The diffusion characteristics of spherical solute in the network of polymer gel were studied based on the three-dimension network model of gel

in which the effect of the interaction between the solute and fibers of gel was taken into account.It was found that the movement of solute in gel is quite different from the Brownian movement in free solution.The difference increased with the solute size.A Significaut effect of the interaction between solute and gel fiber on the movement of solute molecule was also observed.Attraction and repulse both hindered the diffusion obviously.Decreasing the size of the solute and increasing the interaction would enhance the hindering effect markedly.