Admicellar polymerization and mixing in a laboratory dyeing unit-A variant of rocking reactors / Srinivas Hanumansetty in Industrial & engineering chemistry research, Vol. 50 N° 10 (Mai 2011)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 50 N° 10 (Mai 2011) . - pp. 6418-6425 Titre : Admicellar polymerization and mixing in a laboratory dyeing unit-A variant of rocking reactors Type de document : texte imprimé Auteurs : Srinivas Hanumansetty, Auteur ; Pratik Kothary, Auteur ; Nantaya Yanumet, Auteur Année de publication : 2011 Article en page(s) : pp. 6418-6425 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Reactor Mixing Polymerization Résumé : Mass transfer in a laboratory dyeing machine, consisting of cylindrical canisters mounted on a carousel with a horizontal axis, has been examined to adapt the unit for modification of cotton by admicellar polymerization. Canisters located at the periphery of the carousel are canted relative to the axis of rotation so that fluid in the canister moves front-to-back and back-to-front over the course of one revolution in a fashion similar to a rocking reactor. Dissolution of benzoic acid in water at 30 °C has been used to determine mass transfer coefficients β in the dyeing system as a function of rotational rate and fill volume. Mixing in the dyeing system improved with canister fill fraction to an optimum of 0.9, while rotation rate had little effect over the available range. Findings for β as well as predictions for β obtained from estimates of specific mixing power are compared to values from the literature for a rocking reactor. The process of admicellar polymerization on cotton was subsequently examined in the laboratory dyeing machine. Cotton with a water repellent coating prepared in the unit was evaluated using various techniques. Conditions favorable to mass transfer in the model experiments were consistent with those providing optimal performance of the water-repellent coating applied by admicellar polymerization. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24158939 [article] Admicellar polymerization and mixing in a laboratory dyeing unit-A variant of rocking reactors [texte imprimé] / Srinivas Hanumansetty, Auteur ; Pratik Kothary, Auteur ; Nantaya Yanumet, Auteur . - 2011 . - pp. 6418-6425. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 10 (Mai 2011) . - pp. 6418-6425 Mots-clés : Reactor Mixing Polymerization Résumé : Mass transfer in a laboratory dyeing machine, consisting of cylindrical canisters mounted on a carousel with a horizontal axis, has been examined to adapt the unit for modification of cotton by admicellar polymerization. Canisters located at the periphery of the carousel are canted relative to the axis of rotation so that fluid in the canister moves front-to-back and back-to-front over the course of one revolution in a fashion similar to a rocking reactor. Dissolution of benzoic acid in water at 30 °C has been used to determine mass transfer coefficients β in the dyeing system as a function of rotational rate and fill volume. Mixing in the dyeing system improved with canister fill fraction to an optimum of 0.9, while rotation rate had little effect over the available range. Findings for β as well as predictions for β obtained from estimates of specific mixing power are compared to values from the literature for a rocking reactor. The process of admicellar polymerization on cotton was subsequently examined in the laboratory dyeing machine. Cotton with a water repellent coating prepared in the unit was evaluated using various techniques. Conditions favorable to mass transfer in the model experiments were consistent with those providing optimal performance of the water-repellent coating applied by admicellar polymerization. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24158939

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Preparation and comparison of hydrophobic cotton fabric obtained by direct fluorination and admicellar polymerization of fluoromonomers / Jayanta Maity in Industrial & engineering chemistry research, Vol. 49 N° 13 (Juillet 2010)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 49 N° 13 (Juillet 2010) . - pp. 6075–6079 Titre : Preparation and comparison of hydrophobic cotton fabric obtained by direct fluorination and admicellar polymerization of fluoromonomers Type de document : texte imprimé Auteurs : Jayanta Maity, Auteur ; Pratik Kothary, Auteur ; Edgar A. O’Rear, Auteur Année de publication : 2010 Article en page(s) : pp. 6075–6079 Note générale : industrial chemistry Langues : Anglais (eng) Mots-clés : cotton fabrics  fluorination  admicellar polymerization  spectroscopy  Fourier transform Résumé : Two different methods of surface modification of cotton fabrics are compared: direct fluorination using elemental fluorine and admicellar polymerization, which uses a surfactant and fluoromonomer system. Sample characterization includes infrared spectroscopy, analysis of mechanical properties, analysis of wetting times, contact angle measurements, scanning electron microscopy, elemental analysis, and atomic force microscopy analysis. Fourier transform infrared spectroscopy and elemental analysis showed the presence of fluorine moieties. For direct fluorinated cotton fabric, the static contact angle was found to be 117°, and for cotton fabric modified by admicellar polymerization, the contact angle was 125°. In all cases, the presence of a very thin fluorocarbon layer on the surface was confirmed, but differences in terms of the amount of fluorochemical formed and in surface structure were also found. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie100564y [article] Preparation and comparison of hydrophobic cotton fabric obtained by direct fluorination and admicellar polymerization of fluoromonomers [texte imprimé] / Jayanta Maity, Auteur ; Pratik Kothary, Auteur ; Edgar A. O’Rear, Auteur . - 2010 . - pp. 6075–6079. industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 13 (Juillet 2010) . - pp. 6075–6079 Mots-clés : cotton fabrics  fluorination  admicellar polymerization  spectroscopy  Fourier transform Résumé : Two different methods of surface modification of cotton fabrics are compared: direct fluorination using elemental fluorine and admicellar polymerization, which uses a surfactant and fluoromonomer system. Sample characterization includes infrared spectroscopy, analysis of mechanical properties, analysis of wetting times, contact angle measurements, scanning electron microscopy, elemental analysis, and atomic force microscopy analysis. Fourier transform infrared spectroscopy and elemental analysis showed the presence of fluorine moieties. For direct fluorinated cotton fabric, the static contact angle was found to be 117°, and for cotton fabric modified by admicellar polymerization, the contact angle was 125°. In all cases, the presence of a very thin fluorocarbon layer on the surface was confirmed, but differences in terms of the amount of fluorochemical formed and in surface structure were also found. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie100564y

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