Abstract
The concentration fluctuations of poly(acrylamide) (PAAm) hydrogels prepared at different preparation temperatures, Tprep's, have been studied by dynamic light scattering (DLS). The ensemble average light scattered intensities obtained at the scattering angle of 90°, 〈I〉E, was decomposed into two contributions: one from the static inhomogeneities, 〈IC〉E, and the other from thermal fluctuations, IF. Contrary to the case of poly(N-isopropylacrylamide) (PNIPAm) gel, 〈I〉E was a decreasing function of Tprep. This indicates that these gels have opposite Tprep dependence with respect to the static inhomogeneities. However, the liquidlike properties of these gels, such as IF and the cooperative diffusion coefficient, D, were found to be independent of Tprep, as they should be. It was also found by DLS and swelling experiments that, unlike PNIPAm gels, PAAm gels prepared by redox polymerization were subject to hydrolysis and changed to partially charged gels.
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