The relationship between the structure of hyper-branched polymer and its effect on high exhaust chrome in reduced chrome tanning / Yao Qi in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXII, N° 5 (05/2017)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXII, N° 5 (05/2017) . - p. 153-161 Titre : The relationship between the structure of hyper-branched polymer and its effect on high exhaust chrome in reduced chrome tanning Type de document : texte imprimé Auteurs : Yao Qi, Auteur ; Chenying Li, Auteur ; Henghui Huang, Auteur ; Hualin Chen, Auteur ; Bailing Liu, Auteur Année de publication : 2017 Article en page(s) : p. 153-161 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Chrome trivalent -- Absorption Cuirs et peaux -- Analyse Groupement carboxyle Oligomères Poids moléculaires Polydispersité Polymères -- Synthèse Polymères ramifiés Tannage au chrome Température de retrait Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Hyper-branched polymer (HBP) has been widely used as pretanning, tanning auxiliary and retanning agent in chrome tanning industry. However the effect of the structure of HBP including the degree of branching (DB) and molecular weight (Mw), on chrome tanning has seldom been studied. In this study a series of carboxyl-terminated hyper-branched oligomer (HBP) with different DB and Mw have been prepared and characterized by GPC and 1H-NMR for determining their molecular weight and its distribution, as well the DB. The effect of DB and Mw on the chrome uptake and shrinkage temperature (Ts) of hide was investigated. Experimental results showed that the chrome uptake was affected by both DB and Mw of developed HBP. HBP that possesses high DB and the Mw closed to 2000 Da, has endowed the obtained leather with higher Ts and chrome uptake. Moreover, the leather tanned with 3% chrome and 1.5% HBP possesses similar properties to the traditional tanning process using 6-8% chrome. Therefore, the carboxyl-terminated HBP presents a potential application as a tanning auxiliary in reduced chrome tanning due to it’s improving the absorption of chrome. Note de contenu : - MATERIALS AND METHODS : Chemicals and materials - Synthesis of the carboxyl-terminated hyper-branched oligomer - Chrome tanning - INSTRUMENTS AND MEASUREMENTS : Gel permeation chromatography (GPC) - Differential scanning calorimetry (DSC) - FT-IR spectra - H NMR - The acid value - Shrinkage temperature - Chrome uptake - Charactereization of HBP-x - FTIR of the HBP-1 - HNMR of the HBP-1 - Estimation of the DB - Molecular weights and polydispersity - Chrome uptake - Effect of DB on the chrome uptake - Effect of Mw on the chrome uptake - Reduced tanning with HBP En ligne : https://drive.google.com/file/d/1E-yNeSRgfe2iItWez_p55B8SmbCRWwzG/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28551 [article]

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