The hydroxypropylation of starch in a self‐wiping twin screw extruder | Zendy

de Graaf Robbert A. | Zendy; Janssen Leon P. B. M. | Zendy

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The hydroxypropylation of starch in a self‐wiping twin screw extruder

Author(s) -

de Graaf Robbert A.,

Janssen Leon P. B. M.

Publication year - 2003

Publication title -

advances in polymer technology

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.523

H-Index - 44

eISSN - 1098-2329

pISSN - 0730-6679

DOI - 10.1002/adv.10034

Subject(s) - plastics extrusion , starch , materials science , viscosity , modified starch , chemical engineering , polymer chemistry , reactive extrusion , polymer , polymer science , organic chemistry , composite material , chemistry , engineering

Potato starch was chemically modified in an APV self‐wiping twin screw extruder to produce hydroxypropylated starch. The product obtained had a molar degree of substitution (MS) between 0.06 and 0.26. The selectivity of the hydroxypropylation reaction varied between 50 and 95%, yields varied between 15 and 95%, and conversions between 30 and 91%. Using viscosity data of native and hydroxypropylated starch, together with extruder parameters like temperatures, residence time distribution, and shear rates, a model was set up to predict the MS values, conversions, and selectivities. With this model, interactions between temperature, reaction, and viscosity can be understood and predicted. © 2003 Wiley Periodicals, Inc. Adv Polym Techn 22: 56–68, 2003; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/adv.10034

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