Preparation of cationic wheat starch by twin‐screw reactive extrusion | Zendy

Tara Ahmed | Zendy; Berzin Françoise | Zendy; Tighzert Lan | Zendy; Vergnes Bruno | Zendy

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Preparation of cationic wheat starch by twin‐screw reactive extrusion

Author(s) -

Tara Ahmed,

Berzin Françoise,

Tighzert Lan,

Vergnes Bruno

Publication year - 2004

Publication title -

journal of applied polymer science

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.575

H-Index - 166

eISSN - 1097-4628

pISSN - 0021-8995

DOI - 10.1002/app.20449

Subject(s) - cationic polymerization , extrusion , starch , reagent , reactive extrusion , materials science , aqueous solution , plasticizer , sodium hydroxide , plastics extrusion , polymer chemistry , chemical engineering , chemistry , organic chemistry , composite material , engineering

Cationic starches were prepared in a corotating twin‐screw extruder by using wheat starch and two different reagents: 2.3‐epoxypropyltrimethylammonium chloride (Quab 151®) and 3‐chloro 2‐hydroxypropyltrimethylammonium (Quab 188®) 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®) is more efficient in all processing conditions. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 93: 201–208, 2004

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