| Titre : |
A deeper exploration of the relation between sulfonation degree and retanning performance of aromatic syntans |
| Type de document : |
texte imprimé |
| Auteurs : |
Qingyong Sun, Auteur ; Yunhang Zeng, Auteur ; Ya-Nan Wang, Auteur ; Yue Yu, Auteur ; Bi Shi, Auteur |
| Année de publication : |
2021 |
| Article en page(s) : |
10 p. |
| Note générale : |
Bibliogr. |
| Langues : |
Anglais (eng) |
| Catégories : |
Composés aromatiques
Dynamique moléculaire
Pénétration (physique)
Précipitation (chimie)
Retannage
Simulation, Méthode de
Sulfonation
Syntans
Tannage synthétique
|
| Index. décimale : |
675.2 Préparation du cuir naturel. Tannage |
| Résumé : |
It is well-known that the sulfonation degree (DS) of aromatic syntan is an important factor affecting its retanning performances. But the quantitative relation between DS and syntan property and the influencing mechanism of DS on syntan property are not clarified. In this work, five phenolic formaldehyde syntans (PFSs) with the same polymerization degree but varying DS were prepared to investigate the effect of DS on the properties of syntan and crust leather. It was found that the absolute value of zeta potential and the particle size of PFS decreased with increasing DS in aqueous solution. Molecular dynamic simulation results proved that the DS of PFS was a major contributor to electrostatic interaction and hydrogen bonding in the PFS–water system and greatly affected the aggregation and dispersion of PFS in aqueous solution. The PFS with a low DS was prone to aggregate to large particles in aqueous solution because of low intermolecular electrostatic repulsion and less hydrogen bonds and therefore can be used to increase the thickness and tightness of leather. The PFS with a high DS presented a small particle size with more anionic groups in aqueous solution, thereby sharply decreasing the positive charge of leather surface and facilitating the penetration of the post-tanning agents into the leather. These results might be scientifically valid for rational molecular design of syntans and more productive use of syntans in leather making. |
| Note de contenu : |
- MATERIALS AND METHODS : Materials - Preparation of PFSs with different DSs - Determination of DS of PFS - Determination of zeta potential and particle size of PFS - MD simulation - Retanning and fatliquoring - Determination of zeta potential and pIs of retanned leather - Analysis of PFS penetration in leather - Determination of uptake rate of PFS by leather - Determination of thickness increase rate of leather - Determination of leather softness
- RESULTS AND DISCUSSION : Effect of DS on zeta potential and particle size of PFS - Effect of DS of PFS on pI of retanned leather - Effect of DS on penetration of PFS in retanned leather - Effect of DS on uptake of PFS by leather - Effect of DS of PFS on thickness and softness of crust leather
- Table 1 : Simulation details
- Table 2 : Retanning process
- Table 3 : Retanning and fatliqouring processes |
| DOI : |
https://doi.org/10.1186/s42825-021-00073-0 |
| En ligne : |
https://link.springer.com/content/pdf/10.1186/s42825-021-00073-0.pdf |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37556 |
in JOURNAL OF LEATHER SCIENCE AND ENGINEERING > Vol. 3 (Année 2021) . - 10 p.
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A deeper exploration of the relation between sulfonation degree and retanning performance of aromatic syntans in JOURNAL OF LEATHER SCIENCE AND ENGINEERING, Vol. 3 (Année 2021)
