Synthesis, characterisation and application of novel valonia tannin based waterborne polyurethane with natural colour / Yang Liu in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 103, N° 3 (05-06/2019)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 103, N° 3 (05-06/2019) . - p. 135-141 Titre : Synthesis, characterisation and application of novel valonia tannin based waterborne polyurethane with natural colour Type de document : texte imprimé Auteurs : Yang Liu, Auteur ; Haihang Luo, Auteur ; Benyapathitiwong Ruj, Auteur ; Tao You, Auteur ; Youjie He, Auteur Année de publication : 2019 Article en page(s) : p. 135-141 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Algues marines Caractérisation Cuirs et peaux -- Finition Essais dynamiques Humidité -- Absorption:Eau -- Absorption Pliage (mécanique) Polymères -- Analyse Polymères -- Synthèse Polymères en émulsion Polyuréthanes Résistance chimique Solidité de la couleur Taille des particules Tanins végétaux Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : A novel natural coloured waterborne polyurethane (PU) based on valonia tannin was successfully synthesised and characterised. A structural study of the polymer by Fourier Transform Infra Red (FTIR) spectroscopy confirmed the incorporation of valonia tannin into the backbone of the PU. The dispersion of valonia tannin and homogeneity of surface of the PU samples were confirmed by scanning electron microscopic (SEM) analysis. Chromaticity and colour difference further verified the colour depth and uniformity of the cured films. Thermogravimetric analysis (TGA) results indicated that the synthesised PU samples exhibited an improved thermal decomposition temperature. Particle size analysis, mechanical testing and water absorption of the synthesised PU samples further showed the effect of the cross-linked structure in the molecular chain segment. Moreover, the colour fastness and folding [flexing] resistance of the leather coating finished with synthesised PU was better than that of valonia tannin blending. Note de contenu : - MATERIALS AND METHODS : Materials - Synthesis of polyurethane - Preparation of polyurethane films and finished leather samples - Measurements - RESULTS AND DISCUSSION : FTIR spectral studies - Scanning electron microscope (SEM) analysis - Chromaticity and colour difference analysis - Particle size analysis - Thermal stability - Mechanical testing - Water and solvent resistance - Property analysis of leather coating - Table 1 : Chromaticity size analysis - Table 2 : The average particle size of the PU samples - Table 3 : Water and solvent resistance of PU samples - Table 4 : Properties of finished leather samples En ligne : https://drive.google.com/file/d/1vPbiP9usPOvkUanzxPqYIzf_EFe9o9MN/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32670 [article]

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