Abstract:A method is proposed for the determination of average molecular weights and molecular weight distributions of polymeric materials from sedimentation equilibrium experiments in theta solvents. The data required are the refractive index gradients at the center of the ultracentrifuge cell as a function of a parameter λ = (1—v̄ρ0) (r22—r12)ω2/2RT; here v̄ is the partial specific volume of the polymer solute in the given solvent, ρ0 is the density of the solvent, ω is the rotor speed, r1 and r2 are the radial dista… Show more
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