Abstract

The excess thermal noise generated during capillary flow of polymer solutions has been studied in detail for solutions of poly(ethylene oxide) of varying concentrations in water, and for constant concentration in various solvents (mixtures of water and isopropyl alcohol). The excess noise level, which increased with flow rate, was found to be a linear function of the dimensions of the polymer coils obtained from intrinsic viscosity data. Results obtained with different solvents and concentrations show that the excess noise depends on both the concentration and the solvent system. The noise power seems to be closely connected with the entanglement density in the system, expressed as the degree of overlapping of the macromolecules, or the correlation length, i.e., the mean distance between two points of entanglement.

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