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JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) . Vol. CVII, N° 7Mention de date : 07/2012Paru le : 10/07/2012 |
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Ajouter le résultat dans votre panierCharacterization of commercially available leathers using thermogravimetric analysis and Py/GC-MS system / A. Marcilla in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVII, N° 7 (07/2012)
[article]
Titre : Characterization of commercially available leathers using thermogravimetric analysis and Py/GC-MS system Type de document : texte imprimé Auteurs : A. Marcilla, Auteur ; A. N. García, Auteur ; M. León, Auteur ; E. Bañón, Auteur ; P. Martínez, Auteur Année de publication : 2012 Article en page(s) : p. 220-230 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse multivariée
Caractérisation
Cuirs et peaux -- Analyse
PyrolyseLa pyrolyse est la décomposition ou thermolyse d'un composé organique par la chaleur pour obtenir d'autres produits (gaz et matière) qu'il ne contenait pas. L'opération est réalisée en l'absence d'oxygène ou en atmosphère pauvre en oxygène pour éviter l'oxydation et la combustion (L’opération ne produit donc pas de flamme). Il s'agit du premier stade de transformation thermique après la déshydratation.
Elle permet généralement d'obtenir un solide carboné, une huile et un gaz. Elle débute à un niveau de température relativement bas (à partir de 200 °C) et se poursuit jusqu'à 1 000 °C environ. Selon la température, la proportion des trois composés résultants est différente.
ThermogravimétrieIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : The aim of this study is to use the results obtained from the pyrolysis of different commercially available leathers (using thermogravimetric analysis and a pyroprobe device) in order to obtain information about their composition, characteristics and origin. A very small amount of sample is needed to perform these experiments. The results of this work are highly promising, indicating that some specific characteristics of the samples are easily deduced from the pyrolytic results. The results indicate that phenols are related to vegetable tanning and ketones, alkanes and alkenes are related to chrome tanning. The multivariate analysis carried out allows us to distinguish the chromium tanned bovine hides and the chromium tanned goatskin among six different samples (various tanning agents and different origins). The analysis distinguishes the organic tanning from the chrome one regardless of the origin of the leather. Note de contenu : - MATERIALS AND EXPERIMENTAL EQUIPMENT : Materials - Elemental microanalyzer - Thermobalance - Pyroprobe
- EXPERIMENTAL PROCEDURE : Ultimate analysis - Thermobalance - Pyroprobe 2000 - Multivariate analysis
- RESULTS AND DISCUSSION : Ultimate analysis - Thermobalance - PyroprobeEn ligne : https://drive.google.com/file/d/1RtJcUEHF_KRqR5jd9_4KbXBTI4AP4Vqd/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15642
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Code-barres Cote Support Localisation Section Disponibilité 14063 - Périodique Bibliothèque principale Documentaires Disponible Preparation of a new itaconate based amphoteric surfactant for fatliquor applications / R. Janardhanan in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVII, N° 7 (07/2012)
[article]
Titre : Preparation of a new itaconate based amphoteric surfactant for fatliquor applications Type de document : texte imprimé Auteurs : R. Janardhanan, Auteur ; V. Vijayabaskar, Auteur ; B. S. R. Reddy, Auteur Année de publication : 2012 Article en page(s) : p. 231-242 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Produits de nourriture du cuir
Surfactants
Wet-blue (tannage)Peau tannée au chrome (le chrome donne une couleur bleue)Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Amphoteric surfactant based fatliquors are outstanding performers in the leather industry because of their excellent surfactant properties, low toxicity, good biodegradability, excellent resistance to hard water, antistatic properties, good emulsification, dispersion and compatibility with other agents. This paper reports on the preparation of a new amphoteric surfactant, diethylamino-lauryl itaconate (DEALI) through the synthesis of lauryl itaconate (LI) based anionic polymerisable surfactant (“Surfmer”). DEALI and LI were characterized by FT-IR and 1H NMR spectra. Properties of both DEALI and LI such as surface tension at different concentrations, critical micelle concentration, contact angle, surface energy, emulsification power, zeta potential and particle sizes were measured. The Isoelectric Point (IEP) of DEALI was determined. The amphoteric surfactant (DEALI) and the anionic surfactant (LI) were formulated as fatliquors and applied on wet blue cow leather, against each other. Fatliquor imparted properties on the leather were measured qualitatively and quantitatively. Scanning Electron Microscopic studies of the resultant leather was carried out and found to have better performance due to deeper penetration of the amphoteric surfactant. This work provides a lead for the development of new and better fatliquoring agents. Note de contenu : - EXPERIMENTAL : Materials - Experimental methods - Characterization methods
- RESULTS AND DISCUSSION : Analytical characterization of surfactants - FTIR characterization - H NMR characterization - Surfactants properties - Analytical characterization of fatliquors - Resultant leather propertiesEn ligne : https://drive.google.com/file/d/1mabHNvYRigD57XdwwziOvbimjetqqoN2/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15643
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Code-barres Cote Support Localisation Section Disponibilité 14063 - Périodique Bibliothèque principale Documentaires Disponible Method to extract water-soluble collagen from induced biphasic commercial gel / Matthew J. Mastauskas in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVII, N° 7 (07/2012)
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Titre : Method to extract water-soluble collagen from induced biphasic commercial gel Type de document : texte imprimé Auteurs : Matthew J. Mastauskas, Auteur ; Gennaro J. Maffia, Auteur Année de publication : 2012 Article en page(s) : p. 243-248 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Collagène -- Solubilité
Eau
Extraction (chimie)
Gel de collagèneIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : Water-soluble collagen extracted from commercial collagen gel could be a possible replacement for water-insoluble collagen fibrils, which are currently extracted from raw corium. If the water-soluble collagen proves to be a suitable replacement in the various water-insoluble collagen applications as mention in this paper, then the time-intensive milling process could be avoided. The first part of the process as described in this paper is a method to extract the water-soluble collagen. Water-soluble collagen was extracted from commercial collagen gel by mixing distilled water with the collagen gel, centrifugation, decanting, freezing and vacuum drying the supernate. Various ratios of commercial collagen gel to water ranging from 10% to 90% commercial collagen gel to water were examined based upon the extraction and performance of gravimetric analyses on the water-soluble collagen. The commercial collagen gel to water ratio had an effect on the mass fraction of extracted water-soluble collagen. Greater amounts of water-soluble collagen could be extracted by using lesser amounts of commercial collagen gel. The water-soluble collagen matrices had a mesh-like appearance similar to cotton, except that they could be flattened easily and could not retain their original shape. The water-soluble collagen matrices were formed into a chaotic, non-uniform manner caused by the re-constituting of fibers during the freezing and vacuum drying process. Note de contenu : - INTRODUCTION : Introduction to collagen - Water-soluble collagen
- EXPERIMENTAL : Experimental overview - Materials - Centrifugation study - Extraction process
- RESULTS AND DISCUSSION : Collagen composition of commercial collagen gel - Mass fraction of water-soluble collagen matrices - Microscopy of commercial collagen gel - Microscopy of water-soluble collagen matrix - SEM - waterxoluble collagen matrix
- CONCLUSIONS : Collagen composition of commercial collagen gel - Mass fraction of water-soluble collagen matrices - Microscopy of commercial collagen gel - Microscopy of water-soluble collagen matrices - SEM - water-soluble collagen matricesEn ligne : https://drive.google.com/file/d/1FwN0_eWMG-lD3IVo86Y7ubbXTn2Wvcz4/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15644
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Code-barres Cote Support Localisation Section Disponibilité 14063 - Périodique Bibliothèque principale Documentaires Disponible Preparation, characterization and application of silica metal oxide nanoparticles for leather coating / Sivaraj Sudhahar in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVII, N° 7 (07/2012)
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Titre : Preparation, characterization and application of silica metal oxide nanoparticles for leather coating Type de document : texte imprimé Auteurs : Sivaraj Sudhahar, Auteur ; Chandrasekaran Sivaraj, Auteur ; Sanjeev Gupta, Auteur Année de publication : 2012 Article en page(s) : p. 249-255 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation
Cuirs et peaux -- Finition
Dioxyde de silicium
Nanoparticules -- Synthèse
SiliceLa silice est la forme naturelle du dioxyde de silicium (SiO2) qui entre dans la composition de nombreux minéraux.
La silice existe à l'état libre sous différentes formes cristallines ou amorphes et à l'état combiné dans les silicates, les groupes SiO2 étant alors liés à d'autres atomes (Al : Aluminium, Fe : Fer, Mg : Magnésium, Ca : Calcium, Na : Sodium, K : Potassium...).
Les silicates sont les constituants principaux du manteau et de l'écorce terrestre. La silice libre est également très abondante dans la nature, sous forme de quartz, de calcédoine et de terre de diatomée. La silice représente 60,6 % de la masse de la croûte terrestre continentale.
Sol-gel, ProcédéIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : Synthesis of silica sol-gel nanoparticles was carried out by the Stober’s process and the resulting products were used in leather finishing mixtures as a coating ingredient. The physical and chemical properties of the synthesized sol-gel nanoparticles were characterized by TEM, FE-SEM, EDAX, FT-IR, TGA and XRD. The surface morphology of the nanoparticle coated leathers were evaluated by AFM. The silica sol-gel nanoparticles-coated leather exhibited improved water spotting resistance, water vapor permeability, and increased adhesion values. Therefore, a conventional system of leather finishing has been upgraded by using silica sol-gel nanoparticles, especially in the base coat application. Note de contenu : - INTRODUCTION : Materials - Synthesis of silica sol-gel nanoparticles - Preparation of conventional base coat finish formulation, incorporating silica sol-gel nanoparticles, for shoe upper leather - Top coat formulation for silica sol-gel nanoparticles applied leather
- RESULTS AND DISCUSSION : Structural and morphological characterization of silica sol-gel nanoparticles. Field emission scanning electron microscope imaging and energy dispersive analysis - Edax peaks of nano SiO2, powder - Elemental composition analysis - Determination of applied physical properties for silica sol-gel nanoparticles coated leather - Wet and dry rub analysis - Measurement of lastometer - Water spotting resistance - Measurement of water vapour permeability - Measurement of finish adhesion - Subjective evaluation result for silica sol-gel nanoparticles coated leatherEn ligne : https://drive.google.com/file/d/1yubC3ga22nLwuxyQqMDtKU-C-dvukK0h/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15645
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Code-barres Cote Support Localisation Section Disponibilité 14063 - Périodique Bibliothèque principale Documentaires Disponible
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14063 | - | Périodique | Bibliothèque principale | Documentaires | Disponible |