Protein and leather charge / J. Guthrie-Strachan in WORLD LEATHER, Vol. 18, N° 8 (12/2005 - 01/2006)  

[article]  inWORLD LEATHER > Vol. 18, N° 8 (12/2005 - 01/2006) . - p. 19-23 Titre : Protein and leather charge Type de document : texte imprimé Auteurs : J. Guthrie-Strachan, Auteur ; Karl Flowers, Auteur Année de publication : 2005 Article en page(s) : p. 19-23 Langues : Anglais (eng) Catégories : Anions Cations Collagène Cuir pH Polyélectrolytes Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : pH is used as a control for charge throughout the collagen or leather structure. This directly influences the penetration and fixation of materials within the matrix. However, the charge of collagen/leather depends on the relationship between pH and pI (lEP). ln practice, the lower the pH in relation to the pI, the greater the positive charge of the collagen/leather, the deeper the penetration of positively charged (cationic) products, and the slower or less secure their fixation. Conversely, the higher the pH in relation to the pI, the greater the negative charge of the collagen/leather, the deeper the penetration of negatively charged (anionic) products, and the slower or less secure their fixation. Moreover, cationic, anionic and neutral materials, which interact with charges on collagen/leather, can also influence pL pI is central to many mechanisms of chemical penetration and fixation, but unfortunately it is difficult to measure. Nevertheless, the direction that chemicals shift the pI, and the effects that this has on leather charge, are essential to an understanding of wet end collagen/leather chemistry. Note de contenu : - The effect of pH on charge - The effects of change in pI - The penetration and reaction of chemicals with collagen/leather - The balance between penetration and fixation - Managing the penetration and fixation of chemicals - Panel 1 : The effect of pH change - Panel 2 : Generalisation of charges on collagen - Panel 3 : Representation of charges on collagen - Panel 4 : Representative pI values of collagen and leather - Panel 5 : Changing the pI - Panel 6 : Penetration and fixation in relation to pI - Panel 7 : Charges within neutralisation - Panel 8 : pI as tool in leathermaking En ligne : https://drive.google.com/file/d/12qhc92mFWzpxuWmeSn7tYoDFVjMcrWuR/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32499 [article]

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