Electron microscope studies of leather-polymer systems / John R. Barlow in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 57 (Année 1973)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 57 (Année 1973) . - p. 130-136 Titre : Electron microscope studies of leather-polymer systems Type de document : texte imprimé Auteurs : John R. Barlow, Auteur ; R. Reed, Auteur Année de publication : 1973 Article en page(s) : p. 130-136 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cuirs et peaux -- Analyse Cuirs et peaux -- Finition Dispersions et suspensions Emulsifiants Emulsions Latex Microscopie électronique en transmission pH Polyacryliques Polymères en émulsion Polymérisation en émulsion Tannage au chrome Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Polymeric materials may be applied to the surface of leather, as so-called finishes, to improve the appearance and performance characteristics of the substrate. The polymers used may be natural or synthetic in origin and are applied as solutions in organic solvents or as water-based emulsions. The latter systems are usually formed from acrylic polymers and are produced as spherical particles, dispersed in an aqueous phase, by the technique of emulsion polymerisation. Transmission electron miroscopy has been used extensively to study the fine structure of leather and to characterise emulsion commonly used in leather finishing. However, with the exception of a single micrograph shown by Kanagy, studies of combined leather-polymer systems have not been carried out using this technique. This article indicates a method of preparing leather-polymer systems for study in the electron microscope, giving information on the forces of interaction operative between the species present. Note de contenu : Methods : Variation of time of contact between leather fibres and polymer particles - Variation of emulsion type and pH of leather-latex systems - RESULTS : Variation of time of contact between leather fibres and polymer dispersions - Variation of emulsifier type and pH value of th eleather/latex system - Fig. 1 : Full-chrome leather fibres plus latex 1. Time of contact in (a) less than 5 sec ; (b) 5 min ; (c) 20 min ; d) complete drying - Fig. 2 : a) Full chrome leather fibres plus latex 2, complete drying. (b) As (a) but latex 3,5 min drying. IP = individual particle. (c) As (b) but complete drying - Fig. 3 : Full-chrome leather fibres plus latex 1, with variation of the pH of the dispersion media. Time of contact = 1 min (a) pH 3.0 ; (b) pH 4.5 ; (c) pH 8.0 - Fig. 4 : Full-chrome leather fibres plus commercial anionic latex, with variation of the pH of the dispersion media. Time of contact = 1 min. (a) pH 3.0, lower magnification (scale mark = 2 microns) ; (b) pH 4.5 ; (c) pH 8.0 ; (d) pH 8.0, lower magnificatio (scale mark = 2 microns) - Fig. 5 : Full-chrome leather fibres plus commercial non-ionic latex, with variation of the pH of the dispersion media. Time of contact = 1 min. (a) pH 3.0 ; (b) pH 4.5 ; (c) pH 8.0 - Table 1 : Properties of the test latices - Table 2 : Commercial emulsions - Table 3 : Surface charges on leather fibres and particles of test latices En ligne : https://drive.google.com/file/d/1pqlM68oQTC4vttXNpQTexjHKo9lXB1eV/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31691 [article]

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Science for students of leather technology / R. Reed / Oxford [Royaume-Uni] : Pergamon Press (1966)

Titre : Science for students of leather technology Type de document : texte imprimé Auteurs : R. Reed, Editeur scientifique Editeur : Oxford [Royaume-Uni] : Pergamon Press Année de publication : 1966 Collection : A modern course in leather technology num. 1 Importance : IX-278 p. Présentation : ill. Format : 20 cm ISBN/ISSN/EAN : 978-1-4831-2722-4 Prix : 58 E Note générale : Index Langues : Anglais (eng) Catégories : Cuirs et peaux Cuirs et peaux -- Finition Cuirs et peaux -- Teinture Tannage Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : This volume is the first of a series of textbooks of leather science and technology, which in view of the parucity of books delaing with this subject, can therefore be recommended to students as reliable scientifically and as reflecting current industrial practice. This book provides a concise modern treatment of fundamentals. The method of presentation is modern since the significance of scientific knowledge in technological practice is continually stressed. Many recent advances in the cheistry of vegetable tannins, reactive dyes, chrome tanning complexes and polymer structure have been included. This book covers fundamental physical chemistry, macromolecules (including proteins and carbohydrates), lipids, skin structure, biological damage, the chemistry of chrome tanning materials, vegetable tannins, dyestuffs and pigments. It is designed to assist students at schools, colleges of technology and universities. Note de contenu : - Basic physical chemistry - Macromolecules : proteins and carbohydrates - Lipids (oils, fats and waxes) - Surface physical chemistry - Skin structure and the chemistry of collagen - Insects and micro-organisms - The chemistry of mineral tannage - Vegetable tannins and syntans - Dyestuffs and pigments Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40421

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