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Oxazoline-based crosslinking reaction for coatings / Philipp Knospe in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 5 (09/2021)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 18, N° 5 (09/2021) . - p. 1199-1207 Titre : Oxazoline-based crosslinking reaction for coatings Type de document : texte imprimé Auteurs : Philipp Knospe, Auteur ; Patrick Böhm, Auteur ; Jochen S. Gutmann, Auteur ; Michael Dornbusch, Auteur Année de publication : 2021 Article en page(s) : p. 1199-1207 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse thermomécanique dynamique Auto-réticulation Catalyseurs Oxazoline Polyisocyanates Polyuréthanes Réseaux polymères Réticulants Revêtements organiques Index. décimale : 667.9 Revêtements et enduits Résumé : Nowadays, coating materials must meet high demands in terms of mechanical, chemical and optical properties in all areas of application. Amongst others, amines and isocyanates are used as crosslinking components for curing reactions, meeting the highly demanding properties of the coatings industry. In this work, a new crosslinking reaction for coatings based on oxazoline chemistry is investigated with the objective to overcome disadvantages of established systems and fulfill the need for sustainable coating compounds. The oxazoline-group containing resin, synthesized from commercially available substances, undergoes cationic self-crosslinking polymerization to build up a network based on urethane and amide moieties. NMR-, IR- and ES-mass spectroscopy are suitable techniques to characterize the synthesized oxazoline monomers, which are linked to polyisocyanates and polymerized afterwards via self-polymerization. The progress of crosslinking is followed by changes in IR spectra and by rheological measurements to calculate time dependent values for storage and loss modulus. The glass transition temperature of the resulting coating is determined, too. Furthermore, sol–gel-analysis is performed to determine the degree of crosslinking. After application on steel and aluminium panels, application tests are performed. In addition to excellent adhesion to the substrate, the polymer network shows promising mechanical properties and with that it could represent a new technology for the coatings industry. Note de contenu : - Raw materials - Analytical methods - Synthesis of the compounds - Polyisocyanate-oxazoline adduct 2 - Application testing - Table 1 : Screening of different catalysts using curing temperatures 190°C and 160°C - Table 2 : Coating properties at different curing temperatures using various catalysts DOI : https://doi.org/10.1007/s11998-021-00479-9 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00479-9.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36425 [article]

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Corrosion-resistant composite coatings based on a graphene oxide–metal oxide/urushiol formaldehyde polymer system / Lei Zhang in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 5 (09/2021)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 18, N° 5 (09/2021) . - p. 1209-1225 Titre : Corrosion-resistant composite coatings based on a graphene oxide–metal oxide/urushiol formaldehyde polymer system Type de document : texte imprimé Auteurs : Lei Zhang, Auteur ; Wupin Wang, Auteur ; Haitang Wu, Auteur ; Zeyu Zheng, Auteur ; Ming Wei, Auteur ; Xiaohua Huang, Auteur Année de publication : 2021 Article en page(s) : p. 1209-1225 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Anticorrosifs Anticorrosion Bases (chimie) Copolymère urushiol formaldéhyde Dioxyde de titane Métaux -- Revêtements protecteurs Oxyde d'yttrium Oxyde de graphène Résistance chimique Revêtements organiques Silice La silice est la forme naturelle du dioxyde de silicium (SiO2) qui entre dans la composition de nombreux minéraux. La silice existe à l'état libre sous différentes formes cristallines ou amorphes et à l'état combiné dans les silicates, les groupes SiO2 étant alors liés à d'autres atomes (Al : Aluminium, Fe : Fer, Mg : Magnésium, Ca : Calcium, Na : Sodium, K : Potassium...). Les silicates sont les constituants principaux du manteau et de l'écorce terrestre. La silice libre est également très abondante dans la nature, sous forme de quartz, de calcédoine et de terre de diatomée. La silice représente 60,6 % de la masse de la croûte terrestre continentale. Index. décimale : 667.9 Revêtements et enduits Résumé : Composite coatings were fabricated based on a graphene oxide–metal oxide/urushiol formaldehyde polymer (GO–TiO2/UFP, GO–SiO2/UFP and GO–Y2O3/UFP) system with modifications, and its effectiveness in corrosion protection of metal substrates was demonstrated. First, a GO–TiO2 composite was synthesized using titanium dioxide loading on GO via 3-aminopropyltriethoxysilane (APTES). The GO–Y2O3 composite was synthesized using nano-yttrium oxide intercalating into GO through two different silane coupling agents. The GO–SiO2 composite was synthesized via an in-situ two-step sol-gel process utilizing APTES and tetraethylorthosilicate (TEOS) in an aqueous ethanol solution. The morphology and structure of the GO–metal oxide composites (GO–TiO2, GO–Y2O3 and GO–SiO2) were studied. Subsequently, GO–metal oxides were incorporated into UFP to investigate the composite’s effectiveness in corrosion protection of metal substrates. Compared with GO–TiO2/UFP and GO–Y2O3/UFP, GO–SiO2/UFP showed superior alkali-resistance enhancing performance. Additionally, GO crosslinked with APTES–TiO2 via covalent bonds and the well-dispersed GO–TiO2 in UFP improved the electrochemical corrosion properties of the UFP coatings, most likely due to the obstruction of the diffusion pathways inside the UFP coating matrix, thus preventing the diffusion of penetrating species. It was revealed that the corrosion resistance of GO–TiO2/UFP composite coating was noticeably higher than GO–SiO2/UFP and GO–Y2O3/UFP composite coatings. Note de contenu : - MATERIALS AND METHODS : Materials - Fabrication process of the composite coatings - Characterization of composite coatings - Analysis of chemical resistance properties - RESULTS AND DISCUSSION : FTIR analysis - Microstructure and chemical composition of GO–metal oxide in UFP - XRD analysis - XPS analysis - Electrochemical tests - Chemical resistance of the UFP composite coatings - Corrosion protection mechanism - Table 1 : The XPS results for the GO–TiO2, GO–Y2O3 and GO–SiO2 sample - Table 2 : Electrochemical parameters obtained from the polarization curves of the UFP coatings containing different contents of GO–TiO2, GO–Y2O3, GO–SiO2 and MGO - Table 3 : Electrochemical parameters obtained from the EIS spactra of the UFP coatings containing different contents of GO–TiO2, GO–Y2O3 and GO–SiO2 - Table 4 : Resistance of the GO–TiO2/UFP, GO–Y2O3/UFP and GO–SiO2/UFP composite coatings against chemical attack after immersion in 30% H2SO4, 10% NaOH and 3% NaCl solution at room temperature DOI : https://doi.org/10.1007/s11998-021-00480-2 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00480-2.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36426 [article]

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Preparation of alkali-resistant aluminum pigment encapsulated with fluoropolymer by in situ polymerization / Pengchao Men in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 5 (09/2021)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 18, N° 5 (09/2021) . - p. 1227-1235 Titre : Preparation of alkali-resistant aluminum pigment encapsulated with fluoropolymer by in situ polymerization Type de document : texte imprimé Auteurs : Pengchao Men, Auteur ; Jihong Liang, Auteur ; Jinxuan He, Auteur ; Jian Chen, Auteur ; Bing Geng, Auteur ; Wei Li, Auteur Année de publication : 2021 Article en page(s) : p. 1227-1235 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Aluminium L'aluminium est un élément chimique, de symbole Al et de numéro atomique 13. C’est un métal pauvre, malléable, de couleur argent, qui est remarquable pour sa résistance à l’oxydation13 et sa faible densité. C'est le métal le plus abondant de l'écorce terrestre et le troisième élément le plus abondant après l'oxygène et le silicium ; il représente en moyenne 8 % de la masse des matériaux de la surface solide de notre planète. L'aluminium est trop réactif pour exister à l'état natif dans le milieu naturel : on le trouve au contraire sous forme combinée dans plus de 270 minéraux différents, son minerai principal étant la bauxite, où il est présent sous forme d’oxyde hydraté dont on extrait l’alumine. Il peut aussi être extrait de la néphéline, de la leucite, de la sillimanite, de l'andalousite et de la muscovite. L'aluminium métallique est très oxydable, mais est immédiatement passivé par une fine couche d'alumine Al2O3 imperméable de quelques micromètres d'épaisseur qui protège la masse métallique de la corrosion. On parle de protection cinétique, par opposition à une protection thermodynamique, car l’aluminium reste en tout état de cause très sensible à l'oxydation. Cette résistance à la corrosion et sa remarquable légèreté en ont fait un matériau très utilisé industriellement. L'aluminium est un produit industriel important, sous forme pure ou alliée, notamment dans l'aéronautique, les transports et la construction. Sa nature réactive en fait également un catalyseur et un additif dans l'industrie chimique ; il est ainsi utilisé pour accroître la puissance explosive du nitrate d'ammonium. Anticorrosifs Anticorrosion Bases (chimie) Caractérisation Encapsulation Fluoropolymères Pigments métalliques Polyméthacrylate de trifluoroéthyle Résistance chimique Revêtements:Peinture Index. décimale : 667.9 Revêtements et enduits Résumé : Flaky aluminum pigments with excellent corrosion resistance have found applications in diverse fields. In this study, a fluoropolymer has been incorporated in the aluminum pigment to effectively enhance its corrosion resistance, along with the improvement in the chemical resistance and thermal stability. Specifically, a uniform dense layer of poly(trifluoroethyl methacrylate) (PTFEMA) has been directly coated on the surface of the flaky aluminum pigment by in situ polymerization. The encapsulated aluminum pigment exhibited high stability upon dipping in the alkaline solution (pH = 13) due to protection imparted by the fluoropolymer layer. The morphology of the fluoropolymer layer on the surface of the aluminum pigment was characterized by scanning electron microscopy (SEM). Moreover, the thermal stability of the encapsulated aluminum pigment was analyzed by thermogravimetric analysis (TG). The structure and composition of the fluoropolymer layer were further characterized by Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS). The stability of the aluminum pigment in alkaline aqueous media was investigated via hydrogen evolution experiments. Overall, the corrosion resistance of the aluminum pigment encapsulated with fluoropolymer was observed to be markedly improved owing to the presence of the PTFEMA layer. Note de contenu : - EXPERIMENTAL : Materials - Synthesis of PTFEMA/Al - Characterization - RESULTS AND DISCUSSION : Characterization of the raw aluminum and PTFEMA/Al particles by SEM - Characterization of the raw Al and PTFEMA/Al particles by FTIR - Characterization of the raw Al and PTFEMA/Al particles by XPS - Characterization of the raw Al and PTFEMA/Al particles by TG - The effect of TFEMA and TMPTMA on the anticorrosion properties of modified aluminum powder - Spraying of the metallic paint containing the aluminum pigment DOI : https://doi.org/10.1007/s11998-021-00481-1 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00481-1.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36427 [article]

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Functional properties of zinc-nanographite based nanocomposite paints for 2–9 GHz microwave absorption / Anjali Prakash in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 5 (09/2021)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 18, N° 5 (09/2021) . - p. 1237-1243 Titre : Functional properties of zinc-nanographite based nanocomposite paints for 2–9 GHz microwave absorption Type de document : texte imprimé Auteurs : Anjali Prakash, Auteur ; Saranya Narayanan, Auteur ; Kesavamurthy Thangavelu, Auteur ; Avanish K. Srivastava, Auteur ; Mritunjay Kumar Pandey, Auteur ; Ramamoorthy Nagarajan, Auteur ; Amitava Bhattacharyya, Auteur Année de publication : 2021 Article en page(s) : p. 1237-1243 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation Graphite Matériaux -- Propriétés fonctionnelles Matériaux hybrides Micro-ondes Morphologie (matériaux) Nanoparticules Ondes électromagnétiques -- Absorption Revêtements:Peinture Rhéologie Zinc Index. décimale : 667.9 Revêtements et enduits Résumé : Nanographite-zinc particles in various ratios were synthesized by high energy ball milling and dispersed in epoxy based aero grade resins for studying their microwaves absorption in the lower frequency band of 2–9 GHz using a coaxial waveguide measurement system. Morphological characterizations of the synthesized particles showed that shuttle shaped zinc is well embedded on the exfoliated nanographite particles without any agglomeration. The higher interfacial polarization of both the graphite and zinc particles contributes to the excellent electrical conductivity and hence refers it as an ideal microwave absorber in defense applications. The paint with 20% (w/v) loading of nanographite-zinc (1:1 ratio) particles is proficient in providing microwave absorption of − 18.06 dB at 8.19 GHz with a coating thickness of 1.43 mm. Note de contenu : - MATERIALS AND METHODS - CHARACTERIZATION - RESULTS AND DISCUSSION : Morphological analysis and microstructure of samples - Rheological properties and behavior - Electromagnetic characteristics and microwave absorption properties - Table 1 : Thickness of the Al sheets after final sample coating - Table 2 : Major X-ray peaks observed in accordance with the Joint Committee on Powder Diffraction Standards database - Table 3 : Weight percentage of carbon, zinc, and oxygen in each powder sample as per EDAX data DOI : https://doi.org/10.1007/s11998-021-00484-y En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00484-y.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36428 [article]

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The preparation of superhydrophobic photocatalytic fluorosilicone/SiO2–TiO2 coating and its self-cleaning performance / Lijun Zong in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 5 (09/2021)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 18, N° 5 (09/2021) . - p. 1245-1259 Titre : The preparation of superhydrophobic photocatalytic fluorosilicone/SiO2–TiO2 coating and its self-cleaning performance Type de document : texte imprimé Auteurs : Lijun Zong, Auteur ; Yaping Wu, Auteur ; Xingeng Li, Auteur ; Bo Jiang, Auteur Année de publication : 2021 Article en page(s) : p. 1245-1259 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation Dioxyde de silicium Dioxyde de titane Fluorosilicones Hydrophobie Photocatalyse Revêtement auto-nettoyant Revêtements organiques Index. décimale : 667.9 Revêtements et enduits Résumé : Nanographite-zinc particles in various ratios were synthesized by high energy ball milling and dispersed in epoxy based aero grade resins for studying their microwaves absorption in the lower frequency band of 2–9 GHz using a coaxial waveguide measurement system. Morphological characterizations of the synthesized particles showed that shuttle shaped zinc is well embedded on the exfoliated nanographite particles without any agglomeration. The higher interfacial polarization of both the graphite and zinc particles contributes to the excellent electrical conductivity and hence refers it as an ideal microwave absorber in defense applications. The paint with 20% (w/v) loading of nanographite-zinc (1:1 ratio) particles is proficient in providing microwave absorption of − 18.06 dB at 8.19 GHz with a coating thickness of 1.43 mm. Note de contenu : - EXPERIMENTAL SECTION : Materials - Sample preparation - Sample characterization - RESULTS AND DISCUSSION : Effects of TiO2 addition amount on the wettability change - Effects of SiO2 addition amount on the wettability change - Photocatalytic degradation performances - Morphology characteristic analysis and the self-cleaning performance - Table 1 : The surface roughness, microstructure, hydrophilic transition under UV, and photocatalytic performance of prepared coatings - Table 2 : The pollution performance and hydrophobicity recovery of three typical coatings with different surface characteristics DOI : https://doi.org/10.1007/s11998-021-00485-x En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00485-x.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36429 [article]

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Coating of hydrophilic poly(hydroxypropyl methacrylate) thin films via pulsed-initiated chemical vapor deposition method / Emine Sevgili Mercan in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 5 (09/2021)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 18, N° 5 (09/2021) . - p. 1261-1268 Titre : Coating of hydrophilic poly(hydroxypropyl methacrylate) thin films via pulsed-initiated chemical vapor deposition method Type de document : texte imprimé Auteurs : Emine Sevgili Mercan, Auteur ; Mustafa Karaman, Auteur Année de publication : 2021 Article en page(s) : p. 1261-1268 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation Dépôt chimique en phase vapeur Hydrophilie Polyméthacrylate d'hydroxypropyle Revêtements organiques Index. décimale : 667.9 Revêtements et enduits Résumé : This study demonstrates the coating of poly(hydroxypropyl methacrylate) (PHPMA) thin films from the corresponding monomer HPMA using pulsed-initiated chemical vapor deposition (pulsed-iCVD) method. The advantages of pulsing the power delivered to the filament wires during iCVD through successive on–off duty cycles (DC) are outlined by considering the deposition rates, structure, and morphology of as-deposited PHPMA films. FTIR and XPS analysis of the as-deposited films verifies that pulsing the filament power produces thin films of PHPMA, which is structurally very similar to that synthesized using classical continuous power iCVD. However, there is up to 70% increase in deposition rate upon pulsing the filament power in comparison with the continuous power iCVD. AFM analysis of the as-deposited films shows that the film morphology can be controlled by varying the DC during pulsed-iCVD. At a DC of 85.7%, the most hydrophilic film is observed with a measured water contact angle of 31°. Note de contenu : - EXPERIMENTAL : Materials - Pulsed iCVD of PHPMA thin films - Characterization of the as-deposited thin films - RESULTS AND DISCUSSION : Deposition kinetics - Structure and morphology of as-deposited films - Table 1: Experimental conditions - Table 2 : Average (Tavrg) and minimum (Tmin) filament temperature values in different duty cycle percentages (FRHPMA=0.5 sccm, FRTBPO=1 sccm, Ts=30°C, P=170 mtorr) DOI : https://doi.org/10.1007/s11998-021-00486-w En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00486-w.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36430 [article]

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Effect of filler content on scratch behavior and tribological performance of polyester/graphene oxide nanocomposite coating / Nedia Gafsi in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 5 (09/2021)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 18, N° 5 (09/2021) . - p. 1269-1280 Titre : Effect of filler content on scratch behavior and tribological performance of polyester/graphene oxide nanocomposite coating Type de document : texte imprimé Auteurs : Nedia Gafsi, Auteur ; Raquel Verdejo, Auteur ; Mohamed Kharrat, Auteur ; Massimiliano Barletta, Auteur ; Miguel Ángel López-Manchado, Auteur ; Maher Dammak, Auteur Année de publication : 2021 Article en page(s) : p. 1269-1280 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Charges (matériaux) Enrobage (technologie) Essais de résilience Frottements (mécanique) Matériaux hybrides Polyesters Rayures Revêtements organiques Tribologie (technologie) Index. décimale : 667.9 Revêtements et enduits Résumé : The influence of 0.5, 0.75, and 1 wt.% of graphene oxide (GrO) in nanocomposite coating on scratch behavior and tribological performance was analyzed. Graphite was oxidized using the Marcano and Tour method to obtain graphite oxide, which is thermally exfoliated at 700°C getting graphene oxide. The transformation of graphite to graphene oxide was evaluated via Raman spectroscopy and X-ray diffraction. Effects of graphene oxide content on the friction and wear behavior of polyester composite coatings were evaluated under dry sliding conditions. Experimental findings showed that the addition of 0.5 wt.% GrO was effective in reducing the friction coefficient of polyester coating. Meanwhile, under the same sliding conditions, the wear results revealed that the polyester coating filled with 1 wt.% GrO has better antiwear ability compared to those filled with 0.5 and 0.75 wt.% GrO. From the scratch analyses, we deduced that coating scratch behavior was highly affected by the amount of fillers inside the polyester matrix. In fact, the best friction characteristic and scratch resistance were observed in the case of polyester coatings filled with the lower amount of GrO, namely 0.5 wt.%. Note de contenu : - EXPERIMENTAL DETAILS : Materials - The synthesizing process of graphene oxide - Physico-chemical characterization methods for matrix and fillers - Tribological and scratch characterization - Methodologies - RESULTS AND DISCUSSION : Fillers characterization - Tribological behavior - Scratch test analysis - Table 1 : Chemical composition and the mechanical properties of aluminum alloyTable 2 Residual depth and scratch hardness versus fillers content for polyester/GrO nanocomposite coatings - Table 2 : Residual depth and scratch hardness versus fillers content for polyester/GrO nanocomposite coatings DOI : https://doi.org/10.1007/s11998-021-00489-7 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00489-7.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36431 [article]

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Best pigment coating for a dual-purpose coated paper / Jae Y. Shin in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 5 (09/2021)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 18, N° 5 (09/2021) . - p. 1281-1294 Titre : Best pigment coating for a dual-purpose coated paper Type de document : texte imprimé Auteurs : Jae Y. Shin, Auteur ; Paul D. Fleming, Auteur ; Hak Lae Lee, Auteur Année de publication : 2021 Article en page(s) : p. 1281-1294 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Argile Emballages Formes des particules Impression jet d'encre Latex Liants Offset (imprimerie) Papier et carton couché Perméabilité Pigments Index. décimale : 667.9 Revêtements et enduits Résumé : Dual-purpose coated paper, which enables in-line inkjet printing with web offset, can be used for both offset and inkjet prints. This product has potential to meet the ever-increasing demand for printing individualized information on commercial printing materials. In this work, commercial samples were printed in the two presses. It was deduced that low permeability correlates with large color gamut volume. The correlation would be useful to design coating formulations for good printability. Also, we examined the packing of coating layers to identify a coating formulation that provides good printing quality in both offset and inkjet printing. Many combinations of pigments were tested, and the effects of particle shape on viscosity and packing were examined. For all coating colors, pigment mixtures with a weight ratio of 3:1 gave the highest packing density. The mixture of GCC 90 and delaminated clay with a weight ratio of 3:1 was the best selection studied for dual-purpose coated paper. Among commercial paper samples, a web offset coated paper showed the best overall performance, indicating that coating formulations with minimal blistering are suitable for dual-purpose coated paper. Note de contenu : - MATERIALS AND METHODS : Commercial coated papers - Permeability (K) of commercial papers - Pigments and a binder latex - Coating formulations for dual-purpose coated paper - Field-emission scanning electron microscopy images of pigments and coated papers, and paper testing - Color reproduction - Coating color properties - The application of packing theory to paper coating - RESULTS AND DISCUSSION : Trials of precommercial dual-purpose coated papers - Effect of particle shape on viscosity - Effect of particle shape on packing - Correlation between packing volume and surface properties - Table 1 Physical properties of commercial coated papers for offset, inkjet, and dual-purpose printing - Table 2 Characteristics of coating pigments and a binder latex - Table 3 Color gamut volumes and four-color optical ink densities of commercial coated papers - Table 4 Packing volume fractions of pigment-only dispersions and pigment–latex dispersions. Calcium carbonates and clays are assumed to have an equal density of 2.7 g/m3 so that weight (λw) and volume (λv) ratios are the same in pigment-only dispersions DOI : https://doi.org/10.1007/s11998-021-00491-z En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00491-z.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36432 [article]

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A novel waterborne fluorinated polyurethane–acrylate film for ultraviolet blocking and antiprotein fouling in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 5 (09/2021)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 18, N° 5 (09/2021) . - p. 1295-1307 Titre : A novel waterborne fluorinated polyurethane–acrylate film for ultraviolet blocking and antiprotein fouling Type de document : texte imprimé Année de publication : 2021 Article en page(s) : p. 1295-1307 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Absorbeurs de rayonnement ultraviolet Angle de contact Caractérisation Copolymère uréthane acrylate Copolymères en émulsion Fluor Humidité -- Absorption:Eau -- Absorption Revêtements -- Propriétés chimiques Revêtements -- Propriétés physiques Revêtements antisalissures:Peinture antisalissures Revêtements organiques Revêtements protecteurs Tension superficielle Index. décimale : 667.9 Revêtements et enduits Résumé : Waterborne polyurethane–acrylate (WPUA) as a surface protective coating has been widely used in industrial, architectural, and textile applications. To extend the application of WPUA in the biological field, a novel ultraviolet-fluorinated waterborne polyurethane–acrylate (UV-WFPUA) film, which contains 2, 4-dihydroxybenzophenone (DHBP) as the ultraviolet (UV) absorber and dodecafluoroheptyl methacrylate (DFMA) as the fluorine monomer, was prepared. The paper discussed the effect of UV absorber and fluorine monomer on the UV adsorption performance, thermo-stability, and physical and mechanical properties of the UV-WFPUA film. Furthermore, it explored the independent and cooperative effects of UV absorber and fluorine monomer in affecting the antiprotein fouling property on a quantitative level. Results show that the antiprotein fouling performance of UV-WFPUA film significantly weakened after adding 0.4 wt.% DHPB since the average protein concentration increased from 0.14 to 0.37 mg/mL. In contrast, after adding 9 wt.% DFMA, the average protein concentration dropped from 0.37 to 0.13 mg/mL, indicating the antiprotein fouling properties improved. Therefore, the addition of fluorine monomer will contribute to antiprotein fouling and eliminate the adhesion of UV absorber with proteins. The excellent antiprotein fouling, thermal, and optical properties endow the waterborne polyurethane–acrylate films with promising applications in corneal contact lenses or intraocular lenses. Note de contenu : - EXPERIMENTAL : Materials - Preparation of UV-WFPUA film - Characterizations - RESULST AND DISCUSSION : Analysis of the FTIR spectra of the films - EDS analysis - Particle size analysis of emulsion - UV–Vis spectra of the films - TGA analysis of the films - DSC analysis - Contact angles and surface tension of the films - Water absorption - Physico-chemical properties of the films - Table 1 Seed emulsion composition and shell composition of emulsion sample - Table 2 Decomposition temperature of ZN-0, ZN-1, ZN-2, ZN-3, and ZN-4 films - Table 3 The contact angle and surface tension of ZN-0, ZN-2, and ZN-4 films - Table 4 Shore A hardness, transparency, and solubility characterization of the films DOI : https://doi.org/10.1007/s11998-021-00492-y En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00492-y.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36433 [article]

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Waterborne corrosion-resistant hydrophobic alkyd resin composite coatings modified with fluorinated acrylate–siloxane and submicron-sheet zinc phosphate pigment / Shenjie Zhong in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 5 (09/2021)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 18, N° 5 (09/2021) . - p. 1309-1320 Titre : Waterborne corrosion-resistant hydrophobic alkyd resin composite coatings modified with fluorinated acrylate–siloxane and submicron-sheet zinc phosphate pigment Type de document : texte imprimé Auteurs : Shenjie Zhong, Auteur ; Kang Qin, Auteur ; Yi Hou, Auteur ; Tianqi Xu, Auteur ; Ying Cai, Auteur ; Lingmin Yi, Auteur Année de publication : 2021 Article en page(s) : p. 1309-1320 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Anticorrosifs Anticorrosion Hydrophobie Phosphate de zinc Pigments organiques Polyalkydes Revêtements en phase aqueuse Index. décimale : 667.9 Revêtements et enduits Résumé : Waterborne polymeric coating for corrosion protection has been of particular interest both in academia and industrial circles for years because of its low cost and low-volatile organic compound (VOC) emissions. However, organic coating is permeable to water and oxygen resulting in the reduction of anticorrosion properties during coating application. In this study, waterborne corrosion-resistant hydrophobic-modified alkyd resin composite coatings using fluorinated acrylate–siloxane (FASAR) and submicron-sheet zinc phosphate (Zn3(PO4)2) pigment were prepared. The results of hydrophobicity, thermal, and mechanical measurements indicated that the FASAR30/5%Zn3(PO4)2 had excellent performance. More importantly, the EIS and potentiodynamic polarization tests revealed that the acquired films also exhibited high anticorrosion property for carbon steel. The corrosion current density (icorr) was 7.20 × 10−7 A cm−2, with an inhibition efficiency of 99.92%, and a corrosion rate of 8.37 × 10−3 mm per year. On the other hand, the impedance modulus (Zf = 0.01 Hz) of FASAR30/5%Zn3(PO4)2 still had 5.68 × 104 Ω cm2 after 14-day immersion in the 3.5 wt% NaCl solution. Note de contenu : - EXPERIMENTAL : Materials - Synthesis of FASAR via emulsions miniemulsion polymerization - Preparation of waterborne FASAR and FASAR/submicron-sheet Zn3(PO4)2 composite latex films - Coating process for carbon steel - CHARACTERIZATIONS : Morphology and size distribution of emulsion - Chemical structure of hybrid composite films - Wettability of the composite latex films - Mechanical property tests and thermal stability of composite latex films - Anticorrosion tests of composite latex films - RESULTS AND DISCUSSION : The morphology and sizes of FASAR emulsions - FTIR analysis - Dispersion of Zn3(PO4)2 in the composite latex films - Hydrophobicity of composite latex films - Mechanical and thermal properties of composite latex films - The corrosion properties of composite latex films - Table 1 : Recipes and properties of the FASAR emulsions - Table 2 : Contact angle values and surface energies of the thin films of composite latexes - Table 3 : The mechanical properties of composite latex films - Table 4 : TGA data of the composite latex films - Table 5 : Electrochemical parameters obtained from PDP studies for FASAR0, FASAR30 and FASAR30/submicron-sheet Zn3(PO4)2 coated CS in 3.5 wt% NaCl at room temperature - Table 6 : Electrochemical impedance spectroscopy data for uncoated FASAR0, FASAR30 and FASAR30/submicron-sheet Zn3(PO4)2-coated CS in 3.5 wt% NaCl at room temperature DOI : https://doi.org/10.1007/s11998-021-00493-y En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00493-x.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36434 [article]

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Efficiency enhancement of slow release of fertilizer using nanozeolite–chitosan/sago starch-based biopolymer composite / Rungnapa Pimsen in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 5 (09/2021)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 18, N° 5 (09/2021) . - p. 1321-1332 Titre : Efficiency enhancement of slow release of fertilizer using nanozeolite–chitosan/sago starch-based biopolymer composite Type de document : texte imprimé Auteurs : Rungnapa Pimsen, Auteur ; Paweena Porrawatkul, Auteur ; Prawit Nuengmatcha, Auteur ; Supawadee Ramasoot, Auteur ; Saksit Chanthai, Auteur Année de publication : 2021 Article en page(s) : p. 1321-1332 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Amidons Biopolymères Caractérisation Chitosane Le chitosane ou chitosan est un polyoside composé de la distribution aléatoire de D-glucosamine liée en ß-(1-4) (unité désacétylée) et de N-acétyl-D-glucosamine (unité acétylée). Il est produit par désacétylation chimique (en milieu alcalin) ou enzymatique de la chitine, le composant de l'exosquelette des arthropodes (crustacés) ou de l'endosquelette des céphalopodes (calmars...) ou encore de la paroi des champignons. Cette matière première est déminéralisée par traitement à l'acide chlorhydrique, puis déprotéinée en présence de soude ou de potasse et enfin décolorée grâce à un agent oxydant. Le degré d'acétylation (DA) est le pourcentage d'unités acétylées par rapport au nombre d'unités totales, il peut être déterminé par spectroscopie infrarouge à transformée de Fourier (IR-TF) ou par un titrage par une base forte. La frontière entre chitosane et chitine correspond à un DA de 50 % : en deçà le composé est nommé chitosane, au-delà, chitine. Le chitosane est soluble en milieu acide contrairement à la chitine qui est insoluble. Il est important de faire la distinction entre le degré d'acétylation (DA) et le degré de déacétylation (DD). L'un étant l'inverse de l'autre c'est-à-dire que du chitosane ayant un DD de 85 %, possède 15 % de groupements acétyles et 85 % de groupements amines sur ses chaînes. Le chitosane est biodégradable et biocompatible (notamment hémocompatible). Il est également bactériostatique et fongistatique. Le chitosane est également utilisé pour le traitement des eaux usées par filtration ainsi que dans divers domaines comme la cosmétique, la diététique et la médecine. Engrais organiques Matériaux hybrides Nanoparticules Zéolites Index. décimale : 667.9 Revêtements et enduits Résumé : This study developed the slow-release fertilizers using nanozeolite (NZ) composite–chitosan (CS)/sago starch (ST)-based biopolymer. The biopolymer nanocomposite was prepared by ionotropic gelation process using sodium tripolyphosphate as a crosslinking agent. The NZ was synthesized by the co-precipitation method and annealing at 650°C and characterized by scanning electron microscope, energy-dispersive X-ray spectrometry, X-ray diffractometry, and transmission electron microscope. The average particle size of NZ is 12.80 nm. The biopolymer nanocomposite was a considerable rise in the swelling ratio when molecular weight of CS and crosslinking times increased. The NZ–CS/ST nanocomposite showed the percentage amount release of phosphorus and urea at the 14th day to be 64.00 and 41.93%, respectively. The obtained fertilizer was applied to grow Philodendron sp., resulting in better growth indicators than the control and urea. Consequently, the prepared nanocomposite maintains the water level and can further be used as slow-release fertilizers in agriculture. Note de contenu : - MATERIALS AND METHODS : Materials - Synthesis of nano-zeolite (NZ) - Preparation of NZ–CS/ST nanocomposite - Characterization of the NZ and NZ–CS/ST nanocomposite - Swelling ratio (SR) analysis of the NZ–CS/ST nanocomposite - Adsorption studies of NZ–CS/ST nanocomposite - Application of NZ–CS/ST/urea fertilizer on the growth of Philodendron sp. - RESULTS AND DISCUSSION : Characterization of NZ and NZ–CS/ST nanocomposite - Effect of different MWs of CS on swelling ratio of NZ–CS/ST nanocomposite - Effect of crosslinking times on swelling ratio of the NZ–CS/ST nanocomposite - Optimization of fertilizers adsorption on the NZ–CS/ST nanocomposite - Effect of pH value on adsorption - Effect of the initial fertilizer concentration - Fertilizer release behaviors of the NZ–CS/ST nanocomposite - Effect of NZ–CS/ST/urea slow-release fertilizer on the growth of Philodendron sp. - Table 1 : Effect of fertilization types on plant growth and development of Philodendron sp. after seven weeks of acclimation - Table 2 : Comparison of chlorophyll a, chlorophyll b, and total chlorophyll at 663 and 645 nm DOI : https://doi.org/10.1007/s11998-021-00495-9 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00495-9.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36435 [article]

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A novel marine antifouling coating based on a self-polishing zinc-polyurethane copolymer / Zhengwei Dai in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 5 (09/2021)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 18, N° 5 (09/2021) . - p. 1333-1343 Titre : A novel marine antifouling coating based on a self-polishing zinc-polyurethane copolymer Type de document : texte imprimé Auteurs : Zhengwei Dai, Auteur ; Miao Cao, Auteur ; Li Shuqing, Auteur ; Jinghua Yao, Auteur ; Bo Wu, Auteur ; Yaping Wang, Auteur ; Huajin Wang, Auteur ; Jun Dong, Auteur ; Jie Yi, Auteur Année de publication : 2021 Article en page(s) : p. 1333-1343 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation Composés organiques -- Synthèse Couches minces -- Propriétés mécaniques Marines (peinture) Polyuréthanes Propionique, Acide Revêtements antisalissures:Peinture antisalissures Zinc Index. décimale : 667.9 Revêtements et enduits Résumé : A series of novel zinc-polyurethane copolymers, which contained zinc cations in the form of polymeric salt and can be exchanged with the sodium ions in sea water, was prepared. As the ion exchange reaction proceeded, the zinc-polyurethane copolymers became soluble and leached out by the flow of sea water. The self-polishing rates of marine antifouling coatings formulated with the polymers proved to be easily controlled by the amount of 2,2-bis(hydroxymethyl) propionic acid. Marine field test revealed that zinc-polyurethane antifouling coatings had excellent efficiency in preventing marine biofouling for more than 12 months. These results proved that the zinc-polyurethane copolymers were a good candidate for the preparation of long-efficiency and controllable marine antifouling coatings. Note de contenu : - MATERIALS AND METHODS : Materials - Synthesis of zinc-polyurethane - Characterization of the zinc-polyurethane films - Characterization of zinc-polyurethane antifouling coatings - RESULTS AND DISCUSSION : Properties of the zinc-polyurethane films - Water contact angle on the surfaces of zinc-polyurethane films - Mechanical properties of zinc-polyurethane films - Water absorption rates of zinc-polyurethane films - Self-polishing properties of zinc-polyurethane films - Properties of the zinc-polyurethane antifouling coatings - Self-polishing rate of the thickness of zinc-polyurethane antifouling coatings - The DCOIT release rates of zinc-polyurethane antifouling coatings - Surface analysis of zinc-polyurethane films and coatings - Assessment of antifouling performance - Table 1 The recipes of zinc-polyurethane antifouling coatings - Table 2 The synthesis of ZnX-PU - Table 3 The acid number of DMPAX-PU - Table 4 The acid number of ZnX-PU - Table 5 The mechanical properties of zinc-polyurethane films - Table 6 The typical images of zinc-polyurethane films - Table 7 The typical images of zinc-polyurethane coatings DOI : https://doi.org/10.1007/s11998-021-00496-8 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00496-8.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36436 [article]

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Factors influencing the emulsion polymerization of clay-platelet-assisted styrene–acrylic copolymer latexes / Chandrashekara R. Haramagatti in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 5 (09/2021)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 18, N° 5 (09/2021) . - p. 1345-1352 Titre : Factors influencing the emulsion polymerization of clay-platelet-assisted styrene–acrylic copolymer latexes Type de document : texte imprimé Auteurs : Chandrashekara R. Haramagatti, Auteur ; Amol T. Naikwadi, Auteur Année de publication : 2021 Article en page(s) : p. 1345-1352 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Argile Caractérisation Copolymère styrène acrylique Emulsions Emulsions -- Stabilité Emulsions pickering Polymérisation en émulsion Revêtements organiques Index. décimale : 667.9 Revêtements et enduits Résumé : Controlling the particle size of solid-particle-stabilized emulsion polymers is a challenge for coating applications where high-solid-content emulsion polymers are required. Clay-particle-stabilized styrene–acrylic copolymer emulsion was prepared by a seeded semibatch emulsion polymerization process. The effect of the concentrations of clay, peptizing agent, and methacrylic acid on the processing, final particle size, and coagulum of the emulsion polymer was studied. Dynamic light scattering (DLS), dynamic mechanical analysis, differential scanning calorimetry, and field-emission-gun scanning electron microscopy techniques were employed to characterize the emulsion polymers. The kinetics of polymerization were monitored based on the percentage solid conversion, and particle size (DLS) analysis suggested a homogeneous coagulative mechanism. The zeta potential of the polymer particles indicated good stability of the emulsion. A stable, coagulum-free, low particle size (~ 300 nm) emulsion was prepared using clay platelets, and the polymer film exhibited improved thermal and mechanical properties that will make this type of emulsion polymer of great use for coating applications. Note de contenu : - Polymerization Process - Characterization : Particle size and zeta potential - Nonvolatile material (NVM) - Electrolytic stability - Freeze–thaw stability - Viscosity - Field-emission-gun scanning electron microscopy (FEGSEM) - Dynamic mechanical analysis (DMA) - Differential scanning calorimetry (DSC) - Table 1 : Effect of KTPP content on the amount of coagulum and final particle size of the emulsions - Table 2 : The effect of the clay particle concentration on the coagulum and final particle size of the emulsion polymer - Table 3 : Effect of amount of seed on final particle size and coagulum with constant amount of Laponite and KTPP. The standard deviation for particle size is ~ 31% - Table 4 : Summary of some properties of surfactant- and Laponite RD-stabilized latex particles. F–T, freeze–thaw stability test DOI : https://doi.org/10.1007/s11998-021-00498-6 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00498-6.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36437 [article]

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Synthesis and properties of phosphorus-containing cardanol-based acrylates for flame-retardant UV/EB-cured coatings in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 5 (09/2021)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 18, N° 5 (09/2021) . - p. 1353-1364 Titre : Synthesis and properties of phosphorus-containing cardanol-based acrylates for flame-retardant UV/EB-cured coatings Type de document : texte imprimé Année de publication : 2021 Article en page(s) : p. 1353-1364 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse mécanique dynamique Caractérisation Cardanol Ignifugeants Composé chimique utilisé pour réduire l'inflammabilité. Il peut être incorporé au produit durant sa fabrication ou appliqué ultérieurement à sa surface. Oligomères Polymères -- Synthèse Revêtements -- Propriétés thermiques Revêtements organiques Stabilité thermique Index. décimale : 667.9 Revêtements et enduits Résumé : In this article, two kinds of phosphorus-containing cardanol-based acrylates were designed and synthesized. Firstly, a pre-polymer (PT-HCE) with three arms was synthesized using hydroxyethyl cardanol ether (HCE) and phosphorus oxychloride (POCl3) as raw materials. Then, the PT-HCE was acrylated to synthesize phosphate tris-hydroxyethyl cardanol epoxy acrylate resin (AEPT-HCE) and phosphate tris-hydroxyethyl cardanol photosensitive resin (APT-HCE). The structures of PT-HCE, AEPT-HCE and APT-HCE were characterized and the results showed that the photosensitive resins were successfully synthesized. In addition, AEPT-HCE and APT-HCE were used to prepare the flame-retardant UV/EB curing coatings. The properties of the coatings were tested, and the results revealed that different structures have a certain effect on Tg and tensile properties of the coatings. The cured films demonstrated excellent flame-retardant properties, showing flammability rating of V-0 in UL-94 test. Note de contenu : - EXPERIMENTAL : Materials - Synthesis of phosphorus-containing cardanol-based oligomer - Synthesis of phosphate tris-hydroxyethyl cardanol epoxy acrylate resin - Synthesis of phosphate tris-hydroxyethyl cardanol acrylate resin - Preparation of UV/EB-cured coatings - Characterization - RESULTS AND DISCUSSION : Structure characterization of cardanol-based resin - Double bond conversion ratio of coatings - Analysis of curing and conversion rate - Thermal stability of the coatings - Dynamic thermomechanical analysis of UV/EB-cured films - Properties of the UV/EB-cured coatings - Stress–strain curves of cured films - Flame retardancy of the cured films - Table 1 Thermal properties of UV/EB-cured coatings - Table 2 The properties of UV/EB-cured coatings - Table 3 Refer to American society for testing and materials standard ASTM D3801-10 DOI : https://doi.org/10.1007/s11998-021-00500-1 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00500-1.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36438 [article]

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Self-healing and corrosion performance of polyurethane coating containing polyurethane microcapsules / Hanieh Fathi Fathabadi in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 5 (09/2021)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 18, N° 5 (09/2021) . - p. 1365-1378 Titre : Self-healing and corrosion performance of polyurethane coating containing polyurethane microcapsules Type de document : texte imprimé Auteurs : Hanieh Fathi Fathabadi, Auteur ; Mehdi Javidi, Auteur Année de publication : 2021 Article en page(s) : p. 1365-1378 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Anticorrosion Caractérisation Encapsulation Essais d'adhésion Microcapsules Polymérisation interfaciale Polyuréthanes Revêtement autoréparant Revêtements organiques Spectroscopie d'impédance électrochimique Index. décimale : 667.9 Revêtements et enduits Résumé : In this study, the self-healing behavior of the polyurethane coating containing polyurethane microcapsules was investigated. Microcapsules, with the average size of 99 µm and shell thickness of 11 µm, were successfully synthesized via the interfacial polymerization technique and were incorporated into the polyurethane coating matrix. The electrochemical impedance spectroscopy and scanning electron microscope were employed to investigate the healing performance and corrosion behavior of the coatings on the carbon steel substrate. The recorded results revealed that artificial scratches were successfully healed and the coating containing 20 wt% microcapsules exhibited the best healing performance (85% healing efficiency) among all the prepared coatings. The self-healing ability of the coatings was verified via scanning electron microscope. After 24 h, the healing efficiency attained a reasonable value of 68% during exposure to test solution. It was found that corrosion resistance and coating adhesion were significantly improved by incorporating the microcapsules into the coating. Note de contenu : - EXPERIMENTAL : Materials - Preparation of microcapsules - SEM investigation - Coatings application - Evaluation of self-healing behavior of the coatings and corrosion performance - Adhesion test - RESULTS AND DISCUSSION : Characterization of the synthesized microcapsules - Self-healing performance of the coatings - The effect of microcapsule concentration on healing process - Time dependency of the healing process - Corrosion performance of the investigated coating - Adhesion test - Table 1 : Prepared and coded samples - Table 2 : The resulted electrochemical data after curve fitting the impedance results for carbon steel samples coated with polyurethane resin containing different concentrations of polyurethane microcapsules in 3.5% NaCl electrolyte - Table 3 : The resulted electrochemical data after curve fitting the impedance results for the carbon steel samples coated with polyurethane resin containing 20 wt% polyurethane microcapsules and the neat coating without any scratches in 3.5% NaCl electrolyte - Table 4 The resulted electrochemical data after curve fitting the impedance data for the carbon steel coated with polyurethane resin containing 20 wt% polyurethane microcapsules in 3.5% NaCl electrolyte at different time intervals - Table 5 The extracted electrochemical data from EIS measurements to evaluate the corrosion performance of the carbon steel coated with polyurethane resin containing 20 wt% polyurethane microcapsules in 3.5% NaCl electrolyte at different time intervals DOI : https://doi.org/10.1007/s11998-021-00501-0 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00501-0.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36439 [article]

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Influence of curcumin-modified graphene oxide on antibacterial properties of polyurethane coating / Nguyen Thuy Duong in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 5 (09/2021)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 18, N° 5 (09/2021) . - p. 1379-1387 Titre : Influence of curcumin-modified graphene oxide on antibacterial properties of polyurethane coating Type de document : texte imprimé Auteurs : Nguyen Thuy Duong, Auteur ; Van Cuong Bui, Auteur ; Bo An Tran, Auteur ; Thanh Thao Phan, Auteur ; Ke Oanh Vu, Auteur ; Anh Son Nguyen, Auteur ; Anh Truc Trinh, Auteur ; Thi Chinh Tang, Auteur ; Thi Xuan Hang To, Auteur Année de publication : 2021 Article en page(s) : p. 1379-1387 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Antibactériens Caractérisation Curcumine Essais (technologie) Oxyde de graphène Polyuréthanes Revêtements -- Propriétés physiques Revêtements organiques Index. décimale : 667.9 Revêtements et enduits Résumé : This study aims to prepare antibacterial coatings based on polyurethane and curcumin-modified graphene oxide. Curcumin-modified graphene oxide (GO-CU) as an antibacterial agent was prepared using the adsorption method. GO-CU was incorporated in polyurethane (PU) coatings at concentrations of 0.1 and 0.5 wt%. Synthesized GO-CU was characterized by Fourier transform infrared spectroscopy, UV–Vis spectroscopy, transmission scanning electron microscopy, and zeta potential measurement. Curcumin content in GO-CU was determined by thermogravimetric analysis. Antibacterial properties of GO-CU powder and PU coatings containing GO-CU were investigated by counting the colony-forming unit (CFU) of Escherichia coli (E. coli) strain. The results showed that curcumin was attached on GO-CU surface and curcumin content in GO-CU was about 32.9%. GO-CU provided a higher antibacterial effect against E. coli than GO. The antibacterial efficiency of PU coatings containing 0.1 wt% GO-CU was 85.8%; however, the increase in GO-CU concentration did not significantly increase the antibacterial efficiency of PU coating. Note de contenu : - EXPERIMENTAL : Materials - Modification of graphene oxide by curcumin - Preparation of polyurethane coatings containing GO-CU - Analytical characterization - Antibacterial test of GO-CU - Antibacterial test of PU coatings containing GO-CU - RESULTS AND DISCUSSION : Characterization of Go-CU - Morphology of PU coating containing GO-CU - Physical properties of PU coating - Antibacterial ability of GO-CU and PU coating loading GO-CU - Table 1 : Physical properties of coatings DOI : https://doi.org/10.1007/s11998-021-00502-z En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00502-z.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36440 [article]

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Reversible thermochromic performance of cresol red-boric acid system loaded on fibrous mesoporous silica microspheres coating material / Tinting Yu in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 5 (09/2021)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 18, N° 5 (09/2021) . - p. 1389-1399 Titre : Reversible thermochromic performance of cresol red-boric acid system loaded on fibrous mesoporous silica microspheres coating material Type de document : texte imprimé Auteurs : Tinting Yu, Auteur ; Liang Cheng, Auteur ; Haocheng Cai, Auteur ; Geng Li, Auteur ; Xu Wang, Auteur ; Linghan Kong, Auteur ; Jianbo Zhan, Auteur ; Hao Wang, Auteur ; Ying Zhang, Auteur ; Zhenhua Yu, Auteur ; Han Zheng, Auteur Année de publication : 2021 Article en page(s) : p. 1389-1399 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Borique, Acide Caractérisation Colorants Matériaux fibreux Matériaux mésoporeux Microsphères Morphologie (matériaux) Revêtements Rouge de Crésol Silice La silice est la forme naturelle du dioxyde de silicium (SiO2) qui entre dans la composition de nombreux minéraux. La silice existe à l'état libre sous différentes formes cristallines ou amorphes et à l'état combiné dans les silicates, les groupes SiO2 étant alors liés à d'autres atomes (Al : Aluminium, Fe : Fer, Mg : Magnésium, Ca : Calcium, Na : Sodium, K : Potassium...). Les silicates sont les constituants principaux du manteau et de l'écorce terrestre. La silice libre est également très abondante dans la nature, sous forme de quartz, de calcédoine et de terre de diatomée. La silice représente 60,6 % de la masse de la croûte terrestre continentale. Thermochromie Index. décimale : 667.2 Colorants et pigments Résumé : In this study, the fibrous mesoporous silica F-SiO2 was functionalized with 3-aminopropyltriethoxysilane (APTES). The reversible thermochromic composites of fibrous mesoporous silica (F-SiO2) and amino group-modified fibrous mesoporous silica (F-SiO2-NH2) microspheres loaded with cresol red-boric acid (CR-BA) were termed as S2 (F-SiO2/CR-BA) and SN2 (F-SiO2-NH2/CR-BA), respectively. The materials obtained were characterized by infrared spectroscopy, transmission electron microscopy, scanning and transmission electron microscopy, differential scanning calorimetry, and thermogravimetric analysis. The fibrous morphology of this rigid carrier was maintained after loading with the CR-BA composite system. Owing to the APTES modification, the F-SiO2-NH2/CR-BA composites underwent more severe color changes than the F-SiO2/CR-BA composites. In addition, the F-SiO2-NH2/CR-BA composites can recover the original color in only 210 s, illustrating excellent reversibility. Note de contenu : - MATERIALS AND METHODS : Materials - Preparation of fibrous mesoporous silica microspheres (F-SiO2) - Amino group-modified fibrous mesoporous silica microspheres (F-SiO2-NH2) - Preparation of F-SiO2 and F-SiO2-NH2 with cresol red-boric acid - Preparation of F-SiO2 and F-SiO2-NH2 with cresol red - Thermochromic properties of synthesized composite microspheres - Characterization - RESULTS AND DISCUSSION : Characterization of the synthesized mesoporous silica microspheres - The effect of the content of silica microspheres on thermochromic performance of synthesized composite microsphere - Color recovery performance of synthesized composite microspheres - The effect of BA on thermochromic performance of synthesized composite microspheres - Table 1 : The recipes of F-SiO2/CR-BA and F-SiO2-NH2/CR-BA composite microspheres series DOI : https://doi.org/10.1007/s11998-021-00504-x En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00504-x.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36441 [article]

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Evaluation of linear and nonlinear rheology of microfibrillated cellulose / Sweta Sarangi in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 5 (09/2021)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 18, N° 5 (09/2021) . - p. 1401-1411 Titre : Evaluation of linear and nonlinear rheology of microfibrillated cellulose Type de document : texte imprimé Auteurs : Sweta Sarangi, Auteur ; Suresh Kumar Yatirajula, Auteur ; Vinod Kumar Saxena, Auteur Année de publication : 2021 Article en page(s) : p. 1401-1411 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation Cisaillement (mécanique) Fibres cellulosiques Loi de puissance La loi de puissance est une relation mathématique entre deux quantités. Si une quantité est la fréquence d'un évènement et l'autre est la taille d'un évènement, alors la relation est une distribution de la loi de puissance si les fréquences diminuent très lentement lorsque la taille de l'évènement augmente. En science, une loi de puissance est une relation entre deux quantités x et y qui peut s'écrire de la façon suivante : y = a x k {\displaystyle y=ax^{k}} y=ax^{k} où a est une constante dite constante de proportionnalité et k est une autre constante, dite exposant, puissance, indice ou encore degré de la loi. On observe des lois de puissance dans beaucoup de domaines scientifiques (physique, biologie, psychologie, sociologie, économie, linguistique). Elles permettent en effet de décrire tous les phénomènes qui présentent une invariance d'échelle. Rhéologie Tension superficielle Viscoélasticité Index. décimale : 667.9 Revêtements et enduits Résumé : Microfibrillated cellulose (MFC) is a noble class of material that has drawn considerable attention due to its numerous properties such as mechanical robustness, high aspect ratio, lower coefficient of thermal expansion, water retention ability, barrier properties to oxygen, compatibility with biomaterials, biodegradability, large surface area and interesting rheology. This present work deals with the rheology of MFC suspension in water. The effect of temperature on the concentration of the suspension of MFC was studied. Three regimes of MFC were observed for the shear rate lying in the range of 0.01–1000 s−1, supported by a buildup of a network of hydroxyl groups present on the surface, resulting in shear thinning, shear thickening, and shear thinning regions, respectively. An increase in the concentration of MFC, increased viscosity, and the dominance of storage modulus were observed. A high value of storage modulus indicates a higher degree of crosslinking of fibrils. The experimental data were well fitted by using the Ostwald-de Waele power law model. The results suggested that an increase in the temperature did not have any significant effect on the MFC rheology in the temperature range of 25–60°C. The Gaussian process regression model was used to determine the performance parameters. Dynamic oscillatory measurements were performed to validate the viscoelastic behavior. Note de contenu : - EXPERIMENTAL : Materials - FTIR analysis - Morphology - Interfacial tension measurement - Rheological measurement - Power-law model - Gaussian process regression model RESULTS AND DISCUSSION : Structural and physical characterization - Interfacial tension measurement - Rheological studies - Table 1 : Main spectral peaks with band assignments of the functional groups for MFC - Table 2 : Effect of temperature on three different regions in terms of shear rate (s−1) range and Ostwald-de Waele power law model parameters for 2% aqueous MFC suspensions - Table 3 : The GPR fitting parameters for the aqueous suspension of MFC at different temperatures DOI : https://doi.org/10.1007/s11998-021-00505-w En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00505-w.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36442 [article]

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Development of an accelerated test method for dirt pick-up resistance / Daniel C. Kraiter in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 5 (09/2021)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 18, N° 5 (09/2021) . - p. 1413-1430 Titre : Development of an accelerated test method for dirt pick-up resistance Type de document : texte imprimé Auteurs : Daniel C. Kraiter, Auteur ; Scott C. Brown, Auteur ; Michael P. Diebold, Auteur ; Peter Jernakoff, Auteur ; Alan F. Vera-Balbuena, Auteur Année de publication : 2021 Article en page(s) : p. 1413-1430 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Adhésion thermique Caractérisation Concentration pigmentaire volumique Essais accélérés (technologie) Liants Résistance à la salissure Revêtements en bâtiment:Peinture en bâtiment Transition vitreuse Index. décimale : 667.9 Revêtements et enduits Résumé : Dirt pick-up is a long-standing issue for exterior architectural coatings. Dirt pick-up resistance (DPR) is highly sought by end users, and significant resources have been committed by paint manufacturers to improve it. The task is complicated by the multitude of regional and local factors such as seasonal weather, intensity of economic activity, or atmospheric particle burden. Typically, paint manufacturers try to control DPR via careful selection of additives and formula optimization. Testing the new formulas in real time is long and, therefore, there is a clear need for a faster and more reliable test that takes into account the key elements of the dirt pick-up mechanism: particle transport, adhesion, and release to/from the surface. Our team has developed an accelerated test that focuses on thermally driven adhesion and takes a fraction of the time necessary for outdoor exposure testing. The test correlates well with early outdoor exposure results when formulation parameters are controlled and when there are moderate-to-large performance differences among paint formulas. The test was used to improve the accelerated DPR of a paint formula, which subsequently was verified against real-time outdoor exposure in three geographic regions with different climates and airborne particulate pollution levels. Note de contenu : - Table 1 : Outdoor exposure sites and conditions - Table 2 : Composition and characterization of polymeric binders - Table 3 : Composition of paints having binders with different Tg values - Table 4 : Coefficients of correlation between outdoor exposure (several months) and accelerated test method (using twenty-four dusting events) for the binder Tg series - Table 5 : Composition of paints having different PVCs - Table 6 : Coefficients of correlation between outdoor exposure (several months) and accelerated test method (using twenty-four dusting events) for the PVC series - Table 7 : Commercial paints (and selected properties) used for the comparison of outdoor exposure and accelerated test - Table 8 : Impact of crosslinking on film properties - Table 9 : Paint variables evaluated in the experimental design DOI : https://doi.org/10.1007/s11998-021-00506-9 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00506-9.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36443 [article]

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Different machined wood slices for separation of both oil/water mixtures and emulsions / Yanbiao Zhou in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 5 (09/2021)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 18, N° 5 (09/2021) . - p. 1431-1443 Titre : Different machined wood slices for separation of both oil/water mixtures and emulsions Type de document : texte imprimé Auteurs : Yanbiao Zhou, Auteur ; Kaige Qu, Auteur ; Xiaoqiang Luo, Auteur ; Lihui Zhang, Auteur Année de publication : 2021 Article en page(s) : p. 1431-1443 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Bois Caractérisation Emulsions Hydrophobie Mélange Oléophilie Séparation huile/eau Index. décimale : 667.9 Revêtements et enduits Résumé : Tremendous efforts have been exerted to develop effective and ecofriendly materials for separation of oil/water mixtures and emulsions. However, porous materials with superwettability for oil/water separation are usually fabricated from nonrenewable precursors, which contradicts with the concept of green development. Inspired by the cellular porosity and hierarchical organization of wood, biodegradable cut and sawed wood slices with different pore sizes were separately machined by a razor blade and a fine-toothed saw. The cut and sawed slices separately possessed rough single- and double-layer structures. After silylation with MTCS, both machined slices repelled water entirely but allowed the complete permeation of oils. The fragment-free cut slice with relatively large pore size was able to separate immiscible oil/water mixtures, while the fragment-covered sawed slice with relatively small pore size could separate water-in-oil emulsions. Compared with other wood slice by sawing, the section structure and superoleophilic property made the slices have a high oil flux for a series of mixtures and emulsions, which reached 72 kL m-2 h-1 and 464 L m-2 h-1, respectively. The flux was high even after 10 cycles, exhibiting favorable recyclable stability. Note de contenu : - Materials - Machining of different wood slices - Fabrication of superhydrophobic slices - Separation of oil/water mixtures - Separation of water-in-oil emulsions - Characterization DOI : https://doi.org/10.1007/s11998-021-00511-y En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00511-y.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36444 [article]

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