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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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Study of quality of a pigment prepared by complexation of chromates recovered from treated chrome shavings and tanned splits / Soufiane Tahiri 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. 426-436 Titre : Study of quality of a pigment prepared by complexation of chromates recovered from treated chrome shavings and tanned splits Type de document : texte imprimé Auteurs : Soufiane Tahiri, Auteur ; S. Alami. Younssi, Auteur ; M. Bouhria, Auteur ; A. Messaoudi, Auteur ; A. Albizane, Auteur ; M. Azzi, Auteur Année de publication : 2001 Article en page(s) : p. 426-436 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : We have developed a process to treat chrome shavings and tanned splits. These wastes were first treated to recover as much protein as possible, and then treatment was used to transform the chromium, present in residual solid, into yellow pigment. The objective of this work was to study prepared pigment quality. Standard tests were performed to evaluate the effectiveness of this product in the paint industry. En ligne : https://drive.google.com/file/d/159cHVJbbWsfKwhQXo1JQyHvOOewXCLiG/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4349 [article]

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Synthesis of modified poly(acrylic acid-acrylonitrile) retanning agent with mannich reaction and its application / Huaxiang Yang 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. 437-443 Titre : Synthesis of modified poly(acrylic acid-acrylonitrile) retanning agent with mannich reaction and its application Type de document : texte imprimé Auteurs : Huaxiang Yang, Auteur ; Jianzhong Ma, Auteur ; Zongsui Yang, Auteur Année de publication : 2001 Article en page(s) : p. 437-443 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The modified poly(acrylic acid-acrylonitrile) (P(AA-AN)) with Mannich reaction was synthesized and characterized by 1H-NMR, 13C-NMR and IR. It was shown that the carboxyl ?-H of P(AA-AN), under the proper conditions, has enough activity to react with Mannich reagents. The resulting modified product, named ASF, was used in the retanning of goatskin garment leather. The application results of ASF showed that it can improve the dyeing property of the wet leather retanned with it and it has an excellent filling and obvious selective filling properties. The comprehensive properties of ASF were quite acceptable. En ligne : https://drive.google.com/file/d/1scnKGJVg3AzrAGDfUjHL3qD2cmYHKEAQ/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4350 [article]

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Chromium (VI) formation : thermal studies on chrome salt and chrome tanned hide powder / 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. 444-450 Titre : Chromium (VI) formation : thermal studies on chrome salt and chrome tanned hide powder Type de document : texte imprimé Auteurs : N. N. Fathima, Auteur ; Balachandran Unni Nair, Auteur ; Jonnalagadda Raghava Rao, Auteur Année de publication : 2001 Article en page(s) : p. 444-450 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : In recent times, there has been an upsurge of several reports on the detection of chromium(VI) in leather when tanning was carried out with chromium(III) salts. Various possibilities have been cited for the formation of chromium(VI) in leather. The factors which could bring about the oxidation of chromium(III) to chromium(VI) are photo ageing, thermal ageing and high pH conditions. In this study, the possibility of basic chromium sulphate (BCS) as a source for formation of chromium(VI) in leather has been explored. Thermal studies on BCS and chrome tanned hide powder were carried out at different time intervals. It was observed that oxidation of chromium(III) to chromium(VI) in BCS and chrome tanned hide powder occurred under high temperature conditions. Thus, the influence of temperature on the formation of chromium(VI) has been established. En ligne : https://drive.google.com/file/d/13U_6dnsbO1MS6QmgOkceMyt5ztHNyGLd/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4351 [article]

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