Abstract
Using a single experimental approach, namely dynamic light scattering in polyacrylamide and fibrin gels, the fluctuation dynamics of polymer gels was studied for the first time in parallel at two scales. One scale is congruent with gel network macrostructure, and another is microscopic at this level. Long-period fluctuations of the network structure with characteristic times in the range ~10–70 min have been detected, during which the microdynamics of network fibers remains practically unchanged in the range 0.1–106 μs. The limits of applicability of the “frozen” inhomogeneities approximation widely used in studying gels microdynamics have been established. The approach developed forms a basis for extending the range of investigations of polymer gel dynamics.
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