A coarse-grained (CG) model of NPs-based PNCs is adopted, which is presented in Figure . We model each polymer chain as a completely flexible and linear chain composed of M=30 beads (below the entanglement regime) where each bead represents a cluster of monomers. Each nanoparticle (NP) is modeled as a sphere with 1 bead. The diameter and mass are set to be  and m for polymer beads while that of NP beads are 4  and 64m, respectively. Each PNCs system contains Npolymer = 1000 polymer chains and NNP=240 NPs. The nonbonding potential Uij is described with the modified Lennard Jones (LJ) potential: