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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