Advanced poly(aniline-aminosalicylic acid) nanofiber functionalized with modified GO environment friendly coatings on steel surfaces with water resistance and long-term active anticorrosion performance / Meng Wang in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 2 (03/2022)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 2 (03/2022) . - p. 625-642 Titre : Advanced poly(aniline-aminosalicylic acid) nanofiber functionalized with modified GO environment friendly coatings on steel surfaces with water resistance and long-term active anticorrosion performance Type de document : texte imprimé Auteurs : Meng Wang, Auteur ; Fengjuan Xiao, Auteur ; Longfei Kong, Auteur ; Guyu Yin, Auteur ; Changbiao Ni, Auteur ; Xuefei Zhang, Auteur ; Cheng Qian, Auteur ; Lu Yan, Auteur ; Mengya Li, Auteur ; Jun Li, Auteur ; Kaixi Zhou, Auteur Année de publication : 2022 Article en page(s) : p. 625-642 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Acier au carbone Anticorrosifs Anticorrosion Caractérisation Copolymérisation Hydrophobie Métaux -- Revêtements protecteurs Nanofibres Polyacide aniline-aminosalicylique Résistance à l'humidité:Résistance à l'eau Revêtements en phase aqueuse Revêtements organiques Index. décimale : 667.9 Revêtements et enduits Résumé : An advanced long-term active corrosion protection coating for carbon steel was proposed using poly(aniline-aminosalicylic acid) nanofiber (PACA-f) covalently linked with cetyltrimethyl ammonium bromide (CTAB)-modified graphene oxide (CTGO). The proton-doped PACA-f functionalized CTGO (PACA-f/CTGO) exhibits excellent hydrophobicity and outstanding water resistance in waterborne epoxy polymer (WEP) coatings and better compatibility with WEP due to the formation of organic–inorganic networks. PACA-f/CTGO composite coating has a self-repairing function and shows superior corrosion resistance on Q235 steel. The surface-corrosion inhibition of PACA-f/CTGO on steel was investigated by molecular dynamics simulation(MD) which confirmed the chemical adsorption of the PACA-f/CTGO on the steel surface. The excellent water resistance and anticorrosion property of PACA-f/CTGO are ascribed to the high hydrophobicity of the hybrid coatings, the formation of intelligent passivation layer after the corrosive medium invading, and the barrier performance of CTGO. Note de contenu : - EXPERIMENTAL SECTION : Materials - Preparation of PACA-f/CTGO composite - Preparation of waterborne anticorrosive coating samples - Molecular dynamics (MD) simulations - Characterization - RESULTS AND DISCUSSION : Morphological studies of CTGO, PACA-f and PACA-f/CTGO composite - Elemental composition and chemical state of the samples - XRD and UV–Vis spectroscopy analyses of PACA-f/CTGO composites - Electrochemical activity - Cross-sectional morphology of coating - Corrosion behavior DOI : https://doi.org/10.1007/s11998-021-00553-2 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00553-2.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37293 [article]

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Fluorine-containing aqueous copolymer emulsion for waterproof leather / Zhaoyang Luo in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 92, N° 3 (05-06/2008)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 92, N° 3 (05-06/2008) . - p. 107-113 Titre : Fluorine-containing aqueous copolymer emulsion for waterproof leather Type de document : texte imprimé Auteurs : Zhaoyang Luo, Auteur ; Haojun Fan, Auteur ; Lu Yan, Auteur ; Bi Shi, Auteur Année de publication : 2008 Article en page(s) : p. 107-113 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Caractérisation Copolymères Cuirs et peaux -- Finition Emulsions Fluoropolymères Imperméabilisation Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : A novel fluorine-containing aqueous copolymer emulsion, which was used for waterproof leather fatliquoring, was prepared via free radical copolymerization from maleic anhydride and natural oil (rapeseed oil and fish oil) followed by an esterification reaction with dodecafluoro heptanol and octadecyl alcohol. The reaction was monitored on-line by FTIR analysis and the combining fastness [strength of the combination] between the fatliquoring agent and leather fibre was examined by extraction with dichloromethane and water. Simultaneously, the effects of the fluorine content on contact angle (water-surface of leather), dynamic waterproofness time and static water absorption ratio of leather were also investigated. The X-ray photoelectron spectroscopy (XPS) showed that most of the hydrophobic fluorine-containing groups were orientated onto the surface of the leather and formed a hydrophobic film layer, whilst the hydrophilic carboxyl groups were enveloped in the inner layer. The fact the combination fastness is greater for the fluorine-containing copolymer than for other types of fatliquoring agents, shows that the carboxyl groups in the inner layer have coordinated with chrome(III) in the form of chemical bonding rather than by physical absorption. Chrome tanned leather treated with this type of fluorine-containing copolymer fatliquoring agent shows good durable waterproofness. When the fluorine content in fatliquoring agent is varied from 0wt% to 5wt% (based on solid content), the contact angle increases from 125° to 155°, the static water absorption ratio of leather is less than 9wt% and the dynamic waterproofness time reaches 55 minutes. Note de contenu : - MATERIALS AND METHOS : Materials - Preparation of fluorine-containing copolymer aqueous emulsion - The application of fatliquoring agent - Characterizations - RESULTS AND DISCUSSION : The on-line FTIR analysis of the synthesis - The combination fastness between the fatliquoring agent and collagen fibre - The fluorine concentration on the surface of leather - The effect of the fluorine content on contact angle of the leather - The waterproofness of leather - The possible waterproof mechanism of leather - Table 1 : Process for upper leather with fluorine-containing fatliquoring agent - Table 2 : Special groups and the FTIR adsorption peaks - Table 3 : Content of substances soluble in dichloromethane and water - Table 4 : Concentration of surface elements of leathers A and B En ligne : https://drive.google.com/file/d/1r5NeKZSaMIILBIKbGaf98X3sxxQfNsUj/view?usp=share [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38955 [article]

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Nano-SiO2-oxazolidine combination tannage-potential for chrome-free leather / Lu Yan in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 92, N° 6 (11-12/2008)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 92, N° 6 (11-12/2008) . - p. 252-257 Titre : Nano-SiO2-oxazolidine combination tannage-potential for chrome-free leather Type de document : texte imprimé Auteurs : Lu Yan, Auteur ; Zhaoyang Luo, Auteur ; Haojun Fan, Auteur ; Yuansen Liu, Auteur ; Hui Li, Auteur ; Biyu Peng, Auteur ; Bi Shi, Auteur Année de publication : 2008 Article en page(s) : p. 252-257 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Colorimétrie Croûte (cuir) On entend par "cuir en croûte" des cuirs ayant subi les opérations jusqu'au tannage, à l'exclusion de toute opération de corroyage ou de finissage, mais qui, par opposition aux wet-blue ont été séchés. Cuirs et peaux -- Propriétés mécaniques Dioxyde de silicium Formulation (Génie chimique) Liqueurs de tannage Nanoparticules Oxazolidine Post-tannage Tannage chrome free Tannage combiné Le tannage combiné se dit des tannages qui allient deux familles ou genre de tannage pour obtenir un résultat additionnant les qualités complémentaires des tannins mis en Å“uvre par exemple Chrome-Végétal ou Chrome-Synthétique Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : A novel pickle-less combination tannage based on nano-SiO2 and oxazolidine as a substitute for chrome tanning has been developed. The size and distribution of nano-SiO2 in protein, the hydrothermal stability, the mechanical properties and the antifungal effect of final leather as well as the evaluation of eco-friendly characteristics of combination tannage were investigated. Scanning Electric Microscope (SEM) analysis indicates that the distribution of nano-SiO2 in protein is even when the SiO2 concentration is lower than 5wt% (on bated pelt weight), and the size of SiO2 particles can be controlled to a range from 60 to 150nm. But when the SiO2 concentration exceeds 7wt%, most of the particles conglomerate together and the size of the SiO2 particles is larger than 400nm. Differential Scanning Calorimeter (DSC) study shows that the shrinkage temperature of final leather which is related to the content of nano-SiO2 is more than 95°C. Compared to chrome tannage, leather tanned with oxazolidine-nano-SiO2 demonstrates a higher resistance to mould than conventional wet-blue. The latter incubated for 3 days began to grow mildew, whilst the oxazolidinenano-SiO2 tanned leather which was incubated for 6 days had no mildew, showing a fine antifungal effect. Environmental impact assessment shows that the developed process exhibits significant reduction in total solids (TS) and better biodegradability of organic compounds in the effluent when compared to chrome tanning. Note de contenu : - EXPERIMENTAL PROCEDURE : Materials - Optimization of oxazolidine for pre-tanning - Oxazolidine-nano-SiO2 combination tanning - Conventional chrome tanning and post tanning process - Differential scanning calorimetry studies - Mechanical properties test of leather samples - Colour measurement - Scanning Electron Microscopic analysis - The antifungal effect of leather tanned with oxazolidine-nano-SiO2 - Analysis of spent tan liquor - RESULTS AND DISCUSSION : Optimization of oxazolidine offer - The hydrothermal stability of nano-SiO2 and oxazolidine combination tanned leather - Mechanical properties of leather tanned with oxazolidine-nano-SiO2 - Colour measurement results - The influence of nano-SiO2 content on the size and distribution of SiO2 in protein - The antifungal effect of the oxazolidine and nano-SiO2 combination tanned leather - Environmental benefits - Table 1 : Post tanning formulation for both combination tanned and chrome tanned leathers - Table 2 : Effect of oxazolidine content on Ts of leather and the penetration time of nano-precursor - Table 3 : Physical strngth of crust leathers tanned with chromium and oxazolidine-nano-SiO2 - Table 4 : Colour measurement of nano-SiO2 and oxazolidine combination tanned leather - Table 5 : Spent tan liquor analysis of oxazolidine and nano-SiO2 combination tanning - Table 6 : The relationship between BOD5/COD value and the biodegradability of an organic compound En ligne : https://drive.google.com/file/d/1-m9OGj7gCA2RNzFBn1QzBzvadXsIobnO/view?usp=share [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38995 [article]

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