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A survey of different theories of non-Newtonian intrinsic viscosity is given. Only the Gaussian coil has been treated up till now so that all results apply only to ideal solutions, that is, to solutions at Flory's θ point. Perfectly flexible coils without hydrodynamic interaction yield a constant intrinsic viscosity, . The same applies to the case with hydrodynamic interaction when its change with coil deformation in flow is neglected. Anisotropy of hydrodynamic interaction, partial coil rigidity, and the change of hydrodynamic interaction with coil deformation individually yield an initial drop in intrinsic viscosity proportional to the square of the gradient. In the last case the gradient dependence can be calculated over the whole range of gradients. Intrinsic viscosity first decreases to a minimum, then rises again, eventually above the initial value, and reaches a limit nearly corresponding to that of similar rigid, rod-like particles at maximum orientation.
Wayne State University, Detroit, Mich.