| Titre : |
Thermal stability and degradation kinetics of vegetable-tanned collagen fiber with in-situ precipitated calcium cabonate |
| Type de document : |
texte imprimé |
| Auteurs : |
Jie Liu, Auteur ; Eleanor M. Brown, Auteur ; Joseph Uknalis, Auteur ; Cheng-Kung Liu, Auteur ; Lan Luo, Auteur ; Ke-Yong Tang, Auteur |
| Année de publication : |
2018 |
| Article en page(s) : |
p. 358-370 |
| Note générale : |
Bibliogr. |
| Langues : |
Américain (ame) |
| Catégories : |
Carbonate de calcium Le carbonate de calcium (CaCO3) est composé d'un ion carbonate (CO32-) et d'un ion calcium (Ca2+), sa masse molaire est de 100,1 g/mole.
C'est le composant principal du calcaire et de la craie, mais également du marbre. C'est aussi le principal constituant des coquilles d'animaux marins, du corail et des escargots.
Cinétique chimique
Collagène -- Détérioration
Microscopie électronique à balayage
Stabilité thermique
Tannage végétal
Thermogravimétrie
|
| Index. décimale : |
675.2 Préparation du cuir naturel. Tannage |
| Résumé : |
The effects of in-situ precipitated calcium carbonate (CaCO3) on the thermal stability and decomposition kinetics of vegetable-tanned collagen fiber (VCF) are evaluated by thermogravimetry. The kinetic and mechanism analysis of the decomposition stage use an integrated procedure involving model-free methods and master-plots method. Various methods are employed to calculate the activation energy of the fibers. It is shown that VCF/CaCO3 exhibits better thermal stability than VCF in the range 22-350°C. However, thermogravimetric results also show that the presence of CaCO3 accelerates the decomposition process at higher temperatures. When the conversion values are below 0.4, the most probable decomposition mechanism for VCF and VCF/CaCO3 is random nucleation and nuclei growth (Avrami, equation A2). Above 0.4, the decomposition mechanisms of VCF and VCF/CaCO3 are most probably described by third (F3) and second (F2) order models, respectively. Morphological/elemental analysis showed calcium dispersed evenly over the VCF/CaCO3. |
| Note de contenu : |
- THEORETICAL BACKGROUND : Kinetic methods - Model-free methods - Master-plots method
- EXPERIMENTAL : Materials - Preparation of VCF/CaCO3 - Scanning electron microscopy (SEM) analysis - Thermogravimetric analysis (TGA)
- RESULTS AND DISCUSSION : Morphology and microstructure - Overall thermal degradation behavior - Isoconversional method for estimating activation energy - Master-plots method for determining decomposition mechanism |
| En ligne : |
https://drive.google.com/file/d/1-srI9OHOVfa6XF40bvCLK0zUZEJy9ZPz/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31202 |
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXIII, N° 11 (11/2018) . - p. 358-370
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