Table 2. One possible reason the great increment of mechanical properties of the nanocomposite is silica as a result of a stiffness material, the addition of silica can strengthen the mechanical property of the system. Besides, the hydroxylated silica, acting as the larger obstacles, cause stronger mechanical interlockings between the silica and the polymer molecules, which consequently prohibit the polymer chains to rotate and slip. As a result of the higher steric barrier of hydroxylated silica breaks in these system,