Preparation and characterisation of synthetic tannins based on phenol-dimethylolurea resin / K. Venkataboopathy in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 85, N° 5 (09-10/2001)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 85, N° 5 (09-10/2001) . - p. 175-178 Titre : Preparation and characterisation of synthetic tannins based on phenol-dimethylolurea resin Type de document : texte imprimé Auteurs : K. Venkataboopathy, Auteur ; R. Prabhu, Auteur ; Suman Meenakshi, Auteur ; V. S. Sundara Rao, Auteur Année de publication : 2001 Article en page(s) : p. 175-178 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse spectrale Caractérisation Chromatographie sur couches minces Cuir Evaluation Phénol-diméthylolurée Photostabilité Syntans Syntans -- Synthèse Tanins -- analyse Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Phenolic syntans possessing methylene linkages between phenolic nuclei are susceptible to auto-oxidation producing coloured quinonoid compounds. In this respect, syntans having bridging groups like dimethylcarbamide. sulphomethyl, sulphone. sulphonamide and propylene are known to exhibit better resistance to auto-oxidation. In the present investigation, studies have been carried out to synthesise and characterise a syntan in which phenolic nuclei are linked together by a dimethyl carbamide group. Phenol was condensed with dimethylolurea and the resulting resin was subsequently sulphonated with concentrated sulphuric acid. Both phenol-dimethylolurea resin and its sulphonated product were characterised by chromatographic and spectral methods. The syntan was prepared by mutual neutralization of sulphonated and sulphomethylated phenol dimethylolurea resin to a desired pH. The syntan was subjected to chemical analysis and assessed for light fastness characteristics. Note de contenu : - EXPERIMENTAL PROCEDURE : Preparation of phenol-dimethylolurea resin - Purification of resin - Determination of molecular weight - Sulphonation of the resin - Sulphométhylation of the resin - Determination of unsulphonated resin - Determination of unreacted sulphuric acid content in the sulphonated resin - PREPARATION OF SYNTANS : Preparation of syntan I - Preparation of syntan II - Preparation of syntan III - Chromatographic analysis - Spectroscopic analysis - Measurement of light fastness of leathers - Analysis of syntan - RESULTS AND DISCUSSION : Characterisation of phenol-dimethylolurea resin - Characterisation of sulphonated phenol-dimethlolurea resin - Characterisation of the syntan - Light fastness studies - - Table 1 : Thin layer chromatographic analysis of phenol-dimethlolurea resin - Table 2 : Analysis of synthetic tannin I - Table 3 : Light fastness assessment of leathers by Grey Scale Method En ligne : https://drive.google.com/file/d/1o8MN2j552DWUvfnmnBh-3-4RzazpVFKv/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40233 [article]

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