Accueil
Résultat de la recherche
2 résultat(s) recherche sur le tag 'cleavable'
Ajouter le résultat dans votre panier Affiner la recherche Générer le flux rss de la recherche
Partager le résultat de cette recherche
Development of cleavable surfactants / D. Shukla in TENSIDE, SURFACTANTS, DETERGENTS, Vol. 47, N° 1/2010 (01-02/2010)
[article]
Titre : Development of cleavable surfactants Type de document : texte imprimé Auteurs : D. Shukla, Auteur ; V. K. Tyagi, Auteur Année de publication : 2010 Article en page(s) : p. 7-12 Note générale : Bibliogr. Langues : Anglais (eng) Tags : Cleavable surfactants Biodegradation Chemodegradable Hydrolyzable Gemini Diels-Alder reaction Index. décimale : 668.1 Agents tensioactifs : savons, détergents Résumé : Cleavable surfactants are of great interest for numerous reasons. These are amphiphiles in which a weak linkage has been deliberately inserted, normally, but not always, between the hydrophobic tail and the polar head group. Surfactant may degrade by chemical means, e.g., induced by acid, alkali, ultraviolet (UV) light, heat, or ozone. Acid- and alkali-labile surfactants have also attracted the attention in recent years. The main purpose for development of novel cleavable surfactants is to improve the biodegradation characteristics and the rate of biodegradation has consequently been studied for several of the surfactants. Alkali labile linkages that have been used for the purpose include normal ester bonds, betaine esters, and carbonates. This review deals the development of monomeric and gemini type cleavable surfactants. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=8063
in TENSIDE, SURFACTANTS, DETERGENTS > Vol. 47, N° 1/2010 (01-02/2010) . - p. 7-12[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 011905 - Périodique Bibliothèque principale Documentaires Disponible A new class of labile surfactants that break down to non-surface active products upon heating or after a pre-set time, without the need for a pH change / M. Andersson in TENSIDE, SURFACTANTS, DETERGENTS, Vol. 44, N° 6/2007 (12/2007)
[article]
Titre : A new class of labile surfactants that break down to non-surface active products upon heating or after a pre-set time, without the need for a pH change Type de document : texte imprimé Auteurs : M. Andersson, Auteur ; A. Hillerström, Auteur ; A. Svensk, Auteur ; S. R. Younesi, Auteur ; E. Sjöström, Auteur ; I. Blute, Auteur ; Mikael Kjellin, Auteur ; J. Kizilng, Auteur ; B. Kronberg, Auteur ; J. Oldgren, Auteur ; A. Hansson, Auteur ; S. Sjöstrand, Auteur Année de publication : 2008 Article en page(s) : p. 366-372 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Surfactants Tags : Labile surfactants Cleavable Car washing degreasing Alkyl ketene dimer Beta-keto Index. décimale : 668.1 Agents tensioactifs : savons, détergents Résumé : A new class of labile surfactants that break down at a controllable rate without the need for a change in pH will be presented. The invention has been patented by YKI Institute for Surface Chemistry, and is based on use of béta-keto acids or their salts as surface-active compounds. These surfactants spontaneously break down through decarboxylation, to form an oil-like ketone and CO2/HCO3–/CO32– depending on pH. The rate of breakdown can be controlled within a wide range by temperature or by certain additives, but, unlike most cleavable surfactants, a change in pH is not needed. Furthermore the surfactants can be conveniently activated from a stabile precursor just before use, and one (of many possible) precursors of this kind is already available on the industrial scale in the form of a well-known chemical that is FDA-approved in other, non-surfactant, applications. The compound in question, alkyl ketene dimer (AKD), is produced in large scale by a number of large chemical producers today, and used for hydrophobization of paper. The present article gives an overview of the surfactant chemistry, with focus on recent studies of the kinetics of activation of the surfactant precursor and breakdown kinetics of the labile surfactant at different conditions. Furthermore, possible industrial applications of the surfactant will be discussed, with one example taken from a recent feasibility Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3199
in TENSIDE, SURFACTANTS, DETERGENTS > Vol. 44, N° 6/2007 (12/2007) . - p. 366-372[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 009017 - Périodique Bibliothèque principale Documentaires Disponible