Solution properties of near-monodisperse poly(a-methylstyrene) chains in the moderate solvent n-butyl chloride were investigated by a combination of static and dynamic light scattering and intrinsic viscosity measurements. These data allow the determination of the radii of gyration (Ro) as well as equivalent sphere radii: the hydrodynamic radius (RH), the viscometric radius (Rv), and the thermodynamic radius (RT) (defined below). Ratios of these various radii allow a comparison between solution properties of poly(amethylstyrene) in n-butyl chloride and those of other polymer/solvent systems, as well as with theoretical predictions. Whereas RG/RH values are intermediate, as expected, between those normally found in good solvents or at the 8 state, the average value of Rv/RH = 1.186 is substantially larger than that commonly found for other chains in solvents of varying thermodynamic quality. Unusually large values of Rv/RH were also recently reported for the related system, polystyreneln-butyl chloride. Such a dependence of RvIRH on solvent quality (larger values in thermodynamically moderate solvents) has not been previously noted or predicted by theory.

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