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Samples of poly(styrene−diphenylethylene) copolymers of narrow molar mass distribution were studied by molecular hydrodynamic methods. The values of velocity sedimentation coefficient, frictional ratio, translational diffusion coefficient, and intrinsic viscosity were measured in toluene. It is shown that the method of velocity sedimentation, coupled with the numerical solution of the Lamm equation (Sedfit program), can be considered as an absolute method of molar mass determination. The correlations between the hydrodynamic values and the molar mass were obtained. A new Multi-HYDFIT program was applied to obtain the conformational parameters of poly(styrene−diphenylethylene) copolymer chains unaffected by intrachain excluded volume effects.

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