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Overview on progress in polysaccharides and aliphatic polyesters as coating of water-soluble fertilizers / Taha El Assimi in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 4 (07/2022)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 4 (07/2022) . - p. 989-1007 Titre : Overview on progress in polysaccharides and aliphatic polyesters as coating of water-soluble fertilizers Type de document : texte imprimé Auteurs : Taha El Assimi, Auteur ; Redouane Beniazza, Auteur ; Mustapha Raihane, Auteur ; Hicham Ben Youcef, Auteur ; Abdellatif El Meziane, Auteur ; Hans Kricheldorf, Auteur ; Mohammed Lahcini, Auteur Année de publication : 2022 Article en page(s) : p. 989-1007 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Biopolymères Engrais organiques Enrobage (technologie) Polysaccharides Les polysaccharides (parfois appelés glycanes, polyosides, polyholosides ou glucides complexes) sont des polymères constitués de plusieurs oses liés entre eux par des liaisons osidiques. Les polyosides les plus répandus du règne végétal sont la cellulose et l’amidon, tous deux polymères du glucose. De nombreux exopolysaccharides (métabolites excrétés par des microbes, champignons, vers (mucus) du ver de terre) jouent un rôle majeur - à échelle moléculaire - dans la formation, qualité et conservation des sols, de l'humus, des agrégats formant les sols et de divers composés "argile-exopolysaccharide" et composites "organo-minéraux"(ex : xanthane, dextrane, le rhamsane, succinoglycanes...). De nombreux polyosides sont utilisés comme des additifs alimentaires sous forme de fibre (inuline) ou de gomme naturelle. Ce sont des polymères formés d'un certain nombre d'oses (ou monosaccharides) ayant pour formule générale : -[Cx(H2O)y)]n- (où y est généralement x - 1). On distingue deux catégories de polysaccharides : Les homopolysaccharides (ou homoglycanes) constitués du même monosaccharide : fructanes, glucanes, galactanes, mannanes ; les hétéropolysaccharides (ou hétéroglycanes) formés de différents monosaccharides : hémicelluloses. Les constituants participant à la construction des polysaccharides peuvent être très divers : hexoses, pentoses, anhydrohexoses, éthers d'oses et esters sulfuriques. Selon l'architecture de leur chaîne, les polysaccharides peuvent être : linéaires : cellulose ; ramifiés : gomme arabique, amylopectine, dextrane, hémicellulose et mixtes : amidon. Système de libération contrôlée (technologie) Index. décimale : 667.9 Revêtements et enduits Résumé : Nitrogen, phosphorus, and potassium are the major nutrients solicited in the fertilization process, and their supply is highly useful to improve agricultural productivity. The conventional fertilizers suffer from low efficacy due to the fast release of nutrients. For that, the coating of granular fertilizer is considered as the best way to enhance their efficiency. Nowadays, biodegradable polymers are replacing synthetic polymers and avoiding the accumulation of nondegradable plastic residues in arable land. Since the coating of fertilizers by sulfur was criticized, many research studies investigated the use of polysaccharide such as cellulose, chitosan, carrageenan, lignin, and starch or aliphatic polyesters such as polylactide and polycaprolactone as coating matrix for granular fertilizer coating to delay or control the dissolution rate of nutrients. This review starts by apprising the readers about the environmental impact of conventional fertilizers (uncoated) and then an overview on the use of all those biopolymers and their combination for the coating agent mineral fertilizer. Furthermore, the present contribution provides an outline on different coating processes solicited in the field and the slow-release fertilizers criteria. Note de contenu : - THE CONVENTIONAL FERTILIZERS ISSUE - THE FERTILIZER NUTRIENTS SLOW-RELEASE CRITERIA - COATING PROCESS : Rotary drum - Fluidized bed - Dip-coating process - MECHANISM OF SLOW- AND CONTROLLED-RELEASE FERTILIZER (CSRF) - BIODEGRADABLE POLYMERS USED AS FERTILIZER COATING AGENTS : Polysaccharides - Aliphatic polyesters as coating agent - BIODEGRADABILITY OF THE COATING MATERIAL - CONCLUSIONS AND PERSPECTIVES - Table 1 : Polysaccharides as coating material of granular fertilizers - Table 2 : Aliphatic polyesters tested as coating material of granular fertilizers in the 21 st century DOI : https://doi.org/10.1007/s11998-022-00613-1 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00613-1.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38031 [article]

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Layered double hydroxides (LDHs) for coating applications / Ameya Jagtap in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 4 (07/2022)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 4 (07/2022) . - p. 1009-1032 Titre : Layered double hydroxides (LDHs) for coating applications Type de document : texte imprimé Auteurs : Ameya Jagtap, Auteur ; Pareena G. Wagle, Auteur ; Ekta Jagtiani, Auteur ; Aarti Purushottam More, Auteur Année de publication : 2022 Article en page(s) : p. 1009-1032 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Anticorrosifs Anticorrosion Charges (matériaux) Hydroxydes doubles lamellaires Ignifugeants Composé chimique utilisé pour réduire l'inflammabilité. Il peut être incorporé au produit durant sa fabrication ou appliqué ultérieurement à sa surface. Nanoparticules Revêtements organiques Revêtements protecteurs Index. décimale : 667.9 Revêtements et enduits Résumé : Layered double hydroxides (LDHs) are an emerging technology that is used as a filler in coatings due to its structural and compositional flexibility. LDHs are layered compounds composed of positive metal hydroxides and negatively charged interlayer anions. We have discussed the structures and characteristics of LDHs in this review study, as well as many processes, such as the barrier mechanism, self-healing corrosion inhibitor method, and superhydrophobic mechanism, that demonstrate how LDHs operate in anticorrosion coatings. Additionally, how the use of LDH imparts flame-retardant qualities to the coatings is covered here, along with their respective processes. LDH coatings are suitable for packaging, biomedical, water treatment, and conductive applications alone or in combination with other materials. Note de contenu : - Literature survey on LDHs : Structure - Properties - Synthesis methods for LDHs - Coating preparation method - LDHs for anticorrosive application - LDHs as flame retardant - Other coatings - Outlook and limitations - Conclusions and future prospects - Table 1 : Different composition of LDHs - Table 2 : The LDHs and their applications DOI : https://doi.org/10.1007/s11998-022-00624-y En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00624-y.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38032 [article]

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A char stratification approach to characterization and quantitative thermal insulation performance of hydrocarbon intumescent coatings / Ying Zeng in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 4 (07/2022)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 4 (07/2022) . - p. 1033-1043 Titre : A char stratification approach to characterization and quantitative thermal insulation performance of hydrocarbon intumescent coatings Type de document : texte imprimé Auteurs : Ying Zeng, Auteur ; Claus Erik Weinell, Auteur ; Kim Dam-Johansen, Auteur ; Louise Ring, Auteur ; Søren Kiil, Auteur Année de publication : 2022 Article en page(s) : p. 1033-1043 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Borate de zinc Caractérisation Carbonisation Hydrocarbures Intumescence (chimie) Métaux -- Revêtements protecteurs Polyphosphate d'ammonium Pyrolyse La pyrolyse est la décomposition ou thermolyse d'un composé organique par la chaleur pour obtenir d'autres produits (gaz et matière) qu'il ne contenait pas. L'opération est réalisée en l'absence d'oxygène ou en atmosphère pauvre en oxygène pour éviter l'oxydation et la combustion (L’opération ne produit donc pas de flamme). Il s'agit du premier stade de transformation thermique après la déshydratation. Elle permet généralement d'obtenir un solide carboné, une huile et un gaz. Elle débute à un niveau de température relativement bas (à partir de 200 °C) et se poursuit jusqu'à 1 000 °C environ. Selon la température, la proportion des trois composés résultants est différente. Résistance à la flamme Revêtements multicouches Rhéologie Viscosité Index. décimale : 667.9 Revêtements et enduits Résumé : To protect structural steel in the event of a hydrocarbon fire, epoxy-based intumescent coatings, which expand to form a multicellular char layer, are increasingly used. Consequently, to improve formulations and understand the performance of such coatings, it is of great industrial and scientific interest to establish relationships between the char properties and the critical heating times of coated steel plates. In this work, a so-called Stratification Parameter (SP) that combines the relative expansions and insulation efficiencies of individual char layers (termed the sponge-like, the macroporous, and the compact phase, respectively), is introduced to characterize the properties of the multilayered intumescent coating char. An approximate linear relationship was revealed between the SP of the char and the fire-resistance performance (i.e., critical times to 400 and 550°C) of the intumescent coating. Furthermore, owing to the mapped-out exponential relationship between the dynamic viscosity minimum and the char appearance, it was discovered that the SP of the char can be effectively used to point out the required dynamic viscosity change of an intumescent coating to form a given char. Finally, results of thermogravimetric analyses suggest that constraining the coating mass loss during char degradation (to less than 28 wt% for the coatings of the present work) may prevent the formation of the less efficient sponge-like phase. The stratification methodology developed can be used to estimate expected thermal insulation properties of non-uniform hydrocarbon intumescent coating chars. Note de contenu : - EXPERIMENTAL SECTION : Coating materials and application - Fire-resistance performance - Rheological measurements of incipient intumescent chars - Thermal degradation of the intumescent coatings Digital microscope recordings of char structure - RESULTS AND DISCUSSION : Influence of the char expansion on the critical times - Stratification approach to thermal insulation of char layers - Parameters of interest for manipulating intumescent char properties - Table 1 : Composition of the series of zinc borate intumescent coatings (in wt%), APP = ammonium polyphosphate, MEL = melamine, ZB = zinc borate. The level of zinc borate remains constant at 5 wt% - Table 2 : Composition of the series of zinc borate-free intumescent coatings (in wt%), APP = ammonium polyphosphate, MEL = melamine DOI : https://doi.org/10.1007/s11998-021-00591-w En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00591-w.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38033 [article]

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Influence of chain length of organic modifiers in hydrophobization process on epoxy resin properties / G. Morgiante in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 4 (07/2022)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 4 (07/2022) . - p. 1045-1053 Titre : Influence of chain length of organic modifiers in hydrophobization process on epoxy resin properties Type de document : texte imprimé Auteurs : G. Morgiante, Auteur ; M. Pilkowski, Auteur ; J. Marczak, Auteur Année de publication : 2022 Article en page(s) : p. 1045-1053 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Adhésion Angle de contact Caractérisation Eau Energie de surface Epoxydes Glace sèche Matériaux -- Modifications chimiques Mouillabilité Mouillage (chimie des surfaces) Revêtements organiques Index. décimale : 667.9 Revêtements et enduits Résumé : Resins have been widely used in a variety of industry fields for more than a century, such as coatings, adhesives, or automotive. Their low cost and workability are extremely useful in creating more and more advanced materials due to their chemical structure (Ghaffari et al. in Surf Interfaces 17:100340, 2019). Common problem today is the wetting tendency of various materials which in the end can result in further damage in the structure because of atmospheric conditions. Nowadays, scientists are trying to find better ways to improve the properties of coatings or composites in cases like hydrophobicity or icephobicity. One of the examp les are fluorinated organic compounds with good linking properties to the substrate (Qin et al. in Mater Today Commun 22:100770, 2020). Because o f that, to im prove the properties of a basic epoxy resin, its chain has been modified with hydrophobic compounds with different chain lengths. Influence of modifiers’ molecule size on hydrophobic and ice adhesion properties of obtained epoxy resins has been tested. Chemical composition of prepared coatings was analyzed by FTIR. Moreover, their thermal stability was investigated using TG and DSC measurements. Additionally, wettability of the samples was analyzed with a goniometer. Furthermore, their ice adhesion tests were performed on a dedicated apparatus. As a result, presented work provides a critique overview and concept of promising icephobic and hydrophobic coatings in the industry. Moreover, these products have a high chance to be developed further. Note de contenu : EXPERIMENTAL METHODS AND MATERIALS : Materials - Epoxy resin coatings preparation - Characterization - Water contact angle (WCA) measurements and surface free energy (SFE) - Ice adhesion - Fourier-transform infrared (FTIR) spectroscopy - Thermogravimetry (TG) - Differential scanning calorimetry (DSC) - RESULTS AND DISCUSSION : Water contact angle (WCA) measurements and surface free energy (SFE) - Ice adhesion - Thermogravimetry (TG) - Differential scanning calorimetry (DSC) DOI : https://doi.org/10.1007/s11998-021-00583-w En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00583-w.pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38034 [article]

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Preparation and characterization of cationic waterborne polyurethanes containing a star-branched polydimethylsiloxane / Xiaoling He in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 4 (07/2022)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 4 (07/2022) . - p. 1055-1066 Titre : Preparation and characterization of cationic waterborne polyurethanes containing a star-branched polydimethylsiloxane Type de document : texte imprimé Auteurs : Xiaoling He, Auteur ; Jingwei He, Auteur ; Yangkun Sun, Auteur ; Xiaopei Zhou, Auteur ; Jingying Zhang, Auteur ; Fang Liu, Auteur Année de publication : 2022 Article en page(s) : p. 1055-1066 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation Dépôt électrolytique Polydiméthylsiloxane Le polydiméthylsiloxane —[O-Si(CH3)2]n—, ou poly(diméthylsiloxane) selon la nomenclature systématique, communément appelé PDMS ou diméthicone, est un polymère organominéral de la famille des siloxanes souvent présent dans les shampoings. On l'y ajoute pour augmenter le volume des cheveux mais il peut également aller boucher les pores du cuir chevelu et rendre les cheveux gras. C'est une des raisons pour lesquelles se laver les cheveux tous les jours est très déconseillé avec un shampooing contenant des silicones. Il existe également de l'amodiméthicone, qui est un dérivé du diméthicone. Le polydiméthylsiloxane est un additif alimentaire (E900), utilisé comme antimoussant dans les boissons (Coca-Cola BlāK). La chaîne de poly(diméthylsiloxane) forme également la structure de base des huiles et des caoutchoucs silicones. Polymères -- Propriétés mécaniques Polymères -- Synthèse Polymères cationiques Polymères en émulsion Polymères ramifiés Polyuréthanes Résistance à l'humidité:Résistance à l'eau Revêtements en phase aqueuse Revêtements organiques Index. décimale : 667.9 Revêtements et enduits Résumé : Cationic waterborne polyurethanes (CWPUs) bring in hydrophilic component to molecular chain, which inevitably deteriorates its water-resistant ability. Here, we synthesized a series of branched chain cationic waterborne polyurethanes (i.e., CWPUs-Si) that had been modified using a novel star-branched polydimethylsiloxane (SB-PDMS) to improve their water-resistant performance. The effects of SB-PDMS content on the properties of the CWPUs-Si polymers (e.g., crystallinity, emulsion stability, mechanical performance, surface element enrichment, surface topography, water resistance), together with the performance of coatings prepared by cathodic electrodeposition, were determined. The results showed that the introduction of SB-PDMS increased phase separation and surface roughness induced by hydrogen bonding while the surface energy decreased, both of which improved water resistance. The polymers showed improved rigidity due to increased content of the hard segments and enhanced physical crosslinking. Except for an increase in pencil hardness, SB-PDMS had no effect on the films prepared by cathodic electrodeposition. The results from this study may provide a strategy to improve the water-resistant properties of CWPUs. Note de contenu : - EXPERIMENTAL : Materials - Synthesis of CWPUs-Si - Preparation of CWPUs-Si cast films and CED coatings - Characterization - RESULTS AND DISCUSSION : Synthesis and characterization of CWPUs-Si - Emulsion properties of the CWPUs-Si polymers - Surface element analysis of CWPUs-Si - Surface topography of CWPUs-Si - Water resistance of CWPUs-Si - Mechanical properties of CWPUs-Si - Properties of CED coatings prepared from the CWPUs-Si polymers - Table 1 : The composition design of CWPUs-Si - Table 2 : Table 2 Emulsion properties of CWPUs-Si polymers - Table 3 : Atomic mass contents of CWPUs-Si polymers DOI : https://doi.org/10.1007/s11998-021-00584-9 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00584-9.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38035 [article]

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Effect of titania, barite, and kaolinite fillers on char layer formation in water-based intumescent fire-retardant coatings / Iben Hansen-Bruhn in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 4 (07/2022)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 4 (07/2022) . - p. 1067-1075 Titre : Effect of titania, barite, and kaolinite fillers on char layer formation in water-based intumescent fire-retardant coatings Type de document : texte imprimé Auteurs : Iben Hansen-Bruhn, Auteur ; Anne Vetter Poulsen, Auteur ; Ulrik Abildgaard, Auteur ; Jens Bomholdt Ravnsbæk, Auteur ; Mogens Hinge, Auteur Année de publication : 2022 Article en page(s) : p. 1067-1075 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Barytine La barytine (ou baryte, voir les synonymes) est une espèce minérale composée de sulfate de baryum de formule BaSO4 avec des traces de Sr, Ca et Pb. Ce minéral, d'origine hydrothermale, présente de nombreuses variétés. Sa densité et le baryum qu'il contient sont les causes principales de ses utilisations industrielles et plusieurs millions de tonnes de barytine sont extraits et produits chaque année. (Wikipedia) Char (matériaux pyrolysé) Charges (matériaux) Dioxyde de titane Ignifugeants Composé chimique utilisé pour réduire l'inflammabilité. Il peut être incorporé au produit durant sa fabrication ou appliqué ultérieurement à sa surface. Intumescence (chimie) Kaolinite Revêtements en phase aqueuse Revêtements protecteurs Index. décimale : 667.9 Revêtements et enduits Résumé : Intumescent fire-retardant coatings are widely applied as they combine designable aesthetics and fire protection without compromising substrate properties. When exposed to heat, intumescent fire-retardant coatings expand and build an insulating char. This study presents an investigation of the char by addition of kaolinite, barite, and titania as functional fillers in intumescent coatings. Expansion experiments at 400°C with custom build image analysis showed that kaolinite inhibited (0.03 mm/s, expansion factor ≈ 7), whereas barite acted synergistically on the expansion ability (0.59 mm/s, expansion factor ≈ 85). The resulting char density and the visual inspection showed that barite char was less compact, with cracks and voids. Evaluation of fire performance by single burning item tests resulted in Euroclass C for the barite system and Euroclass A2/B for the titania system. Post-heating chars demonstrated poor thermostability of barite char, and subsequent FTIR spectroscopy revealed that titania char formed the thermostable titanium pyrophosphate. Further inspection of the titania char revealed a uniform closed cell structure with mean bubble sizes of 26–56 µm. Titania coating expands rapidly (0.37 mm/s, expansion factor ≈ 60) and forms a structurally stable tumescent char with a compact and uniform porous structure exhibiting resistance to char oxidation at sustained heating. Note de contenu : - Coating preparation - Sample preparation and coating thickness - Fourier transform infrared spectroscopy - Char expansion rate - Image analysis - Char density - High temperature char degradation - Fire performance - Scanning electron microscopy - Table 1: Intumescence characteristics. Extracted parameters from image analysis and measured char density. α: Expansion rate, β: Expansion factor, ρ: Density, H: Char height, and t: Time - Table 2 : SBI results of titania, barite, and FR coatings. FIGRA: Fire growth index at 0.2 MJ and 0.4 MJ, respectively. THR: Total heat release after 600 s test time. SMOGRA: Smoke growth index. TSP: Total smoke production after 600 s test time DOI : https://doi.org/10.1007/s11998-021-00585-8 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00585-8.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38036 [article]

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Study on the ultraviolet absorbing properties of cotton fabric finished with boron and nitrogen co-doped carbon dots / Shijie Cheng in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 4 (07/2022)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 4 (07/2022) . - p. 1077-1086 Titre : Study on the ultraviolet absorbing properties of cotton fabric finished with boron and nitrogen co-doped carbon dots Type de document : texte imprimé Auteurs : Shijie Cheng, Auteur ; Chenyang Wang, Auteur ; Hongwei Zhang, Auteur ; Hantao Zou, Auteur ; Danying Zuo, Auteur Année de publication : 2022 Article en page(s) : p. 1077-1086 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Azote Bore Caractérisation Carbone Coton Le coton est une fibre végétale qui entoure les graines des cotonniers "véritables"(Gossypium sp.), un arbuste de la famille des Malvacées. Cette fibre est généralement transformée en fil qui est tissé pour fabriquer des tissus. Le coton est la plus importante des fibres naturelles produites dans le monde. Depuis le XIXe siècle, il constitue, grâce aux progrès de l'industrialisation et de l'agronomie, la première fibre textile du monde (près de la moitié de la consommation mondiale de fibres textiles). Résistance au rayonnement ultraviolet Textiles et tissus Textiles et tissus -- Lavage Index. décimale : 667.9 Revêtements et enduits Résumé : To improve the UV resistance of cotton fabrics, three different carbon dots doped with boron and nitrogen (BN-CDs) were prepared by a one-step hydrothermal synthesis method using citric acid, ammonium citrate and glucose as different carbon sources, and ethylenediamine and borax as nitrogen and boron sources, respectively. Three types of blended aqueous solutions (BN-CDs/WPU) with BN-CDs and water-based polyurethane were sprayed on the surface of cotton fabric, and then the cotton fabric was rolled and dried. The structure and optical properties of BN-CDs were characterized by Fourier transform infrared spectroscopy, transmission electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, ultraviolet-visible spectrophotometry, and fluorescence spectrophotometry. The structure and ultraviolet screening capability of cotton fabrics after finishing with BN-CD/WPU blend solution were characterized. Results showed that the prepared BN-CDs were graphite-like nanocrystals with an approximately 0.3-nm crystal plane spacing. All BN-CDs had rich hydroxyl groups and amine groups on the surface, which made the BN-CDs soluble in water. BN-CDs had a strong absorption peak in the ultraviolet region and emitted bright blue fluorescence independent of excitation wavelengths. Cotton fabrics finished with BN-CDs/WPU all showed a high ultraviolet protection factor (UPF), an excellent level of protection, and good washing durability. In particular, in cotton fabrics treated with BN-CDs prepared using citric acid as a carbon source, the UPF value was still as high as 50.1 even after washing 10 times, and the fabrics maintained good elasticity and morphological characteristics. Results thus showed that BN-CDs can be used as UV absorption agents for finishing cotton fabrics. Note de contenu : - EXPERIMENTAL SECTION : Experimental materials - Synthesis of BN-CDs - Cotton fabric treatment - UPF value test and protection level assessment - RESULTS AND DISCUSSION : Structural analysis of BN-CDs - Photoluminescence characteristics of BN-CDs - Infrared spectrum of cotton fabric samples - Surface morphology of cotton fabric samples - UV protection of cotton fabric samples - Table 1 : Element distribution table of three different carbon source carbon quantum dots - Table 2 : UV protection factor of cotton fabric samples after finishing and different washing times DOI : https://doi.org/10.1007/s11998-021-00586-7 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00586-7.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38037 [article]

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Enhanced anticorrosion property of epoxy resin membrane by nano-organic montmorillonite / Jing-Yi Liu in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 4 (07/2022)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 4 (07/2022) . - p. 1087-1100 Titre : Enhanced anticorrosion property of epoxy resin membrane by nano-organic montmorillonite Type de document : texte imprimé Auteurs : Jing-Yi Liu, Auteur ; Shi-Zhao Wu, Auteur ; Zhu Shen, Auteur ; Jing Gao, Auteur ; Xin-Quan Hu, Auteur ; Guo-Hua Li, Auteur Année de publication : 2022 Article en page(s) : p. 1087-1100 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Anticorrosion Biomatériaux Caractérisation Composites Epoxydes Membranes (technologie) Métaux -- Revêtements protecteurs Montmorillonite Revêtements organiques Revêtements protecteurs Index. décimale : 667.9 Revêtements et enduits Résumé : Montmorillonite (Mnt) and organic polymer composite membrane are widely used to enhance the corrosive resistance of metal materials due to their unique properties. Herein, a uniform anticorrosion membrane coated on aluminum plate was fabricated with organic-modified nano-Mnt (OMnt) and epoxy resin (EP) as raw materials, which showed good smoothness, wear property and resistance to acidic and salty corrosion. The surface morphology, crystal phase, chemical composition, and microstructure of the OMnt/EP membrane were characterized by optical microscopy, small-angle X-ray diffraction, FTIR, SEM, and TEM, respectively. The results showed that the OMnt/EP membrane was constituted of OMnt and EP. The interplanar distance of OMnt was expanded from 1.44 to 5.36 nm. Electrochemical corrosive resistance of the membrane was tested with Tafel polarization curves and electrochemical impedance spectroscopy. The results showed that the thickness of the membrane had a positive effect on its anticorrosion performance. When its thickness was 0.18 mm, its corrosion voltage (Pcorr) increased along with its content of OMnt, while its corrosion current (Icorr) showed increasing, decreasing and increasing trend as the content increased from 1 to 5%, from 5 to 7% and from 7 to 9%, respectively. When its content of OMnt was the same, its Pcorr increased along with its thickness, while its Icorr decreased along with its thickness. Its maximum impedance reached 2.29 × 107 Ω, which was much greater than that of other EP membranes. Moreover, the corrosion resistance of the composite membranes decreased gradually as the immersion time increased, and the content of OMnt and the ratio of EP to OMnt could also affect the corrosion resistance of the membrane. These results show that the OMnt/EP composite membrane exhibits excellent anticorrosive property, which is highly promising for wide applications in industry. Note de contenu : - EXPERIMENTAL AND CHARACTERIZATION : Chemical regents and materials - Cation exchange capacity (CEC) of Mnt - Organics modified nano-Mnt (OMnt) - Preparation of OMnt/EP nanocomposite membrane - Characterization - Electrochemical performance - RESULTS AND DISCUSSION : XRD - SEM - TEM - Contact angle - FTIR - Tafel polarization curve - EIS - Adhesion test - Table 1 : Interlayer distance of HDA-modified Mnt with different HDA content - Table 2 : Pcorr and Icorr of OMnt/EP with different OMnt contents and thicknesses - Table 3 : EIS values of OMnt/EP with different OMnt contents and thicknesses - Table 4 : The comparison of the impedance of montmorillonite-based composite coatings DOI : https://doi.org/10.1007/s11998-021-00587-6 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00587-6.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38038 [article]

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A study on the preparation of passivating surface using bi-layer of nanostructured ZnO and silane functionalized polymer: an alternate option to chromate passivating coating / Ashok Kumar Gupta in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 4 (07/2022)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 4 (07/2022) . - p. 1101-1115 Titre : A study on the preparation of passivating surface using bi-layer of nanostructured ZnO and silane functionalized polymer: an alternate option to chromate passivating coating Type de document : texte imprimé Auteurs : Ashok Kumar Gupta, Auteur ; Surayakanta Nayak, Auteur ; Rakesh S. Moirangthem, Auteur ; T. Venugopalan, Auteur ; A. N. Bhagat, Auteur ; Tapan Kumar Rout, Auteur Année de publication : 2022 Article en page(s) : p. 1101-1115 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. Anticorrosifs Anticorrosion Caractérisation Corrosion Hydrophobie Métaux -- Revêtements protecteurs Nanostructures Oxyde de zinc Passivité (Chimie) Polydiméthylsiloxane Le polydiméthylsiloxane —[O-Si(CH3)2]n—, ou poly(diméthylsiloxane) selon la nomenclature systématique, communément appelé PDMS ou diméthicone, est un polymère organominéral de la famille des siloxanes souvent présent dans les shampoings. On l'y ajoute pour augmenter le volume des cheveux mais il peut également aller boucher les pores du cuir chevelu et rendre les cheveux gras. C'est une des raisons pour lesquelles se laver les cheveux tous les jours est très déconseillé avec un shampooing contenant des silicones. Il existe également de l'amodiméthicone, qui est un dérivé du diméthicone. Le polydiméthylsiloxane est un additif alimentaire (E900), utilisé comme antimoussant dans les boissons (Coca-Cola BlāK). La chaîne de poly(diméthylsiloxane) forme également la structure de base des huiles et des caoutchoucs silicones. Revêtements organiques Silanes Index. décimale : 667.9 Revêtements et enduits Résumé : A novel bilayer coating was developed over flat steel surface using a simple solution dipping method. Zinc oxide nanostructure (ZnO-NS) on the surfaces of flat steel was grown by chemical treatment with zinc nitrate hexahydrate [Zn(NO3)·6H2O] and hexamethylenetetramine (HMTA, C6H12N4) in aqueous solution, followed by a thin-layer deposition of amine-terminated poly-dimethylsiloxane (PDMS-NH2). We noticed surface passivation, surface hydrophobicity, and anti-corrosion properties by this robust bilayer concept where both chemical and physical effects were present. The surface properties were measured by contact angle and scanning electron microscope. This nanostructured grown mild steel, i.e., cold-rolled closed annealed steel, was compared with nanostructure grown over zinc-coated steel, i.e., galvannealed and galvanized iron. Different flat-coated specimens were characterized by Fourier transform infrared spectroscopy. The formation of ZnO-NS on steel substrate was confirmed by XRD analysis. The corrosion behavior of the different specimens was also studied through DC polarization and electrochemical impedance spectroscopy. An excellent intact bilayer coating was proposed in the interest of structural and automotive applications. Note de contenu : - EXPERIMENTAL SECTION : Materials used - Preparation of ZnO-NS on steel surfaces (GA, GI, and CRCA) - Coating solution preparation - Coated sample/specimen preparation - CHARACTERIZATION - RESULTS AND DISCUSSION : Scanning electron microscopy (SEM) study - X-ray diffraction analysis - Fourier transform infrared (FTIR) spectroscopy - Contact angle measurement - Electrochemical impedance spectroscopy (EIS) study - Polarization study - Table 1 : Details about substrates used for the preparation of different specimens - Table 2 : EDS elemental composition of different coated samples - Table 3 : EIS parameters of coated steel substrates during test under 3.5% NaCl solution - Table 4 : Electrochemical data for different samples in 3.5% NaCl solution by DC polarization fittings DOI : https://doi.org/10.1007/s11998-021-00588-5 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00588-5.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38039 [article]

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Observation of OW · WO emulsion coating film formed by doctor blade applicator / Yasunori Sato in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 4 (07/2022)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 4 (07/2022) . - p. 1117-1126 Titre : Observation of OW · WO emulsion coating film formed by doctor blade applicator Type de document : texte imprimé Auteurs : Yasunori Sato, Auteur ; Taichiro Singai, Auteur ; Kota Hatakeyama, Auteur ; Shiro Wakaki, Auteur ; Tsutomu Takahashi, Auteur ; Akio Nasu, Auteur Année de publication : 2022 Article en page(s) : p. 1117-1126 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Couches minces Emulsions Enrobage (technologie) Microscopie à force atomique Revêtements Séchage Index. décimale : 667.9 Revêtements et enduits Résumé : In this study, OW · WO emulsions, which are similar to the product formulation, were used for thin film deposition at high speeds. The evaluation of the developed thin films showed that the shear process during the application of OW emulsions caused coalescence deformation, which was related to the nonuniformity of the properties of the applied films. In contrast, the WO emulsion, which did not deform on the shear surface, formed a uniform coating film under all conditions from coating to drying. Therefore, it is important to determine a rheological measurement method to predict the unification processes of a product design that considers the coating properties. Note de contenu : - EXPERIMENT : Sample -Coating device - Confocal laser microscope - Atomic force microscope (AFM) - RESULTS AND DISCUSSION : Homogeneity of the coating film at different observation scales - Observation of emulsified particles in shear plane - Simple prediction of coating properties using rheological measurements DOI : https://doi.org/10.1007/s11998-021-00590-x En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00590-x.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38040 [article]

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Marine biofouling resistance rating using image analysis / Morten Pedersen in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 4 (07/2022)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 4 (07/2022) . - p. 1127-1138 Titre : Marine biofouling resistance rating using image analysis Type de document : texte imprimé Auteurs : Morten Pedersen, Auteur ; Claus Erik Weinell, Auteur ; Burak Ulusoy, Auteur ; Kim Dam-Johansen, Auteur Année de publication : 2022 Article en page(s) : p. 1127-1138 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse d'image L'analyse d'image est la reconnaissance des éléments contenus dans l'image. Il ne faut pas confondre analyse (décomposition en éléments) et traitement (action sur les composantes) de l'image. Marines (peinture) Résistance à la salissure Revêtements antisalissures Salissures biologiques Index. décimale : 667.9 Revêtements et enduits Résumé : Biofouling on ship hulls can cause increased fuel consumption and the global spread of nonindigenous species. The shipping industry utilizes fouling control coatings (FCC) to prevent biofouling from occurring on the ship hull. The evaluation standards for the performance of FCC are based on manual inspections, which unavoidably induce some degree of subjectivity. A standardized biofouling recognition model using image analysis would provide a more objective basis for the evaluation of FCC. For this purpose, several coated panels were immersed in the ocean at CoaST Maritime Test Centre for an exposure period of six weeks, whereafter, the panels were fully covered with biofouling. The program ilastik was then successfully used to train a pixel classification model, which could provide a simple segmentation of the different biofouling categories detected on a coated surface. From the simple segmentation, a coverage percentage of biofouling was determined. The percentages can stand alone to provide information on the degree of biofouling or be used in combination with the guidelines from the European Chemicals Agency to calculate a fouling resistance rating (FRR). The FRR obtained from the model was compared with FRR values obtained from the manual evaluation of the panels. Note de contenu : - METHOD : Exposure procedure - Fouling resistance rating (FRR) - Image analysis procedure - RESULTS : Deviation in manual evaluations - Pixel classification model - Comparison of manual and model FRR - DISCUSSION : Challenges related to panel imaging - Pixel classification model - Time efficiency - ECHA guideline - Future work - Table 1 : The weighted ratings, used to determine the FRR, for the different categories of biofouling related to the coverage intervals. A modification of the tables from ECHA - Table 2 : Summary of the FRR for all the panels achieved from the model and the manual evaluation. The ratings in the brackets show the manual evaluation DOI : https://doi.org/10.1007/s11998-021-00612-2 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00612-2.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38041 [article]

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The nano building blocks approach for modification of surface properties of nanocomposite inorganic-organic films / Jana Pagacova in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 4 (07/2022)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 4 (07/2022) . - p. 1139-1147 Titre : The nano building blocks approach for modification of surface properties of nanocomposite inorganic-organic films Type de document : texte imprimé Auteurs : Jana Pagacova, Auteur ; Iveta Papucova, Auteur ; Alfonz Plsko, Auteur ; Katarina Faturikova, Auteur Année de publication : 2022 Article en page(s) : p. 1139-1147 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Angle de contact Caractérisation Dip-coating Hydrophobie Matériaux hybrides Morphologie (matériaux) Nanoparticules Sol-gel, Procédé Taille des particules Index. décimale : 667.9 Revêtements et enduits Résumé : This work deals with utilization of nano building blocks (NBBs) approach for modification of properties of nanocomposite inorganic-organic films. Using the NBBs approach and acid-catalyzed reactions of tetraethoxysilane and triethoxy(octyl)silane, different procedures were used for preparation of six sols. Besides three different ways of mixing of initial precursors, two temperatures with different reaction time were used. The films were prepared by dip-coating technique and treated at temperature of 170°C. The sols were characterized by method of dynamic light scattering. The surface of films was characterized by atomic force microscopy and sessile drop technique. The influence of sol preparation procedure and reaction conditions on particles size in sols as well as the properties of films surface, such as hydrophobicity, morphology and rms-roughness, was observed. The procedure of sol preparation markedly influences the surface morphology of prepared nanocomposite inorganic-organic films. The changes in the studied properties were mainly observed for films, which were deposited from sols prepared at boiling temperature of isopropyl alcohol. Note de contenu : - EXPERIMENTAL : Preparation of sols - Preparation of films - Characterization - RESULTS AND DISCUSSION : Particles size in sol - Contact angle of water - AFM DOI : https://doi.org/10.1007/s11998-021-00592-9 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00592-9.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38042 [article]

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Effect of coating pigment type on paper printability with water-based inks / Arif Ozcan in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 4 (07/2022)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 4 (07/2022) . - p. 1149-1157 Titre : Effect of coating pigment type on paper printability with water-based inks Type de document : texte imprimé Auteurs : Arif Ozcan, Auteur ; Sinan Sonmez, Auteur ; Dogan Tutak, Auteur Année de publication : 2022 Article en page(s) : p. 1149-1157 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Carbonate de calcium Le carbonate de calcium (CaCO3) est composé d'un ion carbonate (CO32-) et d'un ion calcium (Ca2+), sa masse molaire est de 100,1 g/mole. C'est le composant principal du calcaire et de la craie, mais également du marbre. C'est aussi le principal constituant des coquilles d'animaux marins, du corail et des escargots. Encre d'imprimerie Encre en phase aqueuse Formulation (Génie chimique) Kaolin Liants Papier et carton couché Pigments Pigments inorganiques -- Analyse Revêtements en papier Sérigraphie Index. décimale : 667.9 Revêtements et enduits Résumé : Nowadays, the need for papers and cardboards with improved surface properties is increasing with the development of the packaging industry. The improvements made are not only limited to the paper and paper surface, but also environmentalist approaches are exhibited in printing ink. For this purpose, the use of water-based ink tends to become widespread, especially in food packaging. In this study, five different paper coating formulations were prepared using different proportions of precipitated calcium carbonate (PCC) and kaolin pigments. Latex (Acronal S360D) was used as a binder. All prepared coating mixes were applied onto the base paper surface. All coated papers were also subjected to the calendering process. In addition, three different dyestuffs (14, 17, 20%) concentrations of water-based printing inks were prepared. Prints were made by the silk screen printing technique on the calendered-coated papers. The optical and physical properties (roughness, air permeance, paper gloss and printing gloss, contact angle and surface energy) of all papers were measured according to the standards. Paper gloss, print gloss, ΔE00 color differences, contact angles and surface energy measurements were made, and the effects of dye ratio on printing and gloss in water-based inks and coating type suitable for printability were investigated. As a result, papers can be coated and even calendered to achieve better paper surface properties and printability. In the case of printing with water-based inks, better printability properties are obtained by choosing PCC pigmented coated papers. Note de contenu : - Materials - Paper coating formulations - Optical and physical properties of papers - Preparing water-based ink - Printing conditions - Color properties - Table 1 Paper coating formulations - Table 2 The characteristics of the mineral pigments - Table 3 The characteristics of the binder (Acronal S360D) - Table 4 Formulations of water-based printing inks - Table 5 : SEM-EDAX chemical content results of paper samples coated with formulations of different pigment composition - Table 6 : Total surface energy and contact angle values according to ASTM D5946 method - Table 7 : The difference between the color of the papers printed according to the CIE ΔE 2000 euclidean color-difference formula DOI : https://doi.org/10.1007/s11998-021-00593-8 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00593-8.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38043 [article]

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Synthesis and application of nano-organosilicon coating through cyclonic plasma deposition on a polymeric separator for lithium-ion batteries / Li-Yu Wu in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 4 (07/2022)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 4 (07/2022) . - p. 1159-1170 Titre : Synthesis and application of nano-organosilicon coating through cyclonic plasma deposition on a polymeric separator for lithium-ion batteries Type de document : texte imprimé Auteurs : Li-Yu Wu, Auteur ; Fang-Yi Chung, Auteur ; Chun Huang, Auteur Année de publication : 2022 Article en page(s) : p. 1159-1170 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Accumulateurs lithium-ion Electrochimie Enrobage (technologie) Organosilicones Plasma à pression atmosphérique Un plasma à pression atmosphérique (ou plasma à PA ou plasma froid) est le nom donné à une catégorie spéciale de plasma pour lequel la pression approche celle de l’atmosphère. Le plasma à pression atmosphérique marque une nette différence avec le plasma basse et haute pression. En effet, contrairement à ces derniers aucune enceinte de traitement n'est nécessaire. Ce type de plasma peut donc être utilisé directement sur ligne de production, évitant ainsi l'utilisation de vide qui est extrêmement onéreuse. Résistance thermique Revêtements organiques Index. décimale : 667.9 Revêtements et enduits Résumé : This study focuses on the vacuum-free deposition of nano-organosilicon coating through cyclonic plasma deposition on polymeric separators for application in lithium-ion batteries. Optical emission spectroscopy was used to determine various chemical plasma species and the association of the cyclonic plasma deposition of nano-organosilicon coating. The surface detections by ATR-FTIR and XPS revealed that the plasma power is the main reason affecting nano-organosilicon coating from organic to more inorganic features. The cyclonic-plasma-deposited nano-organosilicon coating was applied to the surface of a polymeric lithium-ion battery separator. The surface characteristics of the altered separator were analyzed through ATR-FTIR, TGA, EIS, and uptake test. The results indicated that the deposition of the nano-organosilicon coating on the separator surface improved the heat resistance and electrochemical performance of the polymeric separator. The synergistic effect of the cyclonic-plasma-coated separator was observed; that is, the electrolyte uptake of the cyclonic-plasma-coated separators was larger than that of a commercial separator. Note de contenu : - Table 1 : Porosity of the Ar/HMDSN mixture cyclonic-atmospheric-pressure-plasma-deposited organosilicon coating as a function of plasma power inputs - Table 2 : Atomic percentage ratio of Ar/HMDSN mixture atmospheric pressure plasma cyclone-deposited organosilicon coating with different as a function of plasma power inputs - Table 3 : Curve fit of XPS Si2p spectra of the Ar/HMDSN mixture cyclonic atmospheric pressure plasma deposited organosilicon coating as a function of plasma power inputs - Table 4 : Components and related parameters of the equivalent circuits containing the uncoated and Ar/HMDSN mixture cyclonic-atmospheric-pressure-plasma-coated separators DOI : https://doi.org/10.1007/s11998-021-00595-6 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00595-6.pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38044 [article]

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Preparation and characterization of PVOH/kaolin and PVOH/talc coating dispersion by one-step process / Vaishali Saroha in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 4 (07/2022)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 4 (07/2022) . - p. 1171-1186 Titre : Preparation and characterization of PVOH/kaolin and PVOH/talc coating dispersion by one-step process Type de document : texte imprimé Auteurs : Vaishali Saroha, Auteur ; Hina Khan, Auteur ; Sharad Raghuvanshi, Auteur ; Dharm Dutt, Auteur Année de publication : 2022 Article en page(s) : p. 1171-1186 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Alcool polyvinylique Angle de contact Caractérisation Kaolin Papier -- Revêtements Papier et carton couché Perméabilité Résistance à la traction Résistance aux huiles et graisses Revêtements organiques Stabilité thermique Talc Transmission de vapeur d'humidité Index. décimale : 667.9 Revêtements et enduits Résumé : The poor barrier of cellulosic paper against water vapor and oil limits its wide application as a packaging material. Lamination, extrusion, and dispersion coating are applied on paper surface to improve barrier properties. Dispersion coating can be applied to paper surface on line during paper preparation using rod coater. In the present study, an attempt has been made to increase the process speed of coating preparation by single-step process at varying pigment concentration. Coating dispersion was applied on kraft paper using laboratory rod coated and dried in hot air oven at 80°C for 5 min. Furthermore, thermal stability, water vapor barrier properties, and grease resistance of PVOH/kaolin and PVOH/talc-coated paper were studied. Additionally, the effect of single layer and bilayer coating on paper properties was also studied. Permeability model was used to predict the orientation of pigments to the surface of paper. Viscosity of both kaolin and talc-based dispersion increased with the increase in pigment concentration. Thermal studies showed that at 600°C residual mass (%) of PVOH film increased from 0.6 to 9.89% and 15% with the addition of 25% (by weight) kaolin and talc pigment. At high pigment concentration (40–50%, by weight), the highest reduction in WVTR was observed for both the pigments. Excellent coverage of paper surface and high grease resistance was observed for all coating formulations. Our study showed that talc provides better thermal and barrier properties to coated paper than kaolin. Note de contenu : - MATERIALS AND METHODS : Materials - Coating dispersion preparation - Paper coating and film preparation - Characterization - Thermogravimetric analysis (TGA) - FESEM - WVTR - KIT test - Statistical analysis - RESULTS AND DISCUSSION : Effect of pigments on rheological properties of PVOH - X-ray diffraction (XRD) - ATR-FTIR - Thermal stability - Tensile strength - Roughness and porosity of coated paper - Contact angle - Table 1 : Characteristic parameter of kaolin in PVA/kaolin nanocomposite film - Table 2 : Crystallinity index of XRD diffractogram of composite film with respect to 101 plane reflections - Table 3 : Residual mass of PVOH, PVOH/kaolin, and PVOH/talc composite film at different temperatures - Table 4 : Roughness and porosity of uncoated and coated paper - Table 5 : Contact angle of uncoated and PVOH/kaolin and PVOH/talc-coated papers - Table 6 : Grease resistance (KIT test) of single- and double-coated paper DOI : https://doi.org/10.1007/s11998-021-00596-5 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00596-5.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38045 [article]

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Fabricating superhydrophobic surfaces via coating amine-containing fluorinated emulsion and Michael addition reaction / Jiajia Yuan in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 4 (07/2022)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 4 (07/2022) . - p. 1187-1198 Titre : Fabricating superhydrophobic surfaces via coating amine-containing fluorinated emulsion and Michael addition reaction Type de document : texte imprimé Auteurs : Jiajia Yuan, Auteur ; Xue Yin, Auteur ; Zelin Qiu, Auteur ; Yujie Shen, Auteur ; Lifeng Fang, Auteur ; Zhiying Liang, Auteur ; Qingran Kong, Auteur ; Baoku Zhu, Auteur Année de publication : 2022 Article en page(s) : p. 1187-1198 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Amines Une amine est un composé organique dérivé de l'ammoniac dont certains hydrogènes ont été remplacés par un groupement carboné. Si l'un des carbones liés à l'atome d'azote fait partie d'un groupement carbonyle, la molécule appartient à la famille des amides. Découvertes en 1849, par Wurtz les amines furent initialement appelées alcaloïdes artificiels. On parle d'amine primaire, secondaire ou tertiaire selon que l'on a un, deux ou trois hydrogènes substitués. Par exemple, la triméthylamine est une amine tertiaire, de formule N(CH3)3. Typiquement, les amines sont obtenues par alkylation d'amines de rang inférieur. En alkylant l'ammoniac, on obtient des amines primaires, qui peuvent être alkylées en amines secondaires puis amines tertiaires. L'alkylation de ces dernières permet d'obtenir des sels d'ammonium quaternaire. D'autre méthodes existent : 1. Les amines primaires peuvent être obtenues par réduction d'un groupement azoture, 2. Les amines peuvent aussi être obtenues par la réduction d'un amide, à l'aide d'un hydrure, 3. L'amination réductrice permet l'obtention d'amines substituées à partir de composés carbonylés (aldéhydes ou cétones), 4. Les amines primaires peuvent être obtenues par la réaction de Gabriel. Caractérisation Fluor Hydrophobie Michael, Addition de L'addition de Michael ou réaction de Michael est une réaction qui permet la création de liaisons carbone-carbone, voire de liaisons carbone-soufre. Il s'agit de l'addition nucléophile d'un carbanion sur un composé carbonylé α,β insaturé (aldéhyde, cétone et même ester α,β insaturé, des nitriles et des amides α,β insaturés pouvant aussi être utilisés). Elle appartient à la famille des additions nucléophiles conjuguées. Cette réaction doit son nom au chimiste américain Arthur Michael. Polyacrylates Revêtements en phase aqueuse Revêtements organiques Index. décimale : 667.9 Revêtements et enduits Résumé : In this work, highly fluorinated acrylate emulsions with reliable stability emulsified by protonated octadecylamine were successfully synthesized. With appropriate protonation, the obtained emulsion showed high monomer conversions up to 90.2% and ultralow surface energy. The ultralow-surface-energy coatings were fabricated via surface enrichment of abundant fluorine and replacing hydrophilic amino groups with hydrophobic groups through the Michael addition reaction. Superhydrophobic and self-cleaning surfaces were prepared on porous substrates through dip coating. When fabricated on porous glass fiber nonwoven mats, surfaces coated with enriching fluorinated side chains and few hydrophilic groups showed remarkable superhydrophobicity with a water contact angle more than 150º and a low sliding contact angle of 4.7°. The usage of fluorinated emulsions was sharply reduced due to the addition of perfluorinated acrylate. Moreover, the Michael acceptors were alternative such as perfluorinaed acrylates, long aliphatic acrylates and crosslinking acrylates, displaying superior hydrophobicity and waterproof properties. All the results conclusively indicated that this practical modified method was promising for potential applications of hydrophobic modifications. Note de contenu : - EXPERIMENTAL : Materials - Synthesis of the fluorinated acrylate emulsions - Finishing the fiber - Emulsion characterization - Surface properties - RESULTS AND DISCUSSION : Emulsion characterization - The Michael addition - Hydrophobic comparison - Hydrophobic performance - Analysis of chemical compositions - Other Michael acceptors - Table 1 : Summary of superhydrophobic coatings, finishing on fiber surface and fluorinated acrylic resin emulsions - Table 2 : Chemical and physical properties of synthesized samples - Table 3 : Contact angles and surface energy of synthesized samples - Table 4 : Surface chemical composition of the glass fibers before and after coating DOI : https://doi.org/10.1007/s11998-021-00600-y En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00600-y.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38046 [article]

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Study on surface wetting property regulation of greenhouse film and its antifogging performance / Dapeng Fu in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 4 (07/2022)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 4 (07/2022) . - p. 1199-1209 Titre : Study on surface wetting property regulation of greenhouse film and its antifogging performance Type de document : texte imprimé Auteurs : Dapeng Fu, Auteur ; Zhenzhen Chu, Auteur ; Xuening Fan, Auteur ; Zhengfeng Jia, Auteur ; Mouyong Teng, Auteur Année de publication : 2022 Article en page(s) : p. 1199-1209 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Alginate de sodium L'alginate de sodium ou polymannuronate sodique, de formule NaC6H7O6 est un additif alimentaire (E401) utilisé dans les boissons, constitué d’alginate et de sodium. Il se présente sous forme de poudre blanche à blanc crème, inodore et sans saveur, très soluble dans l'eau. C'est une longue molécule extraite d'algues brunes, constituée d'unités de glucides reliées ensemble pour former une chaîne. Caractérisation Dioxyde de silicium Mouillage (chimie des surfaces) Nanoparticules Résistance à l'abrasion Revêtements anti-buée Index. décimale : 667.9 Revêtements et enduits Résumé : In order to eliminate the effects caused by fog, sodium alginate (SA)/nano-SiO2 antifogging coating was prepared by solution blending method. The effects of coating components on its wettability and antifogging effects were investigated. Importantly, a method for evaluating the antifogging properties of membrane was developed, namely wet and dry cycles (WDC). It was found that the higher the content of nano-SiO2, the lower the contact angle of the coating, and the best antifogging effect was achieved. When the ratio of SA and nano-SiO2 was 4:3, the antifogging duration could be more than 144 h under water mist at 60°C. The antifogging coating retains antifogging effect after 10 cycles of test. However, after 20 cycles of WDC, a small amount of fine droplets started to appear, and XPS energy spectrum analysis found that the SA component in the coating almost completely disappeared, indicating that SA is the main reason for preserving antifogging performance under WDC conditions. Interestingly, after 20 cycles of reciprocal rubbing of the coating with a sponge, the surface contact angle rose by 23.4° and still had antifogging effect, indicating that the coating has excellent mechanical strength. Note de contenu : - EXPERIMENTAL SECTION : Materials - Preparation - Characterization - RESULTS AND DISCUSSION : Infrared spectral analysis - Surface morphology - Surface wettability - Antifogging test - WDC and abrasion resistance test - X-ray photoelectron spectroscopy - Effect of WDC and friction experiments on wettability - Table 1 : Mass ratio of SA and SiO2 in the antifogging coating - Table 2: Assignments of FTIR absorption bands of antifogging films - Table 3 : Summary of XPS measurements DOI : https://doi.org/10.1007/s11998-021-00601-x En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00601-x.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38047 [article]

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Micrometric array integrated with slippery liquid-infused porous surface for improved anti-icing durability / Shuang Xi in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 4 (07/2022)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 4 (07/2022) . - p. 1211-1218 Titre : Micrometric array integrated with slippery liquid-infused porous surface for improved anti-icing durability Type de document : texte imprimé Auteurs : Shuang Xi, Auteur ; Yuzhou Zhang, Auteur ; Yutu Yang, Auteur ; Xianhua Tan, Auteur Année de publication : 2022 Article en page(s) : p. 1211-1218 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation Dioxyde de titane Glissance Mesure du caractère glissant d'une surface Matériaux nanoporeux Revêtements antigel Index. décimale : 667.9 Revêtements et enduits Résumé : Recently, slippery liquid-infused porous surfaces (SLIPS) have attracted extensive attention due to their excellent anti-icing performance. However, the unsatisfactory durability resulting from the loss of lubricant hinders its practical application. Here, a micro/nanointegrated lubricant-infused surface combining microcone hole array and TiO2 porous nanostructure (P-SLIPS) was fabricated, where its inverted pyramid-shaped microgroove can protect the nanoporous structure from being damaged. Experimental results show that with the aid of microcone hole array, the sanding repelling properties of P-SLIPS have dramatically improved with the significantly decreased ice adhesion strength after 7 sanding cycles. In the process of droplet scouring and dynamic icing, the icing phenomenon in P-SLIPS did not occur even after 10 sanding cycles, while this value is 3 sanding cycles in SLIPS. All of these could be attributed to the introduction of microcone array structure, which makes the coating not be completely damaged during the icing/deicing and sanding polishing processes. Thus, the anti-icing durability of the P-SLIPS can be greatly improved. Note de contenu : - Materials - Preparation of P-SLIPS - Characterization - Surface anti-icing performance DOI : https://doi.org/10.1007/s11998-021-00602-w En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00602-w.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38048 [article]

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Improving anticorrosion performance of epoxy coating by hybrids of rGO and g-C3N4 nanosheets / Zhuang Liu in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 4 (07/2022)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 4 (07/2022) . - p. 1219-1232 Titre : Improving anticorrosion performance of epoxy coating by hybrids of rGO and g-C3N4 nanosheets Type de document : texte imprimé Auteurs : Zhuang Liu, Auteur ; Rongtao Zhu, Auteur ; Xinxi Zhang, Auteur ; Haiyang Zhu, Auteur Année de publication : 2022 Article en page(s) : p. 1219-1232 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Anticorrosifs Anticorrosion Electrochimie Epoxydes Nanoparticules Nitrure de carbone graphitique Oxyde de graphène Revêtements en phase aqueuse -- Additifs Revêtements organiques Revêtements protecteurs Index. décimale : 667.9 Revêtements et enduits Résumé : Applications of reduced graphene oxide (rGO) in epoxy (EP) anticorrosion coatings are hindered by its poor dispersibility and galvanic corrosion hazard with the metal matrix. With an excellent water dispersibility, the acid-treated g-C3N4 nanosheets (CNNS) can be physically combined with rGO through ultrasonic treatment so as to enhance the dispersion of rGO in waterborne epoxy. The structure and morphology of the new hybrids prepared by this simple ultrasonic treatment were characterized through FTIR, Raman, XRD, XPS, and TEM. The results show that the best anticorrosion performance of the coating is achieved in 0.5 M sulfuric acid when the mass ratio of CNNS and rGO in the hybrid is 1:5. Compared with the case of pure EP coating, the corrosion current density of the new hybrid decreases by one order of magnitude, and electrochemical impedance increases by nearly two orders of magnitude. The new CNNS@rGO hybrid prepared by a simple ultrasonic method has broad prospects in the field of waterborne epoxy resin anticorrosive coatings. Note de contenu : - EXPERIMENTAL METHOD : Materials - Preparation of CNNS and CNNS@rGO hybrid - Preparation of CNNS@rGO nanocomposite coating - Instruments and characterization - RESULTS AND DISCUSSION : Dispersibility of CNNS and rGO hybrids with different mass ratios - Chemical composition and microstructure - Coating interface state - EIS study of coatings in 0.5 M H2SO4 solution - Corrosion-resistant mechanism of the coatings - Table 1 : Detailed proportion of the composite coating - Table 2 : The fitted electrochemical parameters extracted from EIS experimental data - Table 3 : Electrochemical parameters obtained from the fitted sample polarization curve data DOI : https://doi.org/10.1007/s11998-021-00603-9 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00603-9.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38049 [article]

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Preparation of polysiloxane coating for laser application with improved curing property based on copolymerization modification / Tian-Yu Wang in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 4 (07/2022)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 4 (07/2022) . - p. 1233-1241 Titre : Preparation of polysiloxane coating for laser application with improved curing property based on copolymerization modification Type de document : texte imprimé Auteurs : Tian-Yu Wang, Auteur ; Wei Yang, Auteur ; Hao-Hao Hui, Auteur ; Xiang-Yang Lei, Auteur ; Qing-Hua Zhang, Auteur ; Jian Wang, Auteur ; Qiao Xu, Auteur ; Xue-Ran Deng, Auteur Année de publication : 2022 Article en page(s) : p. 1233-1241 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation Copolymérisation Lasers -- Applications industrielles Nanoparticules Revêtement antireflet Revêtements -- Propriétés mécaniques Revêtements multicouches 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. Silicones Les silicones, ou polysiloxanes, sont des composés inorganiques formés d'une chaine silicium-oxygène (...-Si-O-Si-O-Si-O-...) sur laquelle des groupes se fixent, sur les atomes de silicium. Certains groupes organiques peuvent être utilisés pour relier entre elles plusieurs de ces chaines (...-Si-O-...). Le type le plus courant est le poly(diméthylsiloxane) linéaire ou PDMS. Le second groupe en importance de matériaux en silicone est celui des résines de silicone, formées par des oligosiloxanes ramifiés ou en forme de cage (wiki). Sol-gel, Procédé Index. décimale : 667.9 Revêtements et enduits Résumé : The sol-gel method is an important process for the preparation of laser frequency conversion components, such as dihydrogen phosphate (KDP), which are often employed in high-power laser facility. Methyltriethoxysilane (MTS) precursor is a typical matrix to prepare polysiloxane under hydrolysis and polycondensation process. Further coating and curing procedure is applied to obtain desired polysiloxane coating which acts as the moisture-proof and refractive index matching layer. Subsequently, an antireflective coating is prepared over this polysiloxane coating (a bilayer coating system) to realize ultrahigh transmission at desired wavelengths. Due to the low curing temperature (limited by the phase transition temperature of KDP), current MTS-polysiloxane coating could not be completely cured and inter-coating permeation between this bilayer coating system would lead to deterioration of coating properties. Thus, copolymerization of MTS and tetraethylorthosilicate (TEOS) is adopted to fabricate the polysiloxane coating with improved curing property (denser structure and higher hardness after curing). It is found that under certain molar ratio of MTS to TEOS, the structure of modified polysiloxane coating could be effectively densified and the coating hardness increases significantly. Meanwhile, the bilayer coating system still exhibits excellent transmission, high laser-induced damage threshold as well as satisfactory moisture resistance. Note de contenu : - MATERIALS AND METHODS : Materials - Synthesis of polysiloxane solution - Preparation of silica nanoparticle sol - Fabrication of polysiloxane coating and antireflective bilayer coating system - Characterization - RESULTS AND DISCUSSION : Synthesis process - Molecular structure of polysiloxane - Mechanical properties - Bilayer performance DOI : https://doi.org/10.1007/s11998-021-00605-7 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00605-7.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38050 [article]

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Fabrication of multifunctional smart polyester fabric via electrochemical deposition of ZnO nano-/microhierarchical structures / U. G. Mihiri Ekanayake in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 4 (07/2022)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 4 (07/2022) . - p. 1243-1253 Titre : Fabrication of multifunctional smart polyester fabric via electrochemical deposition of ZnO nano-/microhierarchical structures Type de document : texte imprimé Auteurs : U. G. Mihiri Ekanayake, Auteur ; K. E. D. Y. Taniya Dayananda, Auteur ; Nadeesha Rathuwadu, Auteur ; M. M. M. G. Prasanga G. Mantilaka, Auteur Année de publication : 2022 Article en page(s) : p. 1243-1253 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Capteurs (technologie) Couches minces Dépôt électrolytique Electrochimie Hydrophobie Matériaux intelligents Oxyde de zinc Photochimie Polyesters Protection contre le rayonnement ultraviolet Textiles et tissus synthétiques Index. décimale : 667.9 Revêtements et enduits Résumé : Advanced multifunctional surfaces are widely used due to their unique surface properties and widespread applications. Developing a multifunctional fabric with a low cost, fluorine-free, and easily controllable method is a great challenge. This paper reports a multifunctional fabric with conductive, UV blocking, superhydrophobic and photosensing properties via an electrodeposition method. ZnO nano-/microarchitectures have been electrodeposited on polyester fabric with a carbon black screen-printed conductive layer. The deposition was carried out in various operating parameters. The optimized conditions for the ZnO electrodeposition are at − 1.0 V for 30 min deposition time in 5 mM Zn(NO3)2 in 0.1 M KNO3 at room temperature. The developed fabric showed 100% UV radiation blocking and a water contact angle (WCA) of 156° after self-assembly of stearic acid on the ZnO layer. The modified fabric showed fast photoresponse as a photosensor, which indicates that this can be used as flexible wearable photosensors in practical applications. Note de contenu : - MATERIALS AND METHODS : Materials - Preparation of the conductive fabric (CF) - Deposition of ZnO nanostructures - Depositing superhydrophobic layer - Characterization techniques - RESULTS AND DISCUSSION : Electrochemical deposition of ZnO - Elemental analysis - Evaluation of superhydrophobic property - Evaluation of the UV blocking property - Evaluation of the photosensing property DOI : https://doi.org/10.1007/s11998-021-00606-6 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00606-6.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38051 [article]

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Barrier and mechanical properties of water-based polyurethane-coated hydroentangled cotton nonwovens / Partha Sikdar in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 4 (07/2022)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 4 (07/2022) . - p. 1255-1267 Titre : Barrier and mechanical properties of water-based polyurethane-coated hydroentangled cotton nonwovens Type de document : texte imprimé Auteurs : Partha Sikdar, Auteur ; Shafiqul Islam, Auteur ; A vik Dhar, Auteur ; Gajanan Bhat, Auteur ; Doug Hinchliffe, Auteur ; Brian Condon, Auteur Année de publication : 2022 Article en page(s) : p. 1255-1267 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Absorption Caractérisation Coton Le coton est une fibre végétale qui entoure les graines des cotonniers "véritables"(Gossypium sp.), un arbuste de la famille des Malvacées. Cette fibre est généralement transformée en fil qui est tissé pour fabriquer des tissus. Le coton est la plus importante des fibres naturelles produites dans le monde. Depuis le XIXe siècle, il constitue, grâce aux progrès de l'industrialisation et de l'agronomie, la première fibre textile du monde (près de la moitié de la consommation mondiale de fibres textiles). Elasticité Enduction textile Hydroenchevêtrement (nontissés) Matériaux -- Propriétés barrières Nontissés Nontissés -- Propriétés mécaniques Polymères en émulsion Polyuréthanes Revêtements organiques Index. décimale : 667.9 Revêtements et enduits Résumé : Imparting new functionalities by means of coating on textiles is a step to widen the span of their characteristics and potential applications in different dimensions. Water-based polyurethanes (PU) offer unique and striking mechanical and functional features that have driven strong interest in their utility for various applications while also matching environmental sustainability needs. This research investigates the effects of PU coating on hydroentangled cotton nonwovens. The coated and uncoated nonwovens produced by various combinations were evaluated for their structure and physical properties such as fiber structure, tensile strength, water contact angle, surface energy, air permeability, pressure drop, and water absorbency. The changes in surface structure of nonwovens after coating were analyzed through scanning electron microscope. Additionally, stretchability and stretch recovery of the webs showed improvement as determined by cyclic loading and unloading tests. Cotton nonwovens generally have poor recovery due to the nature of the fiber and the web structure with very low stored energy. The results show that integration of PU on cotton nonwovens can be a promising approach to impart elasticity to cotton webs with endowed tensile strength and vast increase in recovery characteristics. Note de contenu : - EXPERIMENTAL STUDIES : Preparation of cotton webs - Coating of cotton webs with PU - Characterization - RESULTS AND DISCUSSION : Barrier properties - Tensile Properties - Stretchability and stretch recovery - Water absorbency - Water contact angle and surface energy - Scanning electron microscope (SEM) - Table 1 : Process parameters of hydroentangled cotton nonwovens - Table 2 Physical properties of water-based polyurethane - Table 3 Details of water-based PU-coated cotton nonwovens DOI : https://doi.org/10.1007/s11998-021-00609-3 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00609-3.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38052 [article]

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Pigmented silicone/epoxy novel blends for preparation of stratified nontoxic foul release coatings / Sushil S. Pawar in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 4 (07/2022)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 4 (07/2022) . - p. 1269-1285 Titre : Pigmented silicone/epoxy novel blends for preparation of stratified nontoxic foul release coatings Type de document : texte imprimé Auteurs : Sushil S. Pawar, Auteur ; R. Baloji Naik, Auteur ; Sangram K. Rath, Auteur ; T. K. Mahato, Auteur ; Balasubramanian Kandasubramanian, Auteur Année de publication : 2022 Article en page(s) : p. 1269-1285 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Alliages polymères Animaux marins Anticorrosifs Anticorrosion Caractérisation Concentration pigmentaire volumique Epoxydes Essais d'adhésion Formulation (Génie chimique) Pigments inorganiques Revêtements antisalissures Revêtements autostratifiants Revêtements organiques Silicones Les silicones, ou polysiloxanes, sont des composés inorganiques formés d'une chaine silicium-oxygène (...-Si-O-Si-O-Si-O-...) sur laquelle des groupes se fixent, sur les atomes de silicium. Certains groupes organiques peuvent être utilisés pour relier entre elles plusieurs de ces chaines (...-Si-O-...). Le type le plus courant est le poly(diméthylsiloxane) linéaire ou PDMS. Le second groupe en importance de matériaux en silicone est celui des résines de silicone, formées par des oligosiloxanes ramifiés ou en forme de cage (wiki). Index. décimale : 667.9 Revêtements et enduits Résumé : Incompatible polymer blends of epoxy and silicone were used for the preparation of single-coating system having anticorrosive and foul release properties by self-stratifying process. The single-coat application consists of a fixed 20 pigment volume concentration (PVC) anticorrosive bottom coat based on epoxy with a mixture of pigments like iron oxide, barytes, and zinc phosphate, and a fixed 10 PVC hydrophobic topcoat consisting of silicone resin and titanium dioxide pigment. Both the coatings were prepared separately in triple role and ball mill, respectively. Three different coating compositions were prepared by mixing silicone and epoxy coatings in different weight ratios (70:30, 80:20, and 90:10). Required amount of hardener, crosslinker, and catalyst were added to these prepared compositions separately prior to application and were thoroughly mixed and applied on mild steel and glass specimens. The prepared stratified coatings were named as STR-1, STR-2, and STR-3. The formation of self-stratification was confirmed by optical microscopy, FE-SEM, FTIR spectroscopy, and contact angle measurement. The coating systems were evaluated for adhesion, tensile strength, corrosion resistance, pseudobarnacle adhesion properties, and accumulation of foulant studies by immersion of test coupons in seawater. It is confirmed that there exists a most favorable stratified coating composition in terms of silicone and epoxy weight ratios which showed performance enhancement in terms of the hydrophobicity and foul release properties compared to other coating compositions. Note de contenu : - EXPERIMENTAL : Materials - Preparation of epoxy-based anticorrosive coating (bottom coat) and silicone-based fouling release coating (topcoat) - composition for 10 PVC silicone coating - Formulations of stratified fouling release coatings - CHARACTERIZATION METHODS : Physical properties - FTIR spectroscopy - Measurement of contact angle - FESEM study - Electrochemical impedance spectroscopy (EIS) - Investigation of pseudobarnacle adhesion strength - Assessment of foul release property of stratified coatings in seawater - Resistance to corrosion under cathodic protection - Table 1 : The composition for 20 PVC epoxy coating - Table 2 : The composition for 10 PVC silicone coating - Table 3 : Physical properties of stratified coatings - Table 4 : Pseudobarnacle adhesion test of stratified coatings - Table 5 : Experimental details for resistance to cathodic protection DOI : https://doi.org/10.1007/s11998-021-00610-4 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00610-4.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38053 [article]

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Validation of adhesion characterization methods for antistick coatings applied in cooking systems / Stefano Rossi in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 4 (07/2022)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 4 (07/2022) . - p. 1287-1301 Titre : Validation of adhesion characterization methods for antistick coatings applied in cooking systems Type de document : texte imprimé Auteurs : Stefano Rossi, Auteur ; Federico Valdrè, Auteur ; Massimo Calovi, Auteur Année de publication : 2022 Article en page(s) : p. 1287-1301 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Anti-adhérence (matériaux) Caractérisation Essais d'adhésion Essais de résilience Essais dynamiques Polytétrafluoréthylène Revêtements -- Propriétés mécaniques Revêtements organiques Sol-gel, Procédé Index. décimale : 667.9 Revêtements et enduits Résumé : This study aims to validate an effective methodological analysis for the characterization of the adhesion values of antistick coatings employed in cooking systems. The morphology and chemistry of four different industrial products were investigated by roughness measurements, electron microscopy observations and infrared spectroscopy analysis. The adhesion of the coatings was evaluated comparing various techniques, such as the surface contact angle measurements, the pull-off test and the single lap-joint tensile shear method, in synergy with degradation phenomena simulated by P.E.I. abrasion and dishwashing tests. The single lap-joint tensile shear test was able to evaluate evident differences between all the proposed coatings, regardless of their state of deterioration, featuring the best selectivity among the used methods. However, the pull-off test proved to be a viable and more economical alternative for fast evaluation techniques, considering the overall instrument costs. While all the polytetrafluoroethylene-based systems turned out to be totally uninfluenced by the chemical attacks performed during the dishwasher cycles, the sol–gel coating exhibited lower performances of the applied releasing agent, before and after the mechanical degradation tests. Therefore, sol–gel coatings, despite being proposed as valid alternatives to PTFE ones, do not achieve the same quality standards in terms of releasing properties, being in addition much more sensible to degradation and loss in performances. Note de contenu : - EXPERIMENTAL : Materials - Characterization - RESULTS AND DISCUSSION : Coatings characterization - Antistick properties evaluation - Wear and abrasion resistance - Antistick and degradation correlations - Table 1 : Coatings used for antistick methods validation DOI : https://doi.org/10.1007/s11998-022-00611-3 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00611-3.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38054 [article]

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