Damping of acoustic waves in dilute polymer solutions

Details Damping of acoustic waves in dilute polymer solutions Damping of acoustic waves in dilute polymer solutions

2004-07-27

arxiv.org/abs/cond-mat/0407698v2

Macromolecules 37, 8195 (2004)

Physics

Condensed Matter

Soft Condensed Matter

5 pages

Scientific paper

10.1021/ma048486h

The shear viscosity eta_s(w) of dilute polymer solutions (of flexible coils) has been classically measured and interpreted in terms of the Zimm modes. We point out that the longitudinal viscosity eta_l(w) is the sum of two components eta_l=4*eta_s/3+eta_p, where eta_p is due to an effect of pressure on the coil size. We discuss eta_p for a crude model involving a dependence of both the Kuhn length a and the Flory parameter chi on pressure. We find that eta_p is comparable to eta_s for good solvent conditions, but that eta_p should dominate over eta_s near the theta point.

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