Superhydrophobic modification of collagen fiber : A potential substitute for tanning / Shuangfeng Xu in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVII, N° 10 (10/2022)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXVII, N° 10 (10/2022) . - p. 422-431 Titre : Superhydrophobic modification of collagen fiber : A potential substitute for tanning Type de document : texte imprimé Auteurs : Shuangfeng Xu, Auteur ; Ya-Nan Wang, Auteur ; Bi Shi, Auteur Année de publication : 2022 Article en page(s) : p. 422-431 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Collagène Cuir Déshydratation Hydrophobie Innovations Procédé de fabrication sans tannage Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Tanning is considered to be the crosslinking reaction between collagen fibers and tanning agents, and a majority of tanning reactions result in suppressed water absorption and enhanced hydrophobicity of leather. However, extensive use of tanning agents may bring a burden to the environment. Herein, to facilitate a sustainable leather manufacturing industry, we propose a revolutionary strategy of “tanning” without tanning agents. Based on this strategy, superhydrophobic collagen fibers (FAS-CFs) were fabricated through dehydration, followed by superhydrophobic modification. Dehydration aimed to eliminate the “sticky” effect of water on collagen fiber to obtain a dispersed hierarchical structure. Superhydrophobic modification not only dispersed and stabilized the fiber structures, but also protected the fiber dispersity from water immersion. Compared with chrome-tanned collagen fibers (Cr-CFs) and glutaraldehyde-tanned collagen fibers (G-CFs), FAS-CFs showed higher hydrophobicity, lower water absorption, and superior mechanical properties. Meanwhile, FAS-CFs exhibited a high thermal denaturation temperature of 92.5°C and retained their original shape after being heated to 100°C. Therefore, our proposed strategy is expected to be a potential substitute for conventional tanning and might contribute to cleaner and sustainable leather manufacturing. Note de contenu : - EXPERIMENTAL : Materials - Fabrication of collagen fibers (CFs) - Fabrication of superhydrophic collagen fibers (FAS-CFs) - Fabrication of Cr (III) cross-linked collagen fibers (Cr-CFs) - Fabrication of glutaraldehyde cross-linked collagen fibers (G-CFs) - Characterization of CFs and FAS-CFs - Measurements of surface wettability of CFs, G-CFs, Cr-CFs, and FAS-CFs - Measurements of hydrophobic durability of FAS-CFs - Measurements of water absorption of CFs, G-CFs, Cr-CFs, and FAS-CFs - Measurements of the thermal stability - Measurements of the mechanical properties - RESULTS AND DISCUSSION : "Tanning agent-free strategy" for leather manufacturing - Characterization of CFs and FAS-CFs - Effect of fluorine content on hydrophobicity of FAS-CFs - Hydrophobic durability of FAS-CFs - Hydrophobicity of CFs, G-CFs - Cr-CFs, and FAS-CFs - Thermal stability and mechanical properties of CFs, G-CFs, Cf-CFs, and FAS-CFs DOI : https://doi.org/10.34314/jalca.v117i10.6182 En ligne : https://drive.google.com/file/d/1QXwPlu1ybF1PRLjOgUWAIcENm-vwpRQ-/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38228 [article]

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The improvement of dispersity, thermal stability and mechanical properties of collagen fibers by silane modification : an exploration for developing new leather making technology / Shuangfeng Xu in JOURNAL OF LEATHER SCIENCE AND ENGINEERING, Vol. 4 (Année 2022)  

[article]  inJOURNAL OF LEATHER SCIENCE AND ENGINEERING > Vol. 4 (Année 2022) . - 11 p. Titre : The improvement of dispersity, thermal stability and mechanical properties of collagen fibers by silane modification : an exploration for developing new leather making technology Type de document : texte imprimé Auteurs : Shuangfeng Xu, Auteur ; Hanzhong Xiao, Auteur ; Bi Shi, Auteur Année de publication : 2022 Article en page(s) : 11 p. Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Caractérisation Collagène Cuirs et peaux Procédés de fabrication Réaction de couplage Silanes Stabilité thermique Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The effect of hydrophobic modification on the performances of collagen fibers (CFs) was investigated by using silane coupling agents with different alkyl chains as hydrophobic modifiers. It was found silane could be easily grafted onto CF surface through covalent bonds under 5% water content. This modification led to the transformation of surface wettability of CF from hydrophilic to hydrophobic. Interestingly, the change of surface wettability resulted in substantial improvement of the modified CF properties, presenting well dispersity of collagen fibers, higher thermal stability and enhanced mechanical properties in comparison with natural CF. The degree of improvement mainly depended on the length of alkyl chain in silane. Longer alkyl chain produced strong hydrophobicity and subsequently more superior performances of the modified CF. When the length of alkyl chain increased to 18 carbon atoms, the modified CF possessed durable superhydrophobicity even exposed to aqueous solutions of different pH, UV, and organic solvents, and had excellent thermal and mechanical properties like leather fibers. In general, this work clearly revealed that the properties of CF are closely and positively related to the hydrophobicity, which is suggestive in developing new leather making technology. Note de contenu : - Materials - Fabrication of dehydrated collagen fibers (CFs) - Fabrication of hydrophobic collagen fibers (TMSx-CF) - Characterization DOI : https://doi.org/10.1186/s42825-022-00100-8 En ligne : https://link.springer.com/content/pdf/10.1186/s42825-022-00100-8.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38220 [article]

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