Microemulsion copolymers for retanning applications on leathers / G. V. Ramana in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIII, N° 4 (04/2008)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CIII, N° 4 (04/2008) . - p. 144 - 150 Titre : Microemulsion copolymers for retanning applications on leathers Type de document : texte imprimé Auteurs : G. V. Ramana, Auteur ; R. W. Sugumar, Auteur ; D. Premkumar, Auteur ; P. Saravanan, Auteur Année de publication : 2008 Article en page(s) : p. 144 - 150 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : The microemulsion polymerization method is used to synthesize tercopolymers of styrene, methyl methacrylate and methacrylic acid with finer particle dispersions. Four compositions of the monomers mixture are used in these syntheses. The copolymeriztion reactions are carried out at 70°C with potassium persulphate (KPS) as the initiator. Sodium lauryl sulphate (SLS) and n-heptanol (HA) are being used as the surfactant and cosurfactant combinations, respectively, in these reaction media.These experimental products are employed in retanning wet blue goat skins along with the fatliquoring agent, Balmol SXE. The offer of the experimental products are varied in the retanning experiments and the effects of these products on retanned goat skins are observed by measuring tensile strength, tearing strength and bursting strength. The copolymer products II and III containing 5 and 7.5 weight percents of methacrylic acid as comonomer units , respectively, in the copolymers show considerable improvement in these properties. Product I containing no methacrylic acid groups in the copolymer shows improvement in tensile strength and fall in other properties. Product IV containing 10 (%wt) of methacrylic acid groups in the copolymer does not show considerable improvement in these physical properties, the tensile strength decreases with the offer of the product, no uniform variation of tear strength with the offer level and the grain bursting strength increases with the offer of the product. Scanning electron micrographs (SEM) are obtained for the leathers retanned with product I and these SEM analyses reveal good filling of the product I in the leather matrix. En ligne : https://drive.google.com/file/d/1OnFzPygFxGA9SGckE9oqkCa9gAHrVPlL/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=2569 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
010013	-	Périodique	Bibliothèque principale	Documentaires	Disponible

Microemulsion solutions of acrylic copolymers for retanning applications on chrome tanned goat skins / G. Mallikajun in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCVII, N° 6 (06/2002)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. XCVII, N° 6 (06/2002) . - p. 215-224 Titre : Microemulsion solutions of acrylic copolymers for retanning applications on chrome tanned goat skins Type de document : texte imprimé Auteurs : G. Mallikajun, Auteur ; P. Saravanan, Auteur ; G. V. Ramana, Auteur Année de publication : 2002 Article en page(s) : p. 215-224 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : The tercopolymer microemulsion (M.E.) solutions of methyl methacrylate (MMA), n-butyl acrylate (BA) and methacrylic acid (MAA) are prepared with four different compositions, by employing sodium lauryl sulphate (SLS) and n-pentanol (PA) as surfactant and co-surfactant, respectively, and by using potassium persulphate (KPS) as free radical initiator at a temperature of 70°C. The experimental products are employed in retanning chrome tanned goatskins along with the fatliquoring agent, Vernaminol liquor ASN. The offer of the experimental products are varried in the retanning experiments and the effects of these products on retanned goat skins are observed by measuring tensile strength, tearing strength and bursting strength. The experimental products show marked improvement in these properties. The scanning electron microscopic (SEM) studies are carried out on the retanned leathers retanned by application of microemulsion copolymer solutions prepared with 10 and 15 % of MAA, respectively, in the initial feeds of the microemulsion copolymerization experiments. The SEM analysis shows good filling and retanning effect with the experimental product containing the maximum MAA units in the copolymer under present study. The differential scanning calorimetric (DSC) studies of the retanned leathers retanned by employing the experimental products prepared with 10 and 15 percents of MAA units in the initial feeds of the microemulsion copolymerizations show the endothermic processes, respectively, at 105 and 118°C, which indicates higher shrinkage temperature by the application of the experimental product containing more MAA units (15%) in the copolymer and good retanning ability of the product. En ligne : https://drive.google.com/file/d/1jdLAWCGVLQQw90zMGCvZPJvfq-PVPi5h/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4290 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
001575	-	Périodique	Bibliothèque principale	Documentaires	Disponible

---

1 (1 - 2 / 2)