Accéder directement au contenu Accéder directement à la navigation
Article dans une revue

Preparation of cationic wheat starch by twin-screw reactive extrusion

Abstract : Cationic starches were prepared in a corotating twin-screw extruder by using wheat starch and two different reagents: 2.3-epoxypropyltrimethylammonium chloride (Quab 151(R)) and 3-chloro 2-hydroxypropyltrimethylammonium (Quab 188(R)) in aqueous sodium hydroxide (NaOH). The different factors affecting this reaction were investigated. These factors include the extrusion conditions (feed rate, screw speed, barrel temperature), the reagent chemical structure, the starch plasticizer, and the molar ratio between Quab and NaOH. Degree of substitution (DS) and reaction efficiency (RE) were characterized, as well as starch transformation. High reaction efficiency (90%) can be reached for a low degree of substitution. It appears that the epoxy form of the reagent (Quab 151(R)) is more efficient in all processing conditions.
Type de document :
Article dans une revue
Liste complète des métadonnées
Contributeur : Magalie Prudon <>
Soumis le : mercredi 3 novembre 2010 - 09:45:31
Dernière modification le : jeudi 24 septembre 2020 - 17:22:54

Lien texte intégral



Ahmed Tara, Françoise Berzin, Lan Tighzert, Bruno Vergnes. Preparation of cationic wheat starch by twin-screw reactive extrusion. Journal of Applied Polymer Science, Wiley, 2004, 93 (1), p.201-208. ⟨10.1002/app.20449⟩. ⟨hal-00531544⟩



Consultations de la notice