Because the molecular chain length of the PDMS used in this study was ~250 nm, the formation of a random-coiled structure can involve the conformational rearrangement of large spatial regions on the interface, compared to the local segmental substitution of charge-dipole interaction. The time required to move a molecular segment in a bulk viscous flow depends on its travel distance, and the rearrangement of such a large region will be significantly retarded by the bulk viscous flow. Therefore, it is reasonable that the time required for random-coiling can be much longer than that for the substitution of the charge-dipole bond, and that bulk viscosity becomes the rate-limiting mechanism for the entire reaction of the disappearance of layered structure.