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Dilute Solution Properties of Monodisperse Poly(α-methylstyrene). II. Hydrodynamic Properties in Good Solvents

Hydrodynamic properties of monodisperse poly(α-methylstyrene) were studied in dilute benzene solutions, both concentration and molecular weight being varied. Molecular weight determination was performed by three methods, osmometry, light scattering and sedimentation equilibrium. The intrinsic viscosity was found to be [η]=(1.034±0.05)×10−4M0.72 dl/g at 30°C, where M is the molecular weight. The sedimentation coefficient extrapolated to zero concentration and one atmosphere was found to be s0°=(3.61±0.03)×10−15M0.43 sec. The Scheraga-Mandelkern constant β was evaluated as (2.43±0.03)×106 which was independent of M and in agreement with the value previously obtained in theta solvent. The concentration dependence of sedimentation coefficient was found to be compatible with the recent theory by Pyun and Fixman.