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Effects of a clean subcritical degreasing system on wool fibers / Qiao Xia in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVI, N° 5 (05/2021)
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Titre : Effects of a clean subcritical degreasing system on wool fibers Type de document : texte imprimé Auteurs : Qiao Xia, Auteur ; Yinxuan Wang, Auteur ; Zongcai Zhang, Auteur ; Hong Dai, Auteur Année de publication : 2021 Article en page(s) : p. 162-167 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation
Dégraissage (nettoyage)
Laine brute
PentaneLe pentane est un alcane linéaire de formule C5H12.
Le terme pentane désigne aussi par extension abusive17 les trois isomères C5H12 : le n-pentane, le 2-méthylbutane ou isopentane et le 2,2-diméthylpropane ou néopentane. Ces diverses molécules comportent toutes cinq atomes de carbone.
Utilisations : Le pentane est un solvant couramment utilisé en chimie organique.
Propriétés chimiques : Le pentane brûle dans l'air selon la réaction : C5H12 + 8O2 —> 5CO2 + 6H2O (Wikipedia)
Stabilité thermique
ThermogravimétrieIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : It makes sense to use environmentally friendly methods of degreasing in fur-making process. In this study, subcritical n-pentane was used to degrease wool fibers. Thermogravimetric analysis (TGA) was used to observe and analyze the properties of the subcritical n-pentane degreased wool fibers. The results showed that the thermal stability of the fibers increased. Fourier Transform Infrared (FTIR) spectroscopy was used to analyze the structural changes of macromolecular chains in wool fibers. It was found that when the pressure was higher than 0.4 MPa, the wool fibers underwent a conformational change with the α-helix changing to β-folding. If the pressure was as high as 0.6 MPa, the disulfide bonds in the wool fibers scale layer appeared to break. X-ray powder diffraction experiment was used to study changes in wool fiber aggregation morphology. It was demonstrated that the crystalline zone of wool fibers changed and the fibers index grew, from 22.89% to 30.19%. Field emission scanning electron microscopy and ultra-depth of field microscopy was used to analyze changes in the surface morphology of wool fibers. The results suggested that after the treatment, the wool fibers were not damaged and the impurities on the wool surface were reduced. Note de contenu : - EXPERIMENTAL : Materials - Sample preparation - The experimental process
- CHARACTERIZATION TECHNIQUES : Degreasing rate - Change in thermal stability in wool - Structural changes in wool fibers macromolecular chains using Fourier Transform Infrared (FTIR) spectroscopy - Structural changes in the aggregation state of wool fibers ssing X-Ray powder diffraction - Morphological changes on the wool surface using Scanning Electron Microscopy and ultra-depth microscopy
- RESULTS AND DISCUSSION : Effect of degreasing - Effect of subcritical n-pentane treatment on thermal stability of wool fibers - Effect of subcritical n-Pentane treatment on macromolecular chain structure of wool fibers
- Table 1 : Infrared characteristic absorption band of wool fibers22
- Table 2 : Relative intensity of some characteristic peaks of wool fibers after subcritical n-pentane treatment at different pressureDOI : https://doi.org/10.34314/jalca.v116i5.4292 En ligne : https://drive.google.com/file/d/1OUz4ZlvKlN2y_DdhPCN1R7GO6Ej2Oyvu/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35759
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