Abstract
In this paper, we report the viscoelastic properties of sodium polystyrene sulfonate (NaPSS) solution with different concentrations (in the range of 10<sup>-4</sup> M to 10<sup>-3</sup> M) and with different molecular weights (70 kDa vs. 200 kDa) investigated via Diffusing Wave Spectroscopy (DWS). The viscoelastic properties of the sample solutions are characterized in terms of the elastic modulus G' and the viscous modulus G" as a function of frequency (f), and also in terms of the polymer disentanglement time (τ); the effect of polymer concentration and molecular weight on these parameters are presented. Our experimental results indicate that (1) both the viscous modulus G" and the disentanglement time (τ) increase with molecular concentration, whereas the elastic modulus G' is relatively insensitive to molecular concentration, and (2) for the same concentration, all the 3 parameters (i.e., the elastic modulus G', the viscous modulus G", and disentanglement time τ) increase as the molecular weight increases.
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