Abstract
Sedimentation velocity measurements on moderately concentrated solutions of linear and four-branched star polystyrenes at both good (benzene) and theta (cyclohexane) solvent conditions are reported. The branched p′ lystyrenes show a different sedimentation behaviour than the linear ones. If, for instance, s 0 s is plotted versus c[η] the resulting curves for the branched polystyrenes are significantly steeper than the corresponding curves for the linear samples, both at good and theta solvent conditions. The difference in sedimentation behaviour between linear and branched polymers is further elucidated by utilizing the permeability concept and the scaling law hypothesis.
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