Inelastic light scattering by gel modes in semi-dilute polymer solutions and permanent networks at equilibrium swollen state

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Abstract
The cooperative diffusion constant, determined from light scattering experiments on polymeric networks swollen in a good solvent, varies with equilibrium concentration according to a scaling law similar to that observed in semi-dilute solutions. This result implies that the average distance between adjacent crosslinks of the network is equal to the screening length. This assumption, supported also by compressional modulus data, allows us to reconsider the real structure of polymeric networks and in particular to consider the influence of entanglements trapped during the gelation process