Effect of different retanning systems on surface properties of leather / Swarna Vinodh Kanth in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CII, N° 4 (04/2007)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CII, N° 4 (04/2007) . - p. 135-142 Titre : Effect of different retanning systems on surface properties of leather Type de document : texte imprimé Auteurs : Swarna Vinodh Kanth, Auteur ; A. Ipe, Auteur ; Balaraman Madhan, Auteur ; R. Venba, Auteur ; Aruna Dhathathreyan, Auteur Année de publication : 2007 Article en page(s) : p. 135-142 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : The present work attempts to analyze the surface properties of crust leathers processed using different syntans of the type phenol-naphthalene formaldehyde condensate, phenol formaldehyde, melamine formaldehyde, gluteraldehyde, styrene maleic anhydride, acrylic polymer, sulphone and heterocyclic N-methylol. Contact angles of liquid drops on the leather surfaces have been used to evaluate surface energy, acidity, basicity, polarity, work of adhesion and surface roughness. The surface energy component showed that the control crust leather without retanning is practically monopolar basic with S- = 13.02 mN/m. Acrylic polymer retanned crust leather exhibited high basic character (carreS- = 33.15 mN/m), while phenol formaldehyde retanned crust leather had the least values (S- = 1.03 mN/m). The surface behavior towards rub fastness and adhesion of finish has been significantly altered by the retanning systems in leathers and showed a good correlation with the surface properties like surface charge, polarity, roughness and work of adhesion. En ligne : https://drive.google.com/file/d/1G00lD6GLJORh9mU-qS1cQEpc3mcY2SYZ/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3362 [article]

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A new insight into the shrinkage phenomenon of hides and skins / N. N. Fathima in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCVI, N° 11 (11/2001)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. XCVI, N° 11 (11/2001) . - p. 417-425 Titre : A new insight into the shrinkage phenomenon of hides and skins Type de document : texte imprimé Auteurs : N. N. Fathima, Auteur ; Aruna Dhathathreyan, Auteur ; T. Ramasami, Auteur Année de publication : 2001 Article en page(s) : p. 417-425 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Although the art of leather making has been known to exist for ages, the physical and physico-chemical events accompanying the shrinkage phenomenon in leather and its parent substance collagen are largely unknown. In this study, to elucidate the shrinkage phenomenon in hide and leather, a model has been proposed for the total volume of the skin matrix consisting of three components: solid, liquid and air, which are expected to exhibit interfaces among them. On heating, it has been observed that the fibre structure does not collapse monotonically with the loss of moisture beyond a critical amount. Using dilatometry technique, it has been shown that amount of volume expansion on heating is 0.07 ml for 1g of hide. The phase transition leading to shrinkage in the hydrothermal shrinkage phenomenon is shown to be associated with drastic changes in volume composition and absorption of heat. About 30% change in volume has been observed due to the hydrothermal shrinkage. The effect of heat on the pore morphology of the matrix has been studied through scanning electron microscopy, which reveals changes in the macro porous structure of the matrix depending upon the moisture content. En ligne : https://drive.google.com/file/d/1Y991MOKamI1HIUo00cJggOcDBXnicrra/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4348 [article]

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Studies on the physico-chemical behavior of synthetic tanning agents in non-aqueous medium / Gladstone Christopher Jayakumar in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXII, N° 8 (08/2017)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXII, N° 8 (08/2017) . - p. 277-282 Titre : Studies on the physico-chemical behavior of synthetic tanning agents in non-aqueous medium Type de document : texte imprimé Auteurs : Gladstone Christopher Jayakumar, Auteur ; Mohammed Javid, Auteur ; Allic Raja, Auteur ; Aruna Dhathathreyan, Auteur ; Jonnalagadda Raghava Rao, Auteur Année de publication : 2017 Article en page(s) : p. 277-282 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Cuirs et peaux -- Propriétés mécaniques Cuirs et peaux -- Propriétés organoleptiques Interfaces liquide-liquide Post-tannage Solvants écologiques Syntans Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Green labelling is a high priority issue in the modern society that has lead to several green technology initiatives in day-to-day applications. Among the several industry sectors, leather industry, is known to contribute to environmental pollution. Though, there are several alternate cleaner technologies available, till date no drastic shift in methodologies of clean technology has been implemented. In our efforts to use ‘green’ methodologies, in the present investigation, we have chosen green solvents like ethanol and heptane as possible carrier medium for synthetic tanning agents in leather processing. These tanning agents are performance chemicals that impart special properties to leather depending on end applications. In this study, tunable interfacial properties that arise between the solvated syntans and different solvents + water mixtures have been employed judiciously. Representative class of synthetic tanning agents have been chosen for the evaluation. The interfacial properties of liquid/liquid (solution) have been examined to understand the influence of solvents in the post tanning applications in leather making. Physical characteristics like tensile and tear strength have been determined for experimental leathers. Results show that syntans in ethanol and heptane medium form uniform dispersion and act as diffusing vehicle. The results suggest that the bound and unbound water in the leather matrix can form interfacial tension gradient with the solvent enabling effective diffusion of the chemicals even with non-polar solvents like heptane. Physical strength characteristics of experimental leather have met standard norms. The results have demonstrated an insight into the fundamental behavior of syntans in non-aqueous medium and provide clues for real time application in leather processing. Note de contenu : - MATERIALS AND METHODS : Materials - Physicochemical characterization of solvents and their interfacial behavior with syntans - Post tanning process - Physical testing of leather samples - Evaluation of organoleptic properties - RESULTS AND DISCUSSION : Application studies - Syntans in solvent medium En ligne : https://drive.google.com/file/d/18DvqlQnJGnUWTU2Js3eRv9vHideBo_A4/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28827 [article]

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