Mechanistic studies of mineral tanning - Part I : / Anthony D. Covington in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 73 (Année 1989)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 73 (Année 1989) . - p. 1-8 Titre : Mechanistic studies of mineral tanning - Part I : : Solid state aluminium-27 NMR studies and the thermodynamics of shrinking Type de document : texte imprimé Auteurs : Anthony D. Covington, Auteur ; R. A. Hancock, Auteur ; I. A. Ioannidis, Auteur Année de publication : 1989 Article en page(s) : p. 1-8 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Aluminium-27 solid state NMR spectroscopy has been applied to investigate the interactionat the molecular level of various aluminium based tanning salts with leather. High resolution and variable temperature Al-solid state NMR studies, combined with differential scanning calorimetry and kinetic studies of the shrinking of Al-tanned hide powder and sheepskin samples have clearly shown that shrinking is a kinetically controlled process, during which the synthetic crosslinks remain intact. The shrinkage temperature is determined by the size of the formed crosslinked macromolecular moieties which in turn depends on the kinetics stability of the interactions of the tanning agent with collagen. En ligne : https://drive.google.com/file/d/1nWW_-bJbgR1Pfd3BbI_FsAWZj_n39ZNi/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=8812 [article]

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Studies on the origin of hydrothermal stability : a new theory of tanning / Anthony D. Covington in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCIII, N° 4 (04/1998)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. XCIII, N° 4 (04/1998) . - p. 107-120 Titre : Studies on the origin of hydrothermal stability : a new theory of tanning Type de document : texte imprimé Auteurs : Anthony D. Covington, Auteur ; Graham Lampard, Auteur ; R. A. Hancock, Auteur ; I. A. Ioannidis, Auteur Année de publication : 1998 Article en page(s) : p. 107-120 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Research into the thermodynamics of shrinking, the process of heat denaturation of collagen or leather, has demonstrated a relashionship between the activation energy of the reaction and the conventionally measured shrinkage temperature. This reaction is independent of the tannage, concerning instead the breaking of hydrogen bonds. It is postulated that the shrinkage temperature depends on the size of crosslinked macromolecular moieties, or 'cooperating units', formed during tannage. These, in turn, depend on the nature of the tanning agent's interaction with collagen. High hydrothermal stability depends on structure-making crosslinks. These depend on the crosslinking moiety having a 'stiff' structure and there being a non labile reaction between the crosslinking moiety and the collagen. These rules constitute a new theory of tanning. Note de contenu : - The shrinking reaction - Cooperating units - Hydrothermal stability : Multiple interactions - Covalent bonds - Steric considerations - Crystallinity En ligne : https://drive.google.com/file/d/1PYet4SRyRycispwwFrxzyRTZQNg-CrFd/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4520 [article]

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