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Static and dynamic light scattering were measured for monodisperse polyethylene oxide) (PEO) in water and methanol at 25 °C. PEOs of three different molecular weights ranging from nominal Afw = 2.6 X 104 to 9.96 X 10s were used. For all of these molecular weights, angular dependence of Zimm plots showed no downturn at low angles not only in water but also in methanol, indicating no large aggregates of PEO in both solvents. Furthermore, apparent weight-average molecular weight " , radius of gyration Rgapp-and hydrodynamic radius Rhm did not change over 3 weeks. This observation indicates that molecularly dispersed PEO is stable and aggregate-free property is inherent in these solvents.

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