Two classes of nanocomposites involving polymers and magnetic particles or silica were synthesized and characterized. Effect of polymer on the morphology of the composites and the matrix filler interactions were studied in detail. Different analytical tools were used to characterize these composites and show a core-shell structure for the novel nanocomposites reported in this paper. TEM studies on these composites gave particle size distribution in nanometer range. The morphology and size of the particle changed significantly with the polymer used.