The dynamic of confined polystyrene in nanoparticles was investigated in particles as small as 42 nm in the close packed morphology. The relaxation time was extracted from the dynamic of closure of voids between close packed particles. The particles deform under the effect of the surface tension energy (polystyrene/air), and the deformation is probed via small angle neutron scattering. Both the shift factor and relaxation time of the confined PS were found to follow a bulk dynamic between bulk T-g and T-g -50 degrees C, for particles as small as 42 nm. This data was interpreted to indicate that cooperativity resulting from the contacts between particles inhibits the eventual activation of the surface dynamic.