Comb-Shaped Polystyrenes 57 perturbation produced by the individual bead is the same in both chains. Some support for this argument is provided by the fact that the intrinsic viscosities of the dimer and the 16-mer both tend to be low or high in the same solvents (e.g., low in DMSO, THP, and methanol and high in water and 6 M urea), indicating that the solvent-solute interactions are similar for the short and the long chain. Thus although the absolute level of intrinsic viscosity may be difficult to interpret in terms of the hydrodynamic specific volume of the oligomer, the ratio DjWfaL may be taken as a measure of the relative chain expansion in a given solvent.

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