Thesis - University Access Only
Master of Science (MS)
Department / School
High temperature short time extrusion processing was used to produce a corn flour polystyrene foamed plastic. The resiliency, bulk density and thermal conductivity was measured of the extrudates. The minimum bulk density and thermal conductivity measured was 0.069 g/cm 3 and 0.044 W/m C. The maximum resiliency measured was 89.1%. Three separate multiple regression models were developed to predict resiliency, bulk density and thermal conductivity as a function of extrudate formulation ingredients. The models were used to prepare optimal formulations for extrusion. The resulting extrudates' resiliency, bulk density and thermal conductivity were within the range of commercially available foamed plastics. Viscosity measurements were performed on the formulation producing the lowest bulk density. Rheological flow curve for this formulation depicted pseudoplastic type behavior indicating it has flow properties similar to both starch and plastic polymer.
Library of Congress Subject Headings
Plastics -- Extrusion
Plastics -- Biodegradation
South Dakota State University
Raghavachari, Sampath, "Processing and Testing of Corn Based Foamed Plastics" (1994). Electronic Theses and Dissertations. 49.