An experimental comparative study of the effect of skin type on the stability of vegetable leather under acidic condition / Alireza Koochakzaei in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIII, N° 11 (11/2018)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXIII, N° 11 (11/2018) . - p. 345-351 Titre : An experimental comparative study of the effect of skin type on the stability of vegetable leather under acidic condition Type de document : texte imprimé Auteurs : Alireza Koochakzaei, Auteur ; Hossein Ahmadi, Auteur ; Shadpour Mallakpour Année de publication : 2018 Article en page(s) : p. 345-351 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse spectrale Colorimétrie Cuir végétal Cuirs et peaux -- Propriétés mécaniques Cuirs et peaux de chèvres Cuirs et peaux de moutons Essais accélérés (technologie) Etudes comparatives Extraction (chimie) Mimosa et constituants pH -- Mesure Tanins végétaux Température de retrait Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Vegetable tanned leather is very sensitive to environmental factors, especially acidic pollutants. In addition to environmental factors, the type of animal and tannin consumed highly influences the structure and deterioration of leather. Therefore, this comparative study aimed at evaluating the stability of sheep and goat leather, tanned with mimosa extract, during the accelerated aging process. The leathers were submitted to accelerated aging for two weeks at 40°C, 50% RH and 100 ppm SO2 concentration. The attenuated total reflectance Fourier transform infrared (ATR-FTIR) spectroscopy, colorimetry, fiber-optics reflectance spectroscopy (FORS), pH measurements, investigation of mechanical properties and shrinkage temperature (Ts) were used to investigate influence of the accelerated aging condition on physical and chemical properties of leather. Results showed that sheep leather has better structural stability against acidic deterioration with compared to goat leather. While, goat leather showed higher color stability than sheep leather. Moreover, results revealed that deterioration level in grain layer was more severe than corium. Note de contenu : - Samples preparation and accelerated aging - ATR-FTIR - Tannins extraction from leather and UV-Vis spectroscopy - Colorimetry - Fibre-optics reflectance spectroscopy (FORS) - pH measurement shrinkage temperature - Mechanical properties En ligne : https://drive.google.com/file/d/1eexKpyKxbX_ihP6bvwHI2Of8KgkNT6cw/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31200 [article]

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Performance evaluation of hybrid formulations consisting of antioxidant and crosslinking agents for the treatment of acid degradation in historic vegetable-tanned leathers / Alireza Koochakzaei in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVII, N° 8 (08/2022)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXVII, N° 8 (08/2022) . - p. 330-337 Titre : Performance evaluation of hybrid formulations consisting of antioxidant and crosslinking agents for the treatment of acid degradation in historic vegetable-tanned leathers Type de document : texte imprimé Auteurs : Alireza Koochakzaei, Auteur ; Shadpour Mallakpour, Auteur ; Hossein Ahmadi, Auteur Année de publication : 2022 Article en page(s) : p. 330-337 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Acidité Antioxydants Antiquités (objets anciens) -- Analyse Antiquités (objets anciens) -- Conservation et restauration Colorimétrie Cuirs et peaux -- Détérioration Cuirs et peaux -- Entretien et réparations Essais accélérés (technologie) Formulation (Génie chimique) pH -- Mesure Réticulants Spectroscopie de réflectance Tannage végétal Température de retrait Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : This study investigated the performance of several new formulations for the treatment of acid degradation in historic leathers made with condensed tannins. This investigation was performed for four formulations consisting of collagen-stabilizing agents (oxazolidine E, resorcinol, nano alumina, and nano silica) and an antioxidant agent (Songnox 1010) in the acidic environment. The compounds were applied to 19th-century leathers with a brush. The properties of the leathers before and after treatment and accelerated aging were determined by measuring pH, shrinkage temperature, and color and conducting ATR-FTIR and FORS. For accelerated aging, the samples were exposed to an atmosphere with 95ppm SO2, 40°C, and 51% relative humidity for 14 days. The results showed that all of the tested formulations slowed down the acid degradation process. The combined use of collagen stabilizing agents provided good treatment properties and adding Songnox 1010 antioxidant agent to this combination further enhanced the effect of treatment. Among the tested formulations, the one containing oxazolidine+resorcinol+nano alumina+S1010 provided the best properties for controlling acid degradation. Note de contenu : - Samples preparation and treatment - Accelerated aging - ATR-FTIR spectroscopy - Colorimetry - Fiber-Optics Reflectance Spectroscopy (FORS) - Shrinkage temperature - pH measurement - Table 1 : Formulation of hybrid treatments applied on leathers DOI : https://doi.org/10.34314/jalca.v117i8.5983 En ligne : https://drive.google.com/file/d/1Ye-Oj-_MztdSjEzgxIUgQ7hz20gZA6sW/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37825 [article]

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