N° 6 (11/2017)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 14, N° 6 (11/2017) . - p. 1315-1324 Titre : Properties and anticorrosion application of acrylic ester/epoxy core–shell emulsions: effects of epoxy value and crosslinking monomer Type de document : texte imprimé Auteurs : Ke Zhu, Auteur ; Xiaorui Li, Auteur ; Jingyi Li, Auteur ; Haihua Wang, Auteur ; Guiqiang Fei, Auteur Année de publication : 2017 Article en page(s) : p. 1315-1324 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Anticorrosion Copolymère ester acrylique Copolymères en émulsion Core-Shell Dispersions et suspensions Epoxydes Spectroscopie d'impédance électrochimique Index. décimale : 667.9 Revêtements et enduits Résumé : We first prepared an unsaturated epoxy resin ester (EM) by addition–esterification reaction with acrylic acid and then synthesized a series of acrylic ester/epoxy hybrid latexes (AE) with core–shell structure by semicontinuous emulsion polymerization method. The resultant AE emulsions are utilized as anticorrosion coatings of metals. The influences of EM content and crosslinking agent (PEG(400)DA) content on the physicochemical properties of the resultant emulsions and anticorrosion coatings of metals are investigated in detail. The AE emulsion displays better anticorrosion properties when it is prepared under the following conditions: the EM content of 30 wt% and PEG(400)DA content of 2.0 wt%. The relationships between the AE structure and anticorrosion properties of AE coatings are clearly illustrated. The corrosion resistances of AE coatings are not only depend on the crosslinking density, hydrophilic, and polarity among the AE chains, but also rely on the stability of the emulsion and the integrality and homogeneity of the coatings. Note de contenu : - EXPERIMENTAL : Materials - Synthesis of waterborne acrylic ester/epoxy core–shell emulsions - Preparation of the films - Preparation of samples - Measurements - RESULTS AND DISCUSSION : FTIR analysis - TEM - Effect of EM content - Effect of PEG(400)DA content DOI : 10.1007/s11998-017-9930-9 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-017-9930-9.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=29636 [article]

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Novel partially bio-based fluorinated polyimides from dimer fatty diamine for UV-cured coating / Jingcheng Liu in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 14, N° 6 (11/2017)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 14, N° 6 (11/2017) . - p. 1325-1334 Titre : Novel partially bio-based fluorinated polyimides from dimer fatty diamine for UV-cured coating Type de document : texte imprimé Auteurs : Jingcheng Liu, Auteur ; Kuan Wang, Auteur ; Yazhen Xie, Auteur ; Fei Gao, Auteur ; Qingtao Zeng, Auteur ; Yan Yuan, Auteur ; Ren Liu, Auteur ; Xiaoya Liu, Auteur Année de publication : 2017 Article en page(s) : p. 1325-1334 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Biomatériaux Fluoropolymères Polyimides Polymères -- Analyse Revêtements -- Séchage sous rayonnement ultraviolet Index. décimale : 667.9 Revêtements et enduits Résumé : A series of novel partially bio-based fluorinated polyimides with double-bond end groups (BGPIs) from 4,4′-(hexafluoroisopropylidene) diphthalic anhydride, 4,4′-(hexafluoroisopropylidene) dianiline, Priamine 1074, 4-aminobenzoic acid, and glycidyl methacrylate were synthesized via a copolycondensation method in m-cresol. The chemical structure and performances of BGPIs were fully characterized by Fourier transform infrared spectroscopy, proton nuclear magnetic resonance, gel permeation chromatography, solubility test, X-ray diffraction, and differential scanning calorimetry. It was determined that the prepared BGPIs were in the amorphous phase and readily soluble in conventional aprotic polar solvents. Additionally, the properties of as-prepared UV-cured coatings based on BGPIs were also evaluated by real-time Fourier transform infrared, thermogravimetric analysis, UV–Vis spectroscopy, and so on. Results revealed that all coatings exhibited satisfactory curing, higher adhesion, lower water uptakes, outstanding optical transparency, and fairly favorable thermal stability under a high content of biomass up to 48.9%. Therefore, these bio-based polymers could be considered as a potential sustainable candidate for high-temperature UV-curable coatings in the microelectronic field. Note de contenu : - EXPERIMENTAL SECTION : Materials - Synthesis of BGPIs with double-bond end groups - Preparation of UV-cured coatings based on BGPIs - The characterizations of BGPIs - The characterizations of UV-cured coatings based on BGPIs - RESULTS AND DISCUSSION : Structural characterization of BGPIs - Basic performances of BGPIs - Solubility of BGPIs - XRD analysis of BGPIs - DSC analysis of BGPIs - UV-curing behaviors of the coatings based on BGPIs - Transmittance of UV-cured coatings based on BGPIs - TGA analysis of UV-cured coatings based on BGPIs - Other performances of UV-cured coatings based on BGPIs DOI : 10.1007/s11998-017-9931-8 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-017-9931-8.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=29637 [article]

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Sol–gel preparation and characterization of antibacterial and self-cleaning hybrid nanocomposite coatings / Seyed Armin Zare Estekhraji in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 14, N° 6 (11/2017)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 14, N° 6 (11/2017) . - p. 1335-1343 Titre : Sol–gel preparation and characterization of antibacterial and self-cleaning hybrid nanocomposite coatings Type de document : texte imprimé Auteurs : Seyed Armin Zare Estekhraji, Auteur ; Sahar Amiri, Auteur Année de publication : 2017 Article en page(s) : p. 1335-1343 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Antibactériens Dioxyde de silicium Dioxyde de titane Matériaux hybrides Oxyde de zinc Revêtement auto-nettoyant Sol-gel, Procédé Index. décimale : 667.9 Revêtements et enduits Résumé : ZnO–TiO2, SiO2–TiO2, and SiO2–TiO2–ZnO hybrid nanocomposite coatings were synthesized based on sol–gel precursors including tetramethoxysilane (TMOS), 3-glycidoxypropyl trimethoxysilane (GPTMS), tetra(n-butyl orthotitanate) (TBT), and zinc acetate dihydrate. The hybrid network was characterized by FTIR, FESEM, and EDAX techniques. Results indicated that inorganic particles’ size was of nanoorder (20–30 nm), with very uniform distribution and dispersion. Photocatalytic and self-cleaning activities of these coatings were further investigated by degradation of methylene blue in an aqueous solution (20 ppm) at visible light irradiation, indicating photocatalytic performance of the coatings containing ZnO and TiO2 nanoparticles. The antibacterial effect of the coatings was investigated for inhibition and inactivation of cell growth, with the results showing the same antibacterial activity for ZnO–TiO2 and SiO2–TiO2–ZnO coatings against Escherichia coli and Staphylococcus aureus; the activity was, however, higher than that of SiO2–TiO2 hybrid nanocomposite coatings. Note de contenu : - EXPERIMENTAL : Materials - Synthesis of SiO2 nanoparticles - Synthesis of TiO2 nanoparticles - Synthesis of ZnO nanoparticles - Preparation of hybrid coatings - Preparation of substrates and coating technique - Characterization - Photocatalytic activity of coatings - Antibacterial efficiency - RESULTS AND DISCUSSION : FTIR results - Morphological and nanoparticle distribution results - Taber Abrasion analysis results - Self-cleaning and photocatalytic activity of coatings - Antibacterial activities of hybrid coatings DOI : 10.1007/s11998-017-9932-7 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-017-9932-7.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=29638 [article]

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The influence of moisture content on the polymer structure of polyvinyl alcohol in dispersion barrier coatings and its effect on the mass transport of oxygen / Ã…sa Nyflött in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 14, N° 6 (11/2017)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 14, N° 6 (11/2017) . - p. 1345-1355 Titre : The influence of moisture content on the polymer structure of polyvinyl alcohol in dispersion barrier coatings and its effect on the mass transport of oxygen Type de document : texte imprimé Auteurs : Ã…sa Nyflött, Auteur ; ÇaÄŸlar Meriçer, Auteur ; Matteo Minelli, Auteur ; Ellen Moons, Auteur ; Lars Järnström, Auteur ; Magnus Lestelius, Auteur ; Marco Giacinti Baschetti, Auteur Année de publication : 2017 Article en page(s) : p. 1345-1355 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Alcool polyvinylique Kaolin Matériaux -- Propriétés barrières Perméabilité Polymères -- Effets de l'humidité Index. décimale : 667.9 Revêtements et enduits Résumé : This paper presents a study of the effect of moisture on the gas permeability of polyvinyl alcohol (PVOH) and PVOH–kaolin dispersion barrier coatings. The oxygen permeability was measured at different humidity levels, and the material properties were characterized under the same conditions: polymer crystallinity, kaolin concentration, and kaolin orientation were all evaluated. The experimental results revealed that the water plasticizes the PVOH material of the coatings, and the presence of kaolin filler is unable to affect such behavior significantly. The PVOH crystallinity was affected drastically by the humidity, as water melts polymer crystallites, which is a reversible process under removal of water. The permeability data were analyzed using a thermodynamic-based model able to account for the water effect on both the solubility of the gas and the diffusivity coefficients in the polymer and composite. The results showed good agreement between the model’s predictions and the experimental data in terms of the overall permeability of the material. Note de contenu : - MATERIALS AND METHODS : Materials - Preparation of PVOH, kaolin dispersions and coatings - Permeability methods - Characterization of the material - RESULTS AND DISCUSSION : Characterization of the material - Permeability - Modeling permeability DOI : 10.1007/s11998-017-9937-2 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-017-9937-2.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=29639 [article]

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Stability and properties of waterborne polyurethane/clay nanocomposite dispersions / Mohamed Mizanur Rahman in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 14, N° 6 (11/2017)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 14, N° 6 (11/2017) . - p. 1357-1368 Titre : Stability and properties of waterborne polyurethane/clay nanocomposite dispersions Type de document : texte imprimé Auteurs : Mohamed Mizanur Rahman, Auteur Année de publication : 2017 Article en page(s) : p. 1357-1368 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Argile Dispersions et suspensions Encapsulation Polymères en émulsion Polyuréthanes Index. décimale : 667.9 Revêtements et enduits Résumé : Factors that can affect the stability of waterborne polyurethane (WBPU)/clay nanocomposite dispersions are reported. It is suggested that the dispersion stability depends on the carboxyl acid salt content, clay content, sonication (mechanical forces), and clay surface structure. It was observed that the dispersion stability increased with increasing carboxyl acid salt content after applying sonication (mechanical forces) in clay with OH groups (Cloisite 30B) up to 23.58 mol% DMPA. Encapsulated (WBPU20-30B4-M and WBPU23-30B5-M) clay in PU particles was formed using the above combination. The dispersion with clay encapsulated in PU particles had the longest storage time of all of the dispersions. The zeta potential, particle size, particle size distribution, and viscosity of the dispersions also depend on carboxyl acid salt content, clay content, sonication (mechanical forces), and clay surface structure. Note de contenu : - EXPERIMENTAL SECTION : Materials - Preparation of pristine WBPU dispersions - Preparation of WBPU/clay nanocomposite dispersions (Process A) - Preparation of WBPU/clay nanocomposite dispersions (Process B, Table 3) - Storage of WBPU/clay nanocomposite dispersions - Preparation of films - Characterization - RESULT AND DISCUSSION : Synthesis and identification - Stability of dispersion - TEM analysis - Zeta potential analysis - Particle size and particle size distribution analysis - Viscosity analysis DOI : 10.1007/s11998-017-9944-3 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-017-9944-3.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=29640 [article]

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A facile and low-cost preparation of durable amphiphobic coatings with fluoride–silica@poly(methacrylic acid) hybrid nanocomposites / Zheng-Bai Zhao in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 14, N° 6 (11/2017)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 14, N° 6 (11/2017) . - p. 1369-1380 Titre : A facile and low-cost preparation of durable amphiphobic coatings with fluoride–silica@poly(methacrylic acid) hybrid nanocomposites Type de document : texte imprimé Auteurs : Zheng-Bai Zhao, Auteur ; Da-Ming Zhang, Auteur ; Li Tai, Auteur ; Peng-Fei Jiang, Auteur ; Yong Jiang, Auteur Année de publication : 2017 Article en page(s) : p. 1369-1380 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Amphiphobie Hydrophobie Matériaux hybrides Oléophobie Revêtements Index. décimale : 667.9 Revêtements et enduits Résumé : Poor robustness, high cost and complicated preparation are the main barriers to the large-scale industrial application of amphiphobic coatings. A facile and low-cost method to fabricate durable amphiphobic coatings is reported in this work. The coatings were composed of top and bottom paints. The top paint was prepared by the F–Si@PMAA hybrid nanocomposites dispersion. The hybrid nanocomposites with dual structure were prepared via the co-condensation reaction of tetraethoxysilane (TEOS) and 1H,1H,2H,2H-Perfluorodecyl triethoxysilane (HDFTES) on the surface of the presynthesized PMAA nanoparticles in ethanol dispersion. The bottom one was a type of inexpensive car refinishing paint. The resulting coatings could be sprayed onto different substrates. All the coated substrates exhibited good amphiphobicity with superhydrophobicity with the water contact angle greater than 150°, water roll-off angle less than 4°, and high oleophobicity with the oil contact angle greater than 130°. Moreover, all of the prepared coatings exhibited great robustness after water jetting, sand abrasion, and knife scratching. This method can be an effective strategy for fabricating amphiphobic surfaces for practical industrial applications. Note de contenu : - EXPERIMENTAL : Materials - Preparation of F–Si@PMAA hybrid nanocomposites - Fabrication of amphiphobic films by spray coating - Measurement of surface morphology - Characterization of the rough dual structure of F–Si@PMAA hybrid nanocomposites - Measurement of water/oil wetting properties of the amphiphobic coatings - Measurement of mechanical robustness of the amphiphobic coatings - RESULTS AND DISCUSSIONS : Preparation of amphiphobic coatings - Durability of amphiphobic coatings - Micromorphology of hybrid nanocomposites and the influence on the amphiphobicity of the coatings - DOI : 10.1007/s11998-017-9940-7 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-017-9940-7.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=29641 [article]

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Rust morphology characterization of polyurethane and acrylic-based marine antifouling paints after salt spray test on scribed specimens / Evangelia D. Kiosidou in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 14, N° 6 (11/2017)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 14, N° 6 (11/2017) . - p. 1381-1395 Titre : Rust morphology characterization of polyurethane and acrylic-based marine antifouling paints after salt spray test on scribed specimens Type de document : texte imprimé Auteurs : Evangelia D. Kiosidou, Auteur ; Antonis Karantonis, Auteur ; Dimitrios I. Pantelis, Auteur ; Elisabete Ribeiro Silva, Auteur ; João Carlos Moura Bordado, Auteur Année de publication : 2017 Article en page(s) : p. 1381-1395 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Acier L'acier est un alliage métallique utilisé dans les domaines de la construction métallique et de la construction mécanique. L'acier est constitué d'au moins deux éléments, le fer, très majoritaire, et le carbone, dans des proportions comprises entre 0,02 % et 2 % en masse1. C'est essentiellement la teneur en carbone qui confère à l'alliage les propriétés du métal qu'on appelle "acier". Il existe d’autres métaux à base de fer qui ne sont pas des aciers comme les fontes et les ferronickels par exemple. Algues marines Anticorrosion Antimicrobiens Diffractométrie de rayons X Essais accélérés (technologie) Essais de brouillard salin Métaux -- Revêtements protecteurs Microscopie électronique à balayage Polyacryliques Polyuréthanes Revêtements antisalissures:Peinture antisalissures Revêtements organiques Spectroscopie Raman Index. décimale : 667.9 Revêtements et enduits Résumé : A newly developed, polyurethane-based, marine antifouling coating, containing 2% immobilized Econea, was examined in terms of its anticorrosion performance. The novelty of the experimental formulation arises from the immobilization of the biocide which minimizes leaching and was accomplished via a newly developed functionalization method, based on reaction of the biocide with highly reactive isocyanate functionality. The painting system was applied on steel specimens, then scribed with a sharp cutter and examined for 12 weeks in cyclic salt spray exposure. Identification of the rust morphologies was performed with XRD, Raman spectroscopy, SEM, and EDS methods. The absence of paint deformation during the experiment led to the formation of compact corrosion products, firmly adherent to the substrate, allowing transformation to more protective forms, such as oxides (hematite, maghemite, magnetite) and the least harmful of the oxyhydroxides (goethite, feroxyhyte), found in the mixture, ensuring sufficient corrosion protection. The unscratched part of the paint served as a barrier to corrosion product expansion beyond the scribed areas. An acrylic-based antifouling system was also examined for reasons of comparison. The experimental formulation exhibited superior anticorrosion performance overall, since the acrylic system presented extended material loss, blistering, checking, and extensive substrate rust coverage beneath the multilayer coat, implying unsatisfactory corrosion protection. Note de contenu : - EXPERIMENTAL METHODS AND MATERIALS : Coating systems examined - Accelerated aging tests on scribed specimens - SEM, XRD, and Raman examination of rust samples - RESULTS AND DISCUSSION : Observation of the scribed areas - XRD examination of rust samples - Raman spectra identification of rust samples - Identification of rust morphologies - Correlation of the observed rust morphologies with paint efficiency DOI : 10.1007/s11998-017-9939-0 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-017-9939-0.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=29642 [article]

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Corrosion protection by organic coatings containing polyaniline salts prepared by oxidative polymerization / M. Kohl in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 14, N° 6 (11/2017)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 14, N° 6 (11/2017) . - p. 1397-1410 Titre : Corrosion protection by organic coatings containing polyaniline salts prepared by oxidative polymerization Type de document : texte imprimé Auteurs : M. Kohl, Auteur ; A. Kalendova, Auteur ; E. ÄŒernoÅ¡ková, Auteur ; M. Bláha, Auteur ; J. Stejskal, Auteur ; M. Erben, Auteur Année de publication : 2017 Article en page(s) : p. 1397-1410 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Anticorrosifs Anticorrosion Corrosion Electrochimie Essais accélérés (technologie) Liants Polyalkydes Polyaniline Polymérisation par oxydation Revêtements -- Analyse:Peinture -- Analyse Revêtements -- Propriétés mécaniques:Peinture -- Propriétés mécaniques Revêtements organiques Revêtements protecteurs Index. décimale : 667.9 Revêtements et enduits Résumé : The aim of this work was to describe polyaniline salts synthesized and to assess the mechanical and anticorrosion properties of alkyd resin-based coating materials pigmented with them, in dependence on the pigment volume concentration and type. Polyaniline salts were prepared by oxidative polymerization in the solutions of inorganic (hydrochloric, phosphoric, and sulfuric) and organic (p-toluenesulfonic and 5-sulfosalicylic) acids. Polyaniline salts were characterized by thermal analysis and spectroscopic methods. Electrical conductivity was also measured by the van der Pauw method, and the molecular weight of the polyaniline was determined by gel permeation chromatography. Furthermore, the particle size of the solid salts was measured, and the morphology was studied by scanning electron microscopy. Subsequently, the parameters required to formulate pigmented organic coatings, i.e., density and critical pigment volume concentration were determined. A soybean oil-based fast drying alkyd resin of medium oil length was used as the binder for the organic coating material. Organic coatings containing the polyaniline salts at pigment volume concentrations 0%, 1%, 5%, 10%, and 15% were formulated and subjected to a standard accelerated cyclic corrosion tests. The organic coatings (paint films) were also subjected to mechanical tests and to the electrochemical test by potentiodynamic polarization studies. Note de contenu : - EXPERIMENTAL METHODS : Synthesis - Characterization - Formulation and preparation of the organic coatings - Mechanical properties of the paints - Corrosion studies - RESULTS AND DISCUSSION : Thermogravimetric analysis - Differential scanning calorimetry (DSC) - X-ray diffraction analysis - Infrared spectroscopy - Molecular weight - Conductivity - Particle size - Particle morphology - pH and electrical conductivity of aqueous extracts of the polyaniline salts and paint films - Density, oil absorption, and critical pigment volume concentration (CPVC) - Mechanical properties of the coating systems - Accelerated cyclic corrosion tests - Mechanism of corrosion protection by polyaniline coatings DOI : 10.1007/s11998-017-9942-5 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-017-9942-5.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=29643 [article]

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Synthesis and incorporation of poly(methyl methacrylate) microspheres with UV stabilizers in wood clear coating binder / Caroline Queant in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 14, N° 6 (11/2017)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 14, N° 6 (11/2017) . - p. 1411-1422 Titre : Synthesis and incorporation of poly(methyl methacrylate) microspheres with UV stabilizers in wood clear coating binder Type de document : texte imprimé Auteurs : Caroline Queant, Auteur ; Véronic Landry, Auteur ; Pierre Blanchet, Auteur ; Diane Schorr, Auteur Année de publication : 2017 Article en page(s) : p. 1411-1422 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Absorbeurs de rayonnement ultraviolet Bois -- Revêtements Encapsulation Essais accélérés (technologie) Liants Microsphères Polyacryliques Polyméthacrylate de méthyle Le poly(méthacrylate de méthyle) (souvent abrégé en PMMA, de l'anglais Poly(methyl methacrylate)) est un polymère thermoplastique transparent obtenu par polyaddition dont le monomère est le méthacrylate de méthyle (MMA). Ce polymère est plus connu sous son premier nom commercial de Plexiglas (nom déposé), même si le leader global du PMMA est Altuglas International9 du groupe Arkema, sous le nom commercial Altuglas. Il est également vendu sous les noms commerciaux Lucite, Crystalite, Perspex ou Nudec. Index. décimale : 667.9 Revêtements et enduits Résumé : The durability of clear coatings is an important problem in the coatings industry. This problem can be partly solved with the addition of UV absorbers (UVAs) in the coating formulation. UVAs can absorb part of the UV radiation and convert it into harmless heat. Organic UVAs are prone to photodegradation and can migrate in the binder of a coating formulation. In this study, commercial UVAs have been encapsulated in poly(methyl methacrylate) microspheres using the internal phase separation method. Microspheres have been incorporated into a clear acrylic binder. The acrylic was then applied on wood panels and was placed into an artificial UV chamber. Efficiency of coatings after aging as well as chemical and physical properties were monitored using a colorimeter, FTIR spectroscopy and transmission electron microscopy. This study presents a comparison between the efficiency of free and encapsulated Tinuvin 1130 and 292 commercial absorbers. Results have shown that the coating efficiency is slightly improved when using the encapsulated products. Note de contenu : - MATERIALS AND METHODS : Materials - Synthesis of PMMA microspheres with Tinuvin 1130 and Tinuvin 292 - Characterization techniques - Introduction in a commercial binder - Accelerated aging tests - Colorimeter - Film absorbance - FTIR - Diffusion tests - RESULTS AND DISCUSSION : DLS and microscopy - Accelerated aging tests results - Film absorbance - FTIR results - Diffusion tests DOI : 10.1007/s11998-017-9943-4 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-017-9943-4.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=29653 [article]

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Effect of sputtering parameters on the self-cleaning properties of amorphous titanium dioxide thin films in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 14, N° 6 (11/2017)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 14, N° 6 (11/2017) . - p. 1423-1433 Titre : Effect of sputtering parameters on the self-cleaning properties of amorphous titanium dioxide thin films Type de document : texte imprimé Année de publication : 2017 Article en page(s) : p. 1423-1433 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Couches minces Dioxyde de titane Hydrophilie Magnétron Matériaux amorphes Photocatalyse Pulvérisation Revêtement auto-nettoyant Index. décimale : 667.9 Revêtements et enduits Résumé : The aim of this work was to assess the effect of the direct current magnetron sputtering parameters on the photocatalytic activity and photoinduced wettability of amorphous TiO2 films. TiO2 films were deposited on glass using the direct current magnetron sputtering technique, without heating, at different total working pressures. Qualitative analysis using in situ X-ray photoelectron spectroscopy confirmed the TiO2 stoichiometry of the deposited films. Surface structure was studied as a function of working pressure using scanning electron microscopy. The hydrophilicity of the TiO2 surfaces was investigated macroscopically using measurements of the water contact angle. A threshold working pressure was observed, with a strong dependence on the film thickness. A super hydrophilic surface was observed after less than 1 h of UV irradiation. The photocatalytic activity of the films was evaluated under UV light through the degradation of methylene blue (λmax≈660nm). The effect of UV irradiation on the photocatalytic activity was rapid, strong, and dependent on film thickness and total working pressure. Fifty percent of organic compounds were photodegraded by films with a thickness of 60 nm deposited at 10 mTorr. Note de contenu : - EXPERIMENTAL DETAILS : Sample preparation - Contact angle measurements - Photocatalytic tests - X-ray photoelectron spectroscopic analysis - Characterization - RESULTS AND DISCUSSION : TiO2 film deposition - Structural characterization - Photoinduced superhydrophilicity - Photocatalytic activity DOI : 10.1007/s11998-017-9928-3 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-017-9928-3.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=29654 [article]

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Effect of vanadium additive and phosphating time on anticorrosion, morphology and surface properties of ambient temperature zinc phosphate conversion coatings on mild steel / Abbasi Mehrdad in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 14, N° 6 (11/2017)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 14, N° 6 (11/2017) . - p. 1435-1445 Titre : Effect of vanadium additive and phosphating time on anticorrosion, morphology and surface properties of ambient temperature zinc phosphate conversion coatings on mild steel Type de document : texte imprimé Auteurs : Abbasi Mehrdad, Auteur ; M. M. Attar, Auteur Année de publication : 2017 Article en page(s) : p. 1435-1445 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Acier L'acier est un alliage métallique utilisé dans les domaines de la construction métallique et de la construction mécanique. L'acier est constitué d'au moins deux éléments, le fer, très majoritaire, et le carbone, dans des proportions comprises entre 0,02 % et 2 % en masse1. C'est essentiellement la teneur en carbone qui confère à l'alliage les propriétés du métal qu'on appelle "acier". Il existe d’autres métaux à base de fer qui ne sont pas des aciers comme les fontes et les ferronickels par exemple. Caractérisation Métaux -- Revêtements protecteurs Phosphate de zinc Revêtement métallique Vanadium Le vanadium est un élément chimique, de symbole V et de numéro atomique 23. C'est un métal rare, dur et ductile que l'on trouve dans certains minerais. Il est principalement utilisé dans les alliages. Il possède une bonne résistance à la corrosion par les composés alcalins, ainsi qu'aux acides chlorhydrique et sulfurique. Il s'oxyde rapidement à environ 933 K. Le vanadium possède une bonne force structurelle ainsi qu'une faible section efficace d'interaction avec les neutrons de fission, ce qui le rend utile dans les applications nucléaires. C'est un métal qui présente à la fois des caractéristiques acide et basique. Index. décimale : 667.9 Revêtements et enduits Résumé : An attempt has been made to investigate the effect of phosphating time and vanadium additive on the anticorrosion and surface properties of ambient temperature zinc phosphate coatings. Zinc phosphate coatings with different phosphating times and vanadium concentrations were applied to low carbon steel samples. A potentiostatic polarization test in 3.5 wt% NaCl solution was carried out to investigate the electrochemical properties of coated samples. Field emission scanning electron microscopy, energy-dispersive spectroscopy, and atomic force microscopy were utilized to evaluate the microstructure, chemistry and roughness of coatings. Surface properties such as wettability, surface tension, and work of adhesion were measured. Results indicate that the sample which was immersed for 30 min in the phosphating bath exhibits the lowest corrosion current density, one tenth of bare steel, due to formation of a compact coating while having a low number of microcracks. Addition of 500 ppm vanadium to the coating in a secondary bath decreases the corrosion rate of zinc phosphate coating remarkably, by almost 80%. Microstructural results reveal that vanadium-rich precipitates are formed and enhance the coating coverage on the steel substrate. Vanadium addition increases the surface roughness, surface free energy, and work of adhesion of the phosphate coating. Note de contenu : - EXPERIMENTAL PROCEDURE : Materials and sample preparation - Methods - RESULTS AND DISCUSSION : EBSD results - Potentiostatic polarization measurements - Open-circuit potential (OCP) measurements - SEM/EDS results - AFM results - Contact angle results DOI : 10.1007/s11998-017-9960-3 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-017-9960-3.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=29655 [article]

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Regression modeling of solid mottle in coated papers / Akshay V. Joshi in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 14, N° 6 (11/2017)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 14, N° 6 (11/2017) . - p. 1447-1456 Titre : Regression modeling of solid mottle in coated papers Type de document : texte imprimé Auteurs : Akshay V. Joshi, Auteur Année de publication : 2017 Article en page(s) : p. 1447-1456 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse de variance En statistique, l'analyse de la variance (terme souvent abrégé par le terme anglais ANOVA : ANalysis Of VAriance) est un ensemble de modèles statistiques utilisés pour vérifier si les moyennes des groupes proviennent d'une même population. Les groupes correspondent aux modalités d'une variable qualitative (p. ex. variable : traitement; modalités : programme d'entrainement sportif, suppléments alimentaires ; placebo) et les moyennes sont calculés à partir d'une variable continue (p. ex. gain musculaire). Ce test s'applique lorsque l'on mesure une ou plusieurs variables explicatives catégorielles (appelées alors facteurs de variabilité, leurs différentes modalités étant parfois appelées "niveaux") qui ont de l'influence sur la loi d'une variable continue à expliquer. On parle d'analyse à un facteur lorsque l'analyse porte sur un modèle décrit par un seul facteur de variabilité, d'analyse à deux facteurs ou d'analyse multifactorielle sinon. (Wikipedia) Emballages Héliogravure Papier enduit Plan d'expérience Index. décimale : 667.9 Revêtements et enduits Résumé : The print industry has observed an exponential growth over the last decade. A shift from plastics to paper has been observed in the packaging industry due to its sustainability. The gravure process dominates the packaging industry because of long runs and high print precision. This work focuses on the effect of gravure process parameters on print mottle for 50 GSM (gram/square meters) and 65 GSM (gram/square meters) C1S (coated-one-side) paper. Solid mottle refers to unevenness in print density and occurs due to variations in substrate, ink, and process parameters degrading the print quality, thereby resulting in printed wastage and loss to an organization. The intricate mechanism of ink transfer in the gravure process needs to be studied in depth so as to deliver higher yield and lower print waste. The Stochastic Frequency Distribution Analysis (SFDA) algorithm was used to measure the print mottle. The design of experiments (DOE) was run for gravure process parameters such as line screen, viscosity, press speed, electrostatic assist (ESA) voltage, and air gap (distance between impression roller and charge bar) at varying levels. The experimental data were analyzed through analysis of variance (ANOVA), main plot, and interaction plot. The analysis revealed significance of all process parameters for minimization of solid mottle. The optimized settings showed reduction in solid mottle by 64.68% and 67.78% for 50 GSM and 65 GSM, respectively. A stepwise regression model was developed to predict the print mottle that showed correlation coefficient of 0.912 and 0.938 for 50 GSM and 65 GSM C1S papers. This work could serve as a framework to maintain operating levels of gravure process for minimization of solid mottle. Note de contenu : - MATERIALS AND METHODS : Substrate - Ink-substrate interaction - Design layout - Experimental process - Sampling and measurement technique - RESULTS AND DISCUSSION : Print mottle DOI : 10.1007/s11998-017-9967-9 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-017-9967-9.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=29656 [article]

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Preparation of 2,5-bis(methylallyl thioester)-thiadiazole with high refractive index and its coatings / Shuqian Zhou in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 14, N° 6 (11/2017)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 14, N° 6 (11/2017) . - p. 1457-1461 Titre : Preparation of 2,5-bis(methylallyl thioester)-thiadiazole with high refractive index and its coatings Type de document : texte imprimé Auteurs : Shuqian Zhou, Auteur ; Yajun Mao, Auteur ; Zhengfa Zhou, Auteur ; Weibing Xu, Auteur ; Haihong Ma, Auteur ; Fengmei Ren, Auteur ; Haiyang Zhu, Auteur Année de publication : 2017 Article en page(s) : p. 1457-1461 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Adhésion Dithiazole Dureté (matériaux) Photoréticulation Polyéthylène téréphtalate Réfraction, Indice de Revêtements Stabilité thermique Thioester Les thioesters - aussi dénommés esters sulfuriques - sont des composés résultant de la condensation d'un sulfure avec un groupement acyle. La formule générale d'un thioester est R−C(=O)-S-R'. Ils sont le produit de l'estérification d'un acide carboxylique avec un thiol (et non avec un alcool comme dans les esters classiques). Les thioesters sont avant tout connus par leur mauvaise odeur caractéristique. Christian de Duve leur attribue un rôle clé à propos de l'apparition de la vie. Transparence (optique) Index. décimale : 667.9 Revêtements et enduits Résumé : New high refractive index monomer of 2,5-bis(methylallyl thioester)-thiadiazole (BMATETDZ) containing thioester and dithiazole was synthesized by a one-step condensation reaction with methyl acryloyl chloride and 2,5-dimercaptothiadiazole (DTD). N–N=(C), C=O, and C–S with high molar refraction groups were introduced into the structure of BMATETDZ. FTIR and 1H NMR were used to characterize the molecular structure of BMATETDZ. The refractive index of BMATETDZ was 1.661. The coatings of poly (2,5-bis(methylallyl thioester)-thiadiazole) (C-PBMATETDZ) on polyethylene terephthalate (PET) film were prepared by photopolymerization under UV irradiation. The C-PBMATETDZ coatings exhibited better comprehensive properties with high refractive index, high hardness, good adhesive force, excellent thermal stability, and high transparency in range of 200–900 nm. Note de contenu : - EXPERIMENTAL METHODS AND MATERIALS : Material and sample preparation - Characterization - RESULTS AND DISCUSSION : Synthesis of BMATETDZ - FTIR of BMATETDZ - Optical properties of BMATETDZ and C-PBMATETDZ - Mechanical and thermodynamic properties of C-PBMATETDZ DOI : 10.1007/s11998-017-9959-9 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-017-9959-9.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=29657 [article]

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