| Abstract: | Poly(acrylic acid) networks swollen with water and having different ionization degrees and different polymer concentrations, were investigated using elastic and quasi-elastic light scattering. The scattered intensity was found to vary as the ratio of the polymer concentration to the ionization degree, which shows that the osmotic pressure is dominated by counterion entropy. The behavior of the cooperative diffusion coefficient cannot be explained by the scaling theories and involves an unexpected variation of the frictional coefficient with polymer concentration. |
