Friction coefficients in self‐diffusion, velocity sedimentation, and mutual diffusion for poly(ethylene oxide) in aqueous solution

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Abstract
The concentration dependences of the friction coefficient(s) for poly(ethylene oxide) have been determined on well‐defined fractions in dilute aqueous solution. Three independent techniques have been used: FT‐pulsed field gradient NMR (self‐diffusion), photon correlation spectrosccpy (mutual diffusion), and velocity sedimentation, in the concentration range 1‐25 kg m−3. The results establish that, at a given concentration, the friction coefficient in self‐diffusion is appreciably smaller than that operating in mutual diffusion and sedimentation; the friction coefficient in the latter processes are identical within experimental error.