Investigation of the gelatinization and extrusion processes of corn starch

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Abstract
The gelatinization and extrusion processes of corn starch were studied. Differential scanning calorimetry was used to determine the gelatinization temperature as a function of the water content. Plasticized corn starch was processed in single‐ and twin‐screw extruders to produce thermoplastic materials. The mechanical properties of the films obtained in the twin‐screw extruder with the addition of different quantities of water were evaluated. Dynamic mechanical analysis applied to thermoplastic starch samples obtained with 33% (w/w) total plasticizers showed two transitions, attributed to the presence of two phases in the starch–glycerol–water system. © 2002 John Wiley & Sons, Inc. Adv Polym Techn 21: 17–24, 2002; DOI 10.1002/adv.10007