We employ all-atom molecular dynamics simulations up to microsecond time scales to study
diffusion of fullerene nanoparticles (C60 and its derivative PCBM) in a polyimide matrix
above its glass transition temperature. A detailed examination of the fullerene mobility in the
embedding polymer system reveals the presence of different diffusion regimes (ballistic,
subdiffusive, and normal diffusive). The microscopic origin of the observed subdiffusive
regime is discussed by comparing the behavior to the one displayed by different anomalous …