The compatibility of PMMA and starch cinnamate (STCN) blends prepared in tetrahydrofuran, 1,4-dioxane, and N,N-dimethylformamide has been examined through viscometry at 30 degreesC. From the intrinsic viscosity, relative viscosity, reduced viscosity, and density measurements, the blends of the two polymers were observed to be compatible in all three solvents. The compatibility of the blends was also confirmed through FTIR and SEM studies. The blends were observed to be compatible on the basis of heat of mixing, but they were observed to be incompatible an the basis of polymer-polymer interaction parameters. Results obtained show that the compatibility predicted on the basis of viscometric and density measurements is not affected by the choice of solvents. Biodegradation studies showed 13% weight loss within 120 days in the case of the blend containing 30% STCN.