Collagen structure changes during chrome tanning in propylene carbonate / Yi Zhang in JOURNAL OF LEATHER SCIENCE AND ENGINEERING, Vol. 1 (Année 2019)  

[article]  inJOURNAL OF LEATHER SCIENCE AND ENGINEERING > Vol. 1 (Année 2019) . - 7 p. Titre : Collagen structure changes during chrome tanning in propylene carbonate Type de document : texte imprimé Auteurs : Yi Zhang, Auteur ; Jenna Kate Buchanan, Auteur ; Geoff Holmes, Auteur ; Bradley William Mansel, Auteur ; Sujay Prabakar, Auteur Année de publication : 2019 Article en page(s) : 7 p. Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse thermique Carbonate de propylène Collagène -- Structure Cuirs et peaux Diffusion de la lumière aux petits angles Tannage au chrome Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Green solvents, such as propylene carbonate (PC), can be used in leather processing to improve the efficiency of chrome tanning and reduce wastewater. Here we report a combined small-angle X-ray scattering (SAXS) and differential scanning calorimetry (DSC) study on PC and its efficacy as a carrier medium during chrome tanning. SAXS analysis on the collagen structure of chrome tanned leather using PC, compared to conventionally tanned leather using water, showed an increase in Cr uptake in addition to the more uniform penetration of Cr through the leather cross-section. The increased binding of Cr to the collagen matrix drives the decreased hydration environment of the collagen triple helix. Furthermore, DSC studies show a uniform hydrothermal stability for the PC samples due to the more even distribution of Cr through the collagen matrix. Understanding the mechanisms by which chrome tanning occurs in non-aqueous solvents can guide us towards a more sustainable future for the leather industry. Note de contenu : - EXPERIMENTAL : Materials - Leather sample preparation - Small-angle X-ray scattering (SAXS) measurements - Differential scanning calorimetry (DSC) measurements - Percentage uptake of chromium - RESULTS AND DISCUSSION : Chromium uptake from AAS studies - SAXS peak changes with tanning - D-period changes through the leather cross-section - Changes in R6/5 - DSC studies DOI : https://doi.org/10.1186/s42825-019-0011-y En ligne : https://link.springer.com/content/pdf/10.1186/s42825-019-0011-y.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36953 [article]

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study of semidilute polymer solutions under shear by SANS, SALS and rheometry in LES CAHIERS DE RHEOLOGIE, Vol. XVI, N° 1 (10/1998)

[article]  inLES CAHIERS DE RHEOLOGIE > Vol. XVI, N° 1 (10/1998) . - p. 345-348 Titre : study of semidilute polymer solutions under shear by SANS, SALS and rheometry Type de document : texte imprimé Année de publication : 1998 Article en page(s) : p. 345-348 Langues : Anglais (eng) Catégories : Diffusion aux petits angles Diffusion de la lumière aux petits angles Phtalate de dioctyle Polystyrène Rhéologie Solutions de polymère Index. décimale : 668.9 Polymères Résumé : We study the shear induced structure of semi dilute polymer solutions nears the theta point. It can be seen by Small Angle Neutron Scattering (submicronic sizes), even for unentangled solutions. For the entangled solutions studied here, the objects coarsen in size for large shear or low temperature. They become large enough to be seen by light scattering, and even by : in other words the structure is not a simple function of the Weissenberg number, but also of the distance to the coexistence curve (phase separation) in the concentration temperature diagram. Note de contenu : - Small angle scattering, butterfly patterns and the induced structure - Is there a time temperature superposition for the shear induces structure ? : Relation with light scattering - Relation with the rheological quantities - Role of entanglements Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36538 [article]

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