A comparison of low temperature softness of leather lubricated with various types of fatliquor / Zhengjun Li in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 98, N° 4 (07-08/2014)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 98, N° 4 (07-08/2014) . - p. 167-171 Titre : A comparison of low temperature softness of leather lubricated with various types of fatliquor Type de document : texte imprimé Auteurs : Zhengjun Li, Auteur ; Fan Wuhou, Auteur ; Yang Qinhuan, Auteur ; Tian Ye, Auteur Année de publication : 2014 Article en page(s) : p. 167-171 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse mécanique dynamique Cuir Douceur (toucher) Huile de colza Huiles et graisses Lécithine La phosphatidylcholine est plus connue sous le nom lécithine. Au sens le plus strict, la lécithine désigne uniquement les phosphatidylcholines c'est-à-dire un lipide formé à partir d'une choline, d'un phosphate, d'un glycérol et de deux acides gras (figure). Dans ce contexte, il serait plus juste de parler des lécithines, car il ne s'agit pas d'une seule molécule mais d'un groupe dont la composition en acide gras varie d'une molécule à l'autre. Ainsi, les lécithines vont adopter diverses couleurs selon leur composition : du jaune, pour la lécithine végétale, au brun, pour la lécithine de poisson. Le terme de lécithine est aussi utilisé par extension pour désigner l'ensemble des phospholipides extraits du vivant (par exemple le soja), dans la mesure où ils sont majoritairement constitués de phosphatidylcholine. Polyéther de silicone Produits de nourriture du cuir Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Fatliquors are some of the most effective chemicals to impart softness and flexibility to leather, and low temperature softness of leather is very important for the application of leather in a low temperature environment. The main objective of the present work is to compare low temperature softness of leather lubricated with various types of fatliquors. In this work, a softness tester and dynamic mechanical analysis were used to investigate the softness variation of leather which was lubricated with different types of fatliquors, such as polyether silicone, sulphonated rapeseed oil, modified soybean lecithin and so on, at temperatures within the range of -15°C to 25°C. The results indicate that the smallest variation in softness ratio is shown by polyether oil lubricated leather and imply that silicone oil is superior to sulphonated rapeseed oil and modified lecithin for manufacturing a leather with excellent low temperature softness. Therefore there is great value in effectively utilizing silicone oil as a main component in fatliquoring agents to meet the new growing demand for low temperature softness of leather. Note de contenu : - EXPERIMENTAL PROCEDURES : Materials and processing procedure - Dynamic mechanical analysis (DMA) - RESULTS AND DISCUSSIONS : Softness - Dynamic mechanical analysis (DMA) En ligne : https://drive.google.com/file/d/159GSc85LS_o4V4iyQBkpDLNNzmJiJWuw/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=21817 [article]

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A review on room-temperature self-healing polyurethane : synthesis, self-healing mechanism and application / Yupeng Li in JOURNAL OF LEATHER SCIENCE AND ENGINEERING, Vol. 4 (Année 2022)  

[article]  inJOURNAL OF LEATHER SCIENCE AND ENGINEERING > Vol. 4 (Année 2022) . - 22 p. Titre : A review on room-temperature self-healing polyurethane : synthesis, self-healing mechanism and application Type de document : texte imprimé Auteurs : Yupeng Li, Auteur ; Yong Jin, Auteur ; Fan Wuhou, Auteur ; Rong Zhou, Auteur Année de publication : 2022 Article en page(s) : 22 p. Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Polymères -- Synthèse Polymères autoréparants Polyuréthanes Index. décimale : 668.9 Polymères Résumé : Polyurethanes have been widely used in many fields due to their remarkable features such as excellent mechanical strength, good abrasion resistance, toughness, low temperature flexibility, etc. In recent years, room-temperature self-healing polyurethanes have been attracting broad and growing interest because under mild conditions, room-temperature self-healing polyurethanes can repair damages, thereby extending their lifetimes and reducing maintenance costs. In this paper, the recent advances of room-temperature self-healing polyurethanes based on dynamic covalent bonds, noncovalent bonds and combined dual or triple dynamic bonds are reviewed, focusing on their synthesis methods and self-healing mechanisms, and their mechanical properties, healing efficiency and healing time are also described in detial. In addition, the latest applications of room-temperature self-healing polyurethanes in the fields of leather coatings, photoluminescence materials, flexible electronics and biomaterials are summarized. Finally, the current challenges and future development directions of the room-temprature self-healing polyurethanes are highlighted. Overall, this review is expected to provide a valuable reference for the prosperous development of room-temperature self-healing polyurethanes. Note de contenu : - DYNAMIC COVALENT BONDS : Disulfide, diselenide, and detelluride bonds - Imine bonds - Boroxine bonds - Alkoxyamine bonds - DYNAMIC NONCOVALENT BONDS : Multiple hydrogen bonds - Metal–ligand coordination bonds - Ionic bonds - COMBINED DUAL OR TRIPLE DYNAMIC BOND SYSTEMS - CURRENT APPLICATIONS OF ROOM-TEMPERATURE SELF-HEALING POLYURETHANES : Leather coatings - Photoluminescence materials - Flexible electronics - Biomaterials - Table 1 : Types and self-healing mechanisms of main dynamic covalent bonds for room temperature self-healing polyurethanes - Table 2 : Types and self-healing mechanisms of main dynamic noncovalent bonds for room-temperature self-healing polyurethanes - Table 3 : Summary of the healing mechanisms, mechanical properties, healing time and healing efficiency of room-temperature self-healing polyurethanes DOI : https://doi.org/10.1186/s42825-022-00097-0 En ligne : https://link.springer.com/content/pdf/10.1186/s428 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38218 [article]

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