Organic electronics require solution-processed polymer/nanoparticle composites. The kinetics of polymer and nanoparticle behavior in solution effect the processing conditions needed. While the aggregation of C60 nanoparticles in toluene has been studied, only recently was it observed that there is a simultaneous swelling of the polystyrene chains. Solutions of polystyrene and C60 in toluene exhibit kinetic effects at two distinct length scales: chain swelling of the polymer (~1-4 nm) and aggregation of C60 NPs (~ 1 micron). Understanding the relative rates of these two phenomena is necessary for determining the mechanism of chain swelling. We propose to use SANS to quantify the kinetics of polystyrene chain swelling in toluene solutions with varying concentrations of C60. A control set of aged solutions will be used to determine the equilibrium state for each sample. Structure factors for polystyrene, measured using SANS, will be compared to optical, static- and dynamic- light scattering measurements for the kinetics of C60 aggregation. By quantifying the kinetics on both length scales, we hope to probe the interplay between chain swelling and C60 aggregation.