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The effect of starch volume fraction on starch-filled poly(hydroxy ester ether) (PHEE) biodegradable composites was analyzed using Mooney, Thomas, Maron & Pierce, and kankel & Acrivos equations. Corn starch/PHEE materials were extruded using a twin-screw extruder with starch volume fractions from 0.27 to 0.66. The starch was dried to a moisture content of 0.7Oh to minimize moisture effect on composite rheology. Dynamic fresuency sweep measurements were canied out at 120°C and 104 strain. The equations of Maron & Pierce, Thomas, and Frankel & Acrivos can be used to describe the experimental data. It is found that the relative viscosity at the same shear stress increases with increasing shear stress. The possible existence of yield stress at high starch concentrations was examined using a Casson plot.

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