SCREENED HYDRODYNAMIC INTERACTIONS IN TERNARY POLYMER-SOLUTIONS

This paper discusses the effects of screened hydrodynamic interactions in ternary polymer solutions. The inclusion of a screening length xi(H) in the Oseen tensor allows a good description of the wavevector dependence of the relaxation frequencies characterizing the mixture. In the limit of infinite screening length xi(H) --> infinity, the full hydrodynamic interaction is recovered whereas for infinitely short length xi(H) --> 0, the Rouse behavior is obtained. The method can be applied to arbitrary mixtures but for simplicity it is presented here in the symmetrical case.