A new procedure for the determination of the molar mass distribution of polymers in solution from sedimentation equilibrium
A new method for the evaluation of multimodal molar mass distributions W(M) from sedimentation equilibrium measurements of polymers in solutions is proposed. The methods is based on the determination of the experimental measured reduced concentration profile (interference optic) or reduced concentration gradient profile (Schlieren optic) by extrapolation to zero concentration, and subsequent direct calculation of the molar mass distribution by nonlinear regression of the integral equation. The procedure is tested with different polystyrenes and sodium polystyrene sulfonate.
Key wordsUltracentrifuge sedimentation equilibrium molar mass distribution polymer solutions
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