Evaluation of a mixture of castor oil and polyvinylpyrrolidone for the lubrication of dry / Gomaa Abdel-Maksoud in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 106, N° 1 (01-02/2022)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 106, N° 1 (01-02/2022) . - p. 20-31 Titre : Evaluation of a mixture of castor oil and polyvinylpyrrolidone for the lubrication of dry Type de document : texte imprimé Auteurs : Gomaa Abdel-Maksoud, Auteur ; Nareman Mahmoud Hussien, Auteur ; Nadeen Al-Arif, Auteur ; Asmaa Gouda, Auteur ; Wael S. Mohamed, Auteur ; Medhat Ibrahim, Auteur Année de publication : 2022 Article en page(s) : p. 20-31 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Chimie analytique Cuirs et peaux -- Propriétés mécaniques Evaluation Huile de ricin et constituants Mélanges (chimie) Polyvinylpyrrolidone Produits de nourriture du cuir Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Leather artifacts are to be found in varied archaeological and historical places (museums, storages, libraries, excavation areas). Improper environmental conditions (such as relative humidity, temperature, excess light, pollution etc.) and poor handling can affect such artifacts and lead to their increased hardness and dryness. This study aims to evaluate castor oil and polyvinylpyrrolidone (PVP) as individual materials and as a mixture at different concentrations for the lubrication of vegetable-tanned leathers. Accelerated heat ageing at different temperatures was used. The analytical techniques used for the evaluation process were digital light microscopy, scanning electron microscope (SEM), change of colour, attenuated total reflection - Fourier transform infrared spectroscopy (ATR-FTIR), and mechanical properties (tensile strength and elongation). Investigation of the surface morphology by microscopy proved that a low concentration of castor oil in the mixture gave good fibre distribution and the grain surface pattern was established for the treated and aged treated samples. The colour value and total colour difference of the treated and aged treated samples with a low concentration of castor oil were better than at a high concentration. ATR-FTIR proved that the castor oil and PVP mixture protects leather from deterioration as no free radicals were observed in the spectra. Mechanical property values proved that the use of the lubricant protected leather from accelerated heat ageing. It is recommended that, a mixture of castor oil and PVP with a ratio of 10:90 could be applied for the lubrication of dry vegetable-tanned leather artifacts. Note de contenu : - MATERIALS AND METHODS : Materials - Methods - RESULTS AND DISCUSSION : Digital light microscope investigation - Investigation of the surface morphology by SEM - Measurement of colour change - ATR-FTIR analysis of the treated leather with the mixture of castor oil and PVP - Measurement of mechanical properties (tensile strength and elongation) - Table 1 : Change of colour of vegetable-tanned leather samples treated with the mixture of castor oit and polyvinyl pyrrolidone before and after accelerated heat ageing - Table 2 : Tensile strength and elongation of vegetable-tanned leather samples treated with the mixture of castor oil and polyvinylpyrrolidone at different concentrations before and after accelerated heat ageing En ligne : https://drive.google.com/file/d/1e9xcGT62rjdFLdc7QkeAc98_0_EYUg-W/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36969 [article]

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A novel approach for new cost-saving durable anticorrosive and antibacterial coatings / Walaa M. Abd El-Gawad in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 5 (09/2019)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 16, N° 5 (09/2019) . - p. 1263-1281 Titre : A novel approach for new cost-saving durable anticorrosive and antibacterial coatings Type de document : texte imprimé Auteurs : Walaa M. Abd El-Gawad, Auteur ; Nivin M. Ahmed, Auteur ; Wael S. Mohamed, Auteur ; Eglal R. Souaya, Auteur Année de publication : 2019 Article en page(s) : p. 1263-1281 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Acétate de vinyle L'acétate de vinyle est l'ester de l'acide acétique (acide éthanoïque) avec le tautomère alcoolique de l'éthanal (acétaldéhyde) et de formule semi-développée, CH3COO–CH=CH2. L'acétate de vinyle est préparé, en règle générale, en phase vapeur, en faisant réagir un grand excès d'acétylène sur de l'acide acétique (200 °C) en présence de catalyseurs au zinc et au cadmium). On obtient un liquide incolore à odeur très pénétrante qui ne se polymérise en polyacétate de vinyle (PVAC) qu'en présence de catalyseurs et donne des solides durs très stables à la chaleur. Il peut être copolymérisé avec d'autres composés vinyliques ou d'autres monomères. Antibactériens Anticorrosifs Anticorrosion Copolymérisation Essais accélérés (technologie) Evaluation Matériaux -- Propriétés fonctionnelles Matériaux hybrides Métaux -- Revêtements protecteurs Spectroscopie d'impédance électrochimique Zéolites Index. décimale : 667.9 Revêtements et enduits Résumé : Multifunctional coatings that perform various actions simultaneously are now of prevailing importance, with zeolites being one of the most useful materials in this field. In this work, Na-P-zeolite was prepared from kaolin and subjected to a cation-exchange process to replace Na+ by Cu2+ and/or Zn2+ to achieve anticorrosive and antibacterial effects. In situ emulsion polymerization of vinyl acetate-vinyl versatate (VAc-VEOVA) copolymer at the nanoscale with P-zeolite and Zn-, Cu-, Zn/Cu-cation-exchanged P-zeolites was then applied to obtain P-zeolite-(VAc-VEOVA), Zn-P-zeolite-(VAc-VEOVA), Cu-P-zeolite-(VAc-VEOVA), and Zn/Cu-P-zeolite-(VAc-VEOVA) nanocomposites. Anticorrosive and antibacterial tests were then carried out on films containing the different nanocomposites using laboratory accelerated testing, electrochemical impedance spectroscopy (EIS), and the disc well diffusion method with different types of Gram-positive (G+) and Gram-negative (G−) bacteria, revealing that the film containing the mixed (Zn/Cu)-P-zeolite showed the best anticorrosive and antibacterial performance. Note de contenu : - EXPERIMENTAL : Materials - Preparation of P-zeolite - Prepration of cation-exchanged P-zeolites - Preparation of (VAc-VEOVA) copolymer nanocomposites by in situ emulsion polymerization - Paint preparation - Preparatin of steel panels for anticorrosion testing - Preparation of specimens for antibacterial testing - METHODS OF TESTING AND EVALUATION OF PAINTS : Anticorrosion measurements - RESULTS AND DISCUSSION : Characterization of P-zeolite and cation-exchanged P-zeolites - Characterization of the prepared nanocomposites - Anticorrosion performance of paints containing P-zeolite and cation-exchanged P-zeolites - Antibacterial results for cation-exchanged P-zeolites and their paint formulations DOI : 10.1007/s11998-019-00202-9 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-019-00202-9.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33010 [article]

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Organoclay-assisted vat dyeing of polypropylene nanocomposite fabrics / Yehya A. Youssef in COLORATION TECHNOLOGY, Vol. 137, N° 6 (12/2021)  

[article]  inCOLORATION TECHNOLOGY > Vol. 137, N° 6 (12/2021) . - p. 668-677 Titre : Organoclay-assisted vat dyeing of polypropylene nanocomposite fabrics Type de document : texte imprimé Auteurs : Yehya A. Youssef, Auteur ; Reham Farouk, Auteur ; Aballa A. Mousa, Auteur ; Wael S. Mohamed, Auteur ; Elisabeth Giebel, Auteur ; Michael R. Buchmeiser, Auteur Année de publication : 2021 Article en page(s) : p. 668-677 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Argile Caractérisation Colorimétrie Essais de résilience Extrusion filage Fibres textiles -- Propriétés mécaniques Fils multifilaments Matériaux hybrides Mélanges-maîtres (chimie) Montmorillonite Nanoparticules Polypropylène Teinture -- Fibres textiles synthétiques Index. décimale : 667.3 Teinture et impression des tissus Résumé : Polypropylene (PP) nanocomposite fabrics containing different types of modified montmorillonite (MMT) nanoclays were prepared by a melt compounding technique. Spinnable polymers were obtained by mixing PP master batches with 4 wt% MMT, possessing either tallow amine or tallow quaternary ammonium salt intercalating compounds with a pure untreated PP to MMT content of 0.5 wt%. After spinning, the prepared nanocomposites were drawn and knitted into fabrics for further testing and dyeing. The prepared PP nanocomposite fabrics containing hydrogenated tallow quaternary ammonium-based organomodified nanoclays exhibited higher colour strength (K/S) using vat dyes compared with those containing either octadecylamine or trimethyloctadecyl ammonium-based organomodified nanoclays and reference fabrics made from fibres spun without MMT clay content. The investigated vat dyes yielded relatively high K/S values on PP nanocomposite fabrics with very good to excellent wash, excellent fastness to bleaching with chlorine, perspiration, and good to excellent light fastness ratings. Note de contenu : - EXPERIMENTAL : Materials - Equipment - Preparation of PP/MMT master batches - Spinning of PP/MMT filaments - Vat dyeing of PP nanocomposite and reference fabrics - Colour measurements - Fastness testing - RESULTS AND DISCUSSION : Mechanical properties of multifilament fibres - Characterisation of PP/MMT master batches - Effect of organoclays on the vat dyeing of PP nanocomposite fabrics - Colorimetric data - Fastness properties of dyed PP nanocomposite fabrics with vat dyes DOI : https://doi.org/10.1111/cote.12566 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12566 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36796 [article]

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Organoclays assisted vat and disperse dyeing of poly(ethylene terephthalate) nanocomposite fabrics via melt spinning / Aballa A. Mousa in COLORATION TECHNOLOGY, Vol. 134, N° 2 (04/2018)  

[article]  inCOLORATION TECHNOLOGY > Vol. 134, N° 2 (04/2018) . - p. 126-134 Titre : Organoclays assisted vat and disperse dyeing of poly(ethylene terephthalate) nanocomposite fabrics via melt spinning Type de document : texte imprimé Auteurs : Aballa A. Mousa, Auteur ; Yehya A. Youssef, Auteur ; Wael S. Mohamed, Auteur ; Reham Farouk, Auteur ; Elisabeth Giebel, Auteur ; Michael R. Buchmeiser, Auteur Année de publication : 2018 Article en page(s) : p. 126-134 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Argile Etat fondu (matériaux) Extrusion filage Montmorillonite Nanoparticules Photostabilité Polyéthylène téréphtalate Résistance à la transpiration Résistance au nettoyage Teinture -- Fibres textiles synthétiques Textiles et tissus -- Propriétés mécaniques Index. décimale : 667.3 Teinture et impression des tissus Résumé : Polyethylene terephthalate nanocomposites containing six modified montmorillonite nanoclays were prepared by a melt compounding technique. The effect of intercalated compounds of montmorillonite on textile mechanical properties of resultant polyethylene terephthalate nanocomposite fabrics was investigated. Winding was not possible, when the polymers were first compounded with the desired amount of montmorillonite and then spun, as filament breakage occurred. Spinable polymer were only obtained by mixing polyethylene terephthalate master batches with 4 wt% montmorillonite, which contained tallow intercalating compound with pure untreated polyethylene terephthalate to a montmorillonite content of 0.5 wt%, thus decreasing the concentration of thermally degraded polymer chains. After spinning the fibres were drawn and knitted into fabric samples for further testing. The prepared polyethylene terephthalate nanocomposite fabrics using montmorillonite exhibited higher colour strength using vat and disperse dyes compared with those of the reference fabrics made from fibres spun without montmorillonite clay content and regular fabrics. The carbocyclic‐based vat dyes have higher colour strength values on polyethylene terephthalate nanocomposite fabrics if compared with heterocyclic‐based vat dyes. The colour fastness ratings for both vat and disperse dyeings secured very good to excellent washing and perspiration fastness on polyethylene terephthalate nanocomposite fabrics. All dyed fabrics showed excellent light fastness using vat and disperse dyes. The preparation of polyethylene terephthalate nanocomposite fabrics with improved textile mechanical and vat dyeing properties needs further investigations. Note de contenu : - EXPERIMENTAL : Materials - Equipment - Preparation of PET/MMT masterbatches - Spinning of PET/MMT filaments - Vat dyeing - Disperse dyeing - Colour measurement - Fastness testing - RESULTS AND DISCUSSION : Characterisation of PET/MMT masterbatches - Mechanical properties of PET nanocomposites fabric - Effect of organoclays on dyeing of PET nanocomposite fabric - Fastness properties of tyed regular, reference PET and nanocomposite fabric DOI : 10.1111/cote.12330 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12330 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30317 [article]

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