Starch-based plastic foams from various starch sources
1996
Bhatnagar, S. | Hanna, M.A.
Corn, tapioca, wheat, rice, and potato starches were extruded with 30% polystyrene and 5% magnesium silicate or 1% polycarbonate or 0.5% azodicarbonamide in a single screw C. W. Brabender laboratory extruder at 140 degrees C barrel temperature, 140 rpm screw speed, and 16% starch moisture content on dry weight basis. The foams did not show presence of either free starch or polystyrene. The components were well grafted as was confirmed by X-ray diffraction patterns of extrudates and water solubility indexes. The expansion. unit density and water solubility index of the extrudates depended on source of starch and the type of additive. In general, tapioca and corn starches gave the best products with any of the additives.
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